CN1055033A - Drag analysis method - Google Patents
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- CN1055033A CN1055033A CN91101224A CN91101224A CN1055033A CN 1055033 A CN1055033 A CN 1055033A CN 91101224 A CN91101224 A CN 91101224A CN 91101224 A CN91101224 A CN 91101224A CN 1055033 A CN1055033 A CN 1055033A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/035—Fishing for or freeing objects in boreholes or wells controlling differential pipe sticking
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/14—Methods or devices for cementing, for plugging holes, crevices or the like for cementing casings into boreholes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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Abstract
A kind ofly be used for drilling difficult wellhole and can avoid the method for planning repeatedly and monitoring of unnecessary risk or cost, replace single-point appraisal, this method that the multiple point value probability appraisal of indicator based on the various possible drilling problems of possible drillng variable is provided.Desired drillng variable changes in pratical and feasible boundary also repeatedly estimates corresponding indicator value.Each probability value of estimating then be used to calculate do not wish the likelihood of the indicator of condition.If do not wish that the probability of condition is unacceptable during the value of overstepping the extreme limit, the adjusting measure then is provided, and reappraises probability after the adjusting.If the change back pointer changes inessential then this drillng variable of cancellation in the analysis in future.
Description
The present invention system is about the equipment of boring method and control boring method, more particularly, the invention provides in the probing of extending the well that puts in place and the complete process and reduces the method for blocking drilling pipe danger.
Many underground natural resources, can no longer use the boring method exploration of beating peupendicular hole from ground such as oil-bearing structure, have on platform or " island " that very long non-perpendicular or sloping portion extends to well location and the well that gets out is very common now, typically, sloping portion is positioned near under the initial point (top) of vertical component, Offset portion can have the angle of slope that can reach 90 degree (promptly being bordering on level) for vertical component, and the sizable distance of top cross ground skew is left in the shaft bottom as a result.
Modern technologies almost can be with the wellhole at any inclination angle, but present drilling well (comprise and finishing) method runs into many problems in long high off normal wellhole, the middle sleeve that for example turns round enters great growth that some high off normal wellhole may cause towrope resistance (promptly, the high-drag wellhole), this will cause before arriving predetermined required tubing depth and block the sleeve drill set, if can not provide enough additional forces (up or down) so that block loosening, in fact the result will lose this mouthful well, maybe can become flexible even avoided blocking, overcoming the required power of high towrope resistance also may the major injury pipe fitting.
For avoiding the problem in these drilling wells of not expecting, the indicator of these aspects then is used for predicting and/or monitoring, for example, the lift of the weight of required bearing sleeve drilling tool (i.e. supporting or indication are thought highly of) is not equal to the actual weight of sleeve drill set, a part is by due to the drag force in the wellhole, and drag force (if enough big) just can cause that sleeve blocks.When in wellhole, turning round, actual weight is the indication that drag force and sleeve block trend with respect to the plussage of indication weight (power that supporting sleeve is required), employed bit speed and moment of torsion when other widely used drag force associated indicator comprises rotary drilling.Other problem, some needs in high off normal drilling well in advance emphasizing, comprises that circulating loss, drill set structural deterioration, direction are lost partially, the segregation of concrete destruction, vapour phase/low concentration material and containing and the wellhole cleaning.In drilling well, other indicator of these or others problem is still arranged, comprising: the return rate of mud, Pressure, Concentration, Temperature; Slush pump pressure; Drilling prospection; Used moment of torsion; Cutting speed; Drill set weight; Quantity with regeneration recovery cutter.
If utilize indication, then can obtain to alleviate the various solutions of these risks.For example, the method for slowing down of high drag force both can be 1) increase downward power, or 2) reduce friction factor, for example wellhole is lubricated and regulates.
Yet it is generally speaking both expensive and actual effect is limited that these slow down regulation scheme.For example, on drilling tool pipe group, can only add limited downward power.The excessive downward force that surpasses safety margins will make drill set be bent, and also can continue to increase drag force (if in high off normal wellhole lateral support being arranged) or cause structural deterioration (if laterally will not support).In addition, intensified pressure drilling well downwards will be unpractiaca or make equipment hoisting/pipe fitting play the liter weight limit to be exceeded.
Similar various limitations affect existing friction factor reduce all methods of (that is, lubricated, the aperture is regulated, or reduces drag force).When lubricated pipe fitting group enters in the overhanging well that puts in place, even lubricated drill set also will finally produce unacceptable big drag force, because friction only is to have reduced and not elimination.The geometry of some wellhole and the borehole wall (that is, inner surface) condition is even there is lubricated drill set also can produce resistance (high drag force) situation that more increases in the upright opening part of short inclination.
Many many drillng variables that can greatly influence the drilling technology process and other factors, when drilling well and the operation of pipe fitting (be the sleeve pipe running or engages) and associative operation, may the fierceness variation.For example, at any time, drag force can be calculated by actual torque and taking the weight of data pointer, but that the two all changes is very fast.These indicators depend on many drilling wells (comprising deck) variable or other factors.Though some variable is relatively constant and is known (such as the rigidity of tube section), and other (such as friction factor) then be fast-changing, be uncertain.These uncertain variablees that changing and factor also comprise the wellhole cross-sectional geometry, the contact of drill set flange, keyway effect, cutting nature of ground, the differential pressure effect, angle of slope, contact surface, the fluid power viscous drag, drilling tool pommel shape, mud particle composition and knuckle place rigidity situation etc.
Basic analytical method in advance is to be used to plan out acceptable, a promptly possible successful drilling program.Desired drillng variable data are used in foretells a probable value to the indicator under each unfavorable situation.If (for example indicator weight) some prophesy value (in drilling process) of indicator drops on acceptable or " normally " boundary outside, then plan and/or provide measure correct or that relax.If mitigating measures is planned out or is provided, then to make the prophesy second time of unique probable value be acceptable with the prophesy value that demonstrates each indicator to the indicator of the drillng variable value that each use has been regulated now.
In drilling well (and finishing) operating process, basic monitoring formula technology obtains drilling well indicator (obtaining some drillng variables simultaneously) data, and these reality or real time supervision value and desired or limiting value are compared.If the value of overstepping the extreme limit or real data are in outside " normally " scope, controller will obtain warning against danger, to use other boring method (adjusting measure).Can also comprehensively predict and monitoring method by the increment benchmark for example a kind of diverse ways for each resource area or structure.
A kind of as in US Patent No 4,791, the statistics approximatioss described in 998 was known already.It at first needs to demonstrate the well data (that is, indicator data and other factors) of dividing into groups in the situation similar drilling well of not expected that for example drilling tool pipe group is blocked from first cover.Need simultaneously the second cover well data, it does not expect on the other statistics of the similar drilling well of operating mode significant group from not demonstrating yet.Analyzed a new well of resource has the drillng variable of data earlier with respect to two covers and has foretold which group the new well expectation of this resource falls into this method statistic.If expect bad condition to occur, then should provide the adjusting measure to approach towards the second cover numerical value to change drillng variable.
These methods will cause the drilling mode of three kinds of forms, and all these three kinds of modes all cause cost prohibitive.Because can not handle intrinsic not the affirming and the factor that changes such as conditions down-hole economically.First kind of mode, or undue conservative mode, the problem of using unnecessary adjusting measure to avoid not conference to take place (i.e. the limiting value of too guarding indicator is shown potential problems are arranged and send rub-out signal and often adopt the adjusting measure).Unless there is the material risk of generation problem, it is not effectively using the cost of adjusting measure.
For unnecessary delay/inefficacy of using a kind of effective or correct adjusting measure in case of necessity, sometimes then be the catastrophic effect of the undue second way of taking a risk, it ignored do not expect that (be that the limit indicator value has only just been sent problem signals after the problem of height risk exists the great opportunity of operating mode, except some false alarms, often do not use the adjusting measure).If exist the great risk of generation problem, then need take immediate steps and regulate, rather than after problem is come to the surface.The expensive effective adjusting measure of the early stage step of drilling well plan may not be effective afterwards.
Last a kind of mode among the three, or statistical risk analytic approach, balance the relation between the risk of cost and aforementioned two methods, but need the data of expensive complete drilling well success or failure, to support statistical model.Yet the statistical technique of being emphasized in all cases, even if when obtaining enough data, can not avert failure or have unnecessary adjusting measure reliably, and for exploration drilling, also may can not get enough statistics.
For put in place the mining type of well of extension, need a kind of analytical method of simplification, it can provide expensive adjusting measure necessarily or bear unnecessary risk, and this mode does not need too much data yet.
The invention provides that a kind of interactional that the resource well uses imitateed for boring, plan and indicator monitoring technology, it can be avoided, and unnecessary data is collected, unnecessary adjusting measure and hasty risk.Replace single-point prediction (based in the prediction of this point or around its drilling well decision-making of " normally " value) drillng variable in practicable scope of statistics network analysis or each indicator that displacement takes place or move producing one group of indicator value of predicting, each all has its chance accordingly separately.If the prediction chance of the arbitrary numerical value that oversteps the extreme limit is unacceptable, then the drilling well plan should be revised.Because those influences the little variable of indicator even after mobile, then limit variable is recognized soon deletion.In imitation, plan and the monitoring in future, can ignore them relievedly.Point to the early stage selection of adjusting measure of the economy of limit variable and also give implementation, and incur loss through delay or go to select the adjusting measure with the mode of approaching that is not inconsistent theoretical curve.The present invention will be particularly useful for the wellhole of drilling condition under the mal-condition or off-design and high inclination.
Fig. 1 is the schematic diagram on the typical missile silo of expression road;
Fig. 2 is illustrated in the simple two-dimensional force diagram on the drilling tool pipe fitting of the sloping portion of Jing Lu as shown in fig. 1;
Fig. 3 be for the friction factor that Jing Lu shown in Figure 1 partly accompanys or follow change calculate and the curve map that dies down of weight;
Fig. 4 be expression when use heavier drilling well extract the hole when giving in the well road shown in Figure 1 by the friction factor that changes calculate the weight distribution curve figure that makes sediment incipient motion;
Fig. 5 represents when operation sleeve pipe feasible possible curve map that weakens with weight during in Jing Lu part shown in Figure 1;
Fig. 6 finishes the technology of this processing step and the block diagram of equipment; And
In these figure, should be understood that identical digitized representation components identical or feature.
Brill extends the well that puts in place can increase the drag force on the pipe fitting in the wellhole.This drag force system is owing to the danger that can take place to block in wellhole produces.The invention provides a kind of risk analysis method, with assessment with alleviate excessive drag force and other danger, particularly for the extension well that puts in place.
Fig. 1 illustrates put in place the missile silo road simplified schematic diagram of well of a kind of extension of recommending out.
As an example, the initial part 2 of wellhole is under ground 3, and the predetermined axis that the near vertical of actual measurement (vertically) degree of depth 243.8 meters (800 Foot) is arranged, and second or the direction of built-up section 4 change wells.The tiltangle (see figure 2) is approximately the ratio of per 30.48 meters (100 Foot) 3.5 degree, up to fathom (the measuring along wellhole from ground) that arrive 950.7 meters (3119 Foot).The 3rd or sloping portion 5 locate to extend to the shaft bottom from measuring the degree of depth (being length) 950.7 meters (3119 Foot).In wellhole, record from ground to the distance in shaft bottom, or TMD (just as shown in fig. 1 " TMD point ") is expected to be 4032.2 meters (13229 Foot).Actual total vertical well depth (" TVD ") and lateral displacement (" lateral displacement ") are predefined for 1210 meters (3970 Foot) and 3467.4 meters (11376 Foot) respectively.Initial drilling well plan is estimated to drill and sleeve pipe at " TMD point " with the drilling tool pipe group of several different nominal diameters.Other drillng variable of this example is then listed in the following table 1.
Table 1 is the example of the drillng variable value of the well recommended:
*The angle of slope of Offset portion=81.17 degree
*Drill set and head: what 31.1 centimetres (12 1/4 inch) initial nominal diameter continued is 21.6 centimetres of (8 1/2 inch) nominal diameters
*Sleeve: 50.8 centimetres of (20 inch) nominal diameters to 235.2 meter (775 Foot) are located, 34.0 centimetre (13 3/8 inch) nominal diameter is located to fathom 1829 meters (6000 Foot), 24.4 centimetres of (9 5/8 inch) nominal diameters to 2956.6 meter (9700 Foot) and 17.8 centimetres of (7 inch) nominal diameters are located up to 4032.2 meters (13229 Foot).
*The feasible region of the opening friction factor of institute's phase: 44.5 centimetres of (17 1/2 inch) nominal drilling tools and head=0.30 are to 0.80 in 44.5 centimetres of (17 1/2 inch) apertures; 34.0 centimetres of (1.3 3/8 inch) nominal sleeve pipe=0.40 are to 0.70 in the aperture of 44.5 centimetres (17 1/2 inch); 31.1 centimetres of (12 1/4 inch) nominal drilling tools and head=0.25 are to 0.70 in 31.1 centimetres of (12 1/4 inch) apertures; 24.4 centimetres of (9 5/8 inch) nominal sleeve pipe=0.35 in the aperture of 31.1 centimetres (12 1/4 inch) are to 0.60; 21.6 centimetres of (8 1/2 inch) nominal drilling tools in 21.6 centimetres of (8 1/2 inch) apertures and head=0.35 are to 0.85; And in 21.6 centimetres of (8 1/2 inch) apertures 17.8 centimetres of (7 inch) nominal sleeve pipe=0.30 to 0.80
*The friction factor that in sleeve pipe, records: 31.1 centimetres of (12 1/4 inch) nominal drilling tools and head=0.2 in 34.0 centimetres of (13 3/8 inch) nominal sleeve pipes; 24.4 centimetres of (9 5/8 inch) nominal sleeve pipe=0.33 in 34.0 centimetres of (13 3/8 inch) nominal sleeve pipes; 21.6 centimetres of (8 1/2 inch) nominal drilling tools and head=0.31 in 24.4 centimetres of (9 5/8 inch) nominal sleeve pipes; And 17.8 centimetres of (7 inch) nominal sleeve pipe=0.35 in 24.4 centimetres of (9 5/8 inch) nominal sleeve pipes.
Fig. 2 represents that the wellhole part 5(that tilts with 7 one-tenth tiltangles of vertical direction sees Fig. 1) in act on simple two-dimensional force diagram on the drilling tool pipe fitting 6.When drilling well and running sleeve pipe enter when extending in the well that puts in place, towrope resistance will be serious problems, if when particularly well goes beyond the limit of the drag force angle.Limit drag force angle is defined as tube elements or single pipeline section no longer because of gravity angle to lower slider in wellhole, promptly must be afterburning or push away downwards in wellhole in order to overcome towrope resistance.When the part of Jing Lu surpass one of this limiting angle long apart from the time, will produce the enough big resistance counteracting resulting gravity of cornue road part that do not overstep the extreme limit.When this kind situation took place, drilling tool pipe (being whole pipe fittings and section part) then no longer slided in well.
The weight of floating of pipe fitting 6 acts on vertically downward the direction 7.The representation in components of this gravity is that normal force 8(is promptly perpendicular to the wall portion direction of angled section 5) and axially or lateral force 9, axial force 9 makes pipe fitting be tending towards gliding on the wellhole part 5 that tilts.The normal force component 8 of this gravity also produces resistance 10, and it is the function of (with respect to the pipe fitting direction) normal force and work friction factor.When the angle of slope when 90 degree increase, normal component of force 8 increases, and axial thrust load reduces.For certain friction factor and angle of slope, i.e. limit angle of slope, friction factor takes advantage of normal force (being drag force 10) then to equal axial force 9.Friction factor is 0.2, and then limit angle of slope is 78.7 degree.Similarly, if friction factor is 0.3,0.4 or 0.5, then limit angle of slope is respectively 73.3,68.2 and 63.4 degree.
Fig. 3 represents to use the example of most preferred embodiment method, in calculated Jing Lu (being shown in Fig. 1) the nonrotational operation of nominal 17 1/2 inch wellholes parts or dropout weaken interim, in order to the minimizing of the expection of calculating taking the weight of or indicator weight.Usually indicator weight is the no any power that makes progress such as buoyancy in wellhole and drag force of weight (promptly equipment heavily adds the weight that makes up pipeline section) of the drilling cramp of supporting drill set and drilling equipment.Installation weight (the initial support weight when promptly not having pipe fitting) also should reduce to be beneficial to the control to the drilling equipment taking the weight of as much as possible.
Wellhole partly extends to fathoming of 6000 Foot.Because the work friction factor is uncertain, unless 0.3 to 0.8 feasible region shown in the table 1, a series of taking the weight ofs (being condition indicator) prediction will be drawn as Fig. 3.Because almost all feasible friction factor all is difficult to slide (being that the angle of slope goes beyond the limit of tiltangle), even provide than the adjusting measure of low friction coefficient and use lower friction factor similarly, work will still need apply additional load with in the wellhole that forces the downward entry altitude skew of drill set.Almost the required indicator load of each shift value in feasible friction factor scope is all shown the height possibility of pipe group obstruction and other problem.If initial drilling well plan is implemented, then need to indicate additional load.
The heavier drill set (as the wellhole epimere 2 among Fig. 1) of a kind of use is selected with the low-cost regulation scheme that increases load-carrying with influencing each other.Now, similar in appearance to initial drilling well plan, the drilling well plan that will have this kind regulation scheme medelling and give analysis in addition.Maybe need the adjusting measure that adds as long as can obtain acceptable success sign, this second pattern and displacement are analyzed and can be determined.
Fig. 4 be illustrated in revise drilling well plan (gaining in weight) afterwards make the sediment incipient motion operation time the curve map of second kind of analysis of indicator weight.A kind of heavier top wellhole drilling pipe (for example the drilling pipe that wall is thicker is placed in the vertical component of wellhole at least) is used for just intending to be used for assistance work near peupendicular hole road part (being shown in Fig. 1) is existing, but impost also can influence conversely and makes the sediment incipient motion operation.The friction factor quilt of institute's phase again increment type is shifted so that analyze.
Because the pipe fitting working limit, rig can maximum apply 1,556 on support column, 800 newton's (350,000 pounds) pulling force.Analyzing shape is similar to put in place the drilling well plan of (now gaining in weight) of well of the extension shown in Fig. 1 and shows that the weight increase will can not make the working limit at the rig middle sleeve be exceeded.Fig. 4 shows and makes sediment incipient motion operating period at various different depths and consider under the situation of friction factor and move the heavier required power estimated value of drill set.
Surpass 0.7 if the mobile friction factor figure among Fig. 4 expresses friction factor, then the limiting value of safety or drilling cramp/pipe fitting restriction (lifting capacity limit) has surpassed the value obtained in the bottom.Though it is present 20% that unlikely hope surpasses 0.7 to 0.8 friction factor, generally also may be no more than present 10%.
The likelihood of estimating not is inessential.In addition, promote the direct investment effect of load and drilling well frame/pipe fitting limit problem for height, each load also is related to other problem or the operating mode do not expected (for example, drill set is blocked, or drill set damage and incur loss through delay/can not change the drilling well frame) possibility.Especially, as shown in Figure 4, the high friction factor above 0.7 causes promoting current heavier drill set safely, and they are in the bottom or near the bottom, unless use frame/pipe fitting that big ability is arranged that high pipe fitting working limit is arranged.
Though these possibilities are less when facing, when not being unessential chance analysis result, three kinds of schemes are arranged substantially.First scheme is to accept 10% to 20% risk to carry out drilling well, and during drilling well no any change or special monitoring plan.For example, if risk is enough little and multiple well is used in plan, there are the bigger drilling well frame of ability of higher working limit pipe fitting and/or hollow well to make that like this risk program is acceptable for adopting.
Alternative plan is to carry out drilling well and concrete monitoring (lifting) indicator weight.Actual monitoring weight with compare at the friction factor curve (being shown in Fig. 4) of different depth, immediate curve then is determined.If monitoring (actual) indicator gravimetric value is near showing that friction factor is 0.7 or a bigger curve, when drilling well, the drilling well plan will be carried out such as the correction that reduces the angle of slope.Approach for the second time and reduced risk, this reduction, the indicator that is related to monitoring how can demonstrate effectively earlier do not expect the risk on the horizon of working condition and effectively the adjusting measure after drilling well begins, just give and providing.
If the risk of being reluctant to accept to reduce already, third party's case are to revise drilling technology with further reduction risk before drilling well.For example, a kind of co-pending patent application S/N 07/401 that is shown in U.S.'s application on August 31st, 1989,086, this quote its in full as a reference drilling well lubricated slurry or float-up device can be used for reducing even eliminate Offset portion in wellhole and act on drag force on the pipe fitting.
In this example, adopt third party's case.That is to say, each subject matter unlikely but quite significant probability, even it is monitored (in this example in indicator weight, estimate to be no more than 10%), if the friction factor of this unlikely appearance is considered to be unacceptable, also can be accompanied by sizable cost and impact, need do further modification in the works in drilling well.
The method of using well-regulated and lubricating is selected already as the adjusting measure.These adjusting measures of further estimating have greatly reduced friction factor and have surpassed 0.7 possibility.Along with estimating in the wellhole of lubricated/adjusting, to use heavier drill set, further reuse the displacement analytic process.This just is that 0.7 prediction probability has been reduced to an acceptable level with friction factor, if particularly when drilling well (alternative plan) indicator weight be monitored to.If actual (monitoring) indicator reclosing is near or to surpass be 0.7 to calculate the prediction that gets and make sediment incipient motion or weaken value prior to the actual well drilled operation to friction factor, then should not take the adjusting that adds and/or lubricated levelling measure with further reduction friction factor rapidly, not then reduce the likelihood of problem.
Fig. 5 show in initial weight of equipment, predict with may reduce indicator (in this case, be to weaken operating period) curve map of weight, be in the part of Jing Lu for the double adjusting plan of the nominal sleeve pipe of running 34.0 centimetres (13 3/8 inch) (strengthen weight with lubricated/regulate drilling well) situation.Most possible or prediction on average weaken function that supporting (indicator) weight is the degree of depth and desired average friction factor 0.45 is represented with the chain-dotted line curve.Now, desired or " normal direction " friction factor has fallen within 0.4 to 0.5 the narrow range, as shaded area among Fig. 5, have only now very little near or surpass 0.5 possibility.As calculated, friction factor is bordering on 0.5, exist near the bottom little, but the likelihood of acceptable problem when drilling well (if monitor).If the work friction factor is near 0.5, monitoring and the estimation range that operation indicator is weighed with feasible curve more then are expected to find out earlier potential problem, can take to make the more effective further adjusting measure of cost earlier.In addition, 44.5 the actual friction factor (being gone out by data computation obtained in the drilling well) of centimetre (17 1/2 inch) wellhole probing also can be used for revising the numerical value of each expectation of various likelihoods and other friction factor, can be arranged so that necessary adjustment measure to be provided the additional time.For each sleeve and drilling well work, can make the similar director curve figure under the various feasible friction factor conditions.For intending drilling well, before the opposite result of the drillng variable of unlikely other or indicator demonstrates unacceptable risk, also can take other adjusting measure.
It is the buoyancy that increases on the pipe fitting that acts on the offset well position that another kind is specially adapted to extend put in place the possible adjusting measure of well, as the common unsettled U. S. application of all quoting at this as a reference, series number 07/401,086, shown in 31 days Augusts in 1989 of the applying date.If selected this adjusting measure, then recommend other displacement analytic approach.
As discussed above, the likelihood of given friction factor depends on many drillng variables, but some unique drillng variable is not always to need.If enough data are arranged, this method most preferred embodiment can directly be judged the likelihood of indicator.Likelihood evaluation/the estimation of other indicator (or drillng variable) can be at areal, there are the drillng variable data of similar architectonic existing similar well to be the basis, or a kind of based on the imaginary substantially relevant calculating that influences the drillng variable of indicator.This other evaluation can be comprehensive US Patent No 4,791, and discuss in advance the 998(front) statistical analysis approach with probable shift calculation and interactional drilling well plan modification technology of the present invention and form.
Drillng variable is the comprehensive of drillng variable factor such as a kind of account form of work friction factor.The work friction factor is the experience factor that comprises many factors that work separately.The factor that these work separately, such as " real friction " factor, keyway factor, flange factor, cutting mineral deposit factor, quilt such as spherical factor of drill bit and difference viscous factor integrate to calculate total or the friction factor of working.In the correlative factor of these drilling well work frictions each all changes, and generally is uncertain, but can it be combined in the feasible scope with analytic approach theory and/or experience, and relevant with indicator weight.
For the configuration of a certain certain well and relevant with the work friction factor important or limit drillng variable can be determined by the displacement in its actual feasible region or to the interference of each drillng variable.If work friction factor and/or problem indicator do not play much effects to the feasible region of drillng variable, then this variable can be fixed or calculate at from now on displacement friction factor and taking the weight of indicator in the operation such as monitoring and ignored.Most important limit variable also can be used as to be had the variable of maximum efficiency and determines work friction factor or problem indicator.If calculate by high friction factor cause do not wish the unacceptable high likelihood of operating mode, then should at first consider to influence the adjusting measure of the low-cost of these limit variablees.
Finishing the processing step of an embodiment of the method and the block diagram of equipment is shown among Fig. 6.Data collection module " A " is to be in the electronic communication equipment that has converter or other input equipment.The significance level of practicable scope (if can accomplish), variable and the indicator of original expectation numerical value, drillng variable, variable and the indicator of the relation between drilling well planning data, the regulation scheme of not expecting operating mode, variable and the indicator, indicator and indicator likelihood threshold value then be added in the module " A ".This modular device is typical digital device and microprocessor, but may comprise also that also the input of manual keyboard data is provided with." normally " of indicator or initial numerical value of wishing are to be calculated by drilling well plan and desired drillng variable, rather than directly import.In other words, any feasible prediction of indicator all can be used when initial.If other specific input is not provided, this module also can be fallen into a trap from existing average drillng variable or defective numerical value and be calculated initial indication.
If calculating shows do not chosen in advance or afferent module B, then a desirable variable (also can be indicator) is chosen, and variable will be changed or be shifted according to the data that offer module " A " in module B.Displacement can be a plurality of increments displacement in whole (but generally being therein) feasibility scope, this possible range be input or calculate from the data that provide by module " A ".Best direction of displacement is the direction towards the likelihood increase of the undesirable result/indicator that maybe can not receive.If the direction of displacement towards unacceptable result is not obvious, promptly accuses towards the displacement at the two ends of feasible region and to finish.
Module " B " can be the part of module " A " microprocessor, also can be an independent calculation element.The counting of selector marker or variable also can be kept in module " B " device, and reaches the module of back.
Increment shift value from module " B " is transferred into module " C ", and the probability of each shift value of the selected there or indicator that calculates is determined.For example, the probability that depends on displacement friction factor and other drillng variable and factor (being input to module " A ") at the probability of the indication weight of given depth.The calculating of module " C " is used in shift value (being finished by module " B ") and the input module " A " and is distributed with selected and the various drillng variables of the probability displacement indicator or the probability of other various factors that calculate variety of issue or unacceptable drilling well result.
Module " C " is also compared the probability of selected displacement indicator with the indicator threshold value with by the more important value that module " A " is sent.The comparison means of module " C " can be independently a matrix or a comparator, but also can be the part of the aforementioned microprocessor of module " A ".If comparison shows that probability do not surpass calculated or by the big level (being common result) of module " A " input, then indicator cancellation in module " E ".If counting shows the reservation indicator that is not shifted, then in module " A " selection other with the indicator and the drillng variable that are shifted, till all critical indicator and variable are all analyzed.If an indicator is not an end that is arranged in the worst case scope of module " D ", then in module " B ", realize the further displacement (other displacement increment) of indicator/drillng variable, be positioned at up to indicator till the worst end of feasible region.
If do not wish that the condition indicator probability has surpassed the acceptable limit in the module " C ", then in module " F ", select a regulation scheme.Module " F " is selected and can manually be finished, (the pattern promptly influences each other) plan that also can prelist, and a series of drilling wells adjusting measures can be worked out plan and be input in the module " A ".Produce the drilling well plan of revising by module " A ", and be admitted to module " B ", selector marker is counted zero setting again, and process repeats to be no more than the limit up to displacement indicator probability.
Bigger variation is arranged and be lower than this threshold value if the indicator of the displacement of calculating or the probability of variable demonstrate than the limit of not expecting operating mode, then the variable of Xuan Zeing (or indicator) is transfused in the module " G ", if other non-displacement indicator keeps, then repeat from the initial process of module " A ".In addition, module " D ", " E ", " F " and " G " can be the parts of total microprocessor, also can be independent comparator/messaging devices.
If there is not other indicator to keep, then carry out drilling well work, indicator and each variable that monitoring simultaneously keeps.Variation with data monitored input module " A " information processing/drilling well plan now then continues as previously discussed.If they are no longer feasible or be of great importance for the result's who is not expected probability when drilling well for some indicator, drillng variable and drilling plan, then can or not consider by zero setting.For example, when near the shaft bottom, using the pipe fitting that increases the weight of then no longer is a kind of scheme of economy.
If regulation scheme is not preliminary election, the regulation scheme of selecting to keep in module " F " then is similar to aforesaid risk analysis step and analyzes, and effect that it is desired based on importing (with its probability) is based on indicator or variable.Finishing the critical indicator/variable that will keep in module " F " compares for institute's phase effect of each scheme on these numerical value.(analysis) be selected and be tested to each regulation scheme also can by its order that increases cost.
The present invention allows exploring, producing, log well, make oil well to continue to adopt in produce oil or the shut-in well activity best drilling well plan and operation.When enough data or analyze to allow and when the cost reasonable drilling can be provided with monitoring, can ignore unnecessary indicator or variable (for example, even under the most abominable situation the variable of the much risks of also unlikely introducing) relievedly.
Although imagination indicator and drillng variable all were independently during discussed the front.If dependency relation is known, relevant variable also is provided, for example friction factor depends on the composition of drilling fluid, rotary speed or degree of depth variable.These are concerned input module " A " and the indicator/variable that is shifted in module " B ", so just associated indicator/variable is shifted simultaneously.Follow-up mensuration had independently also considered to be shifted the relevant variable and the effect of indicator with more both having considered to be shifted.
May have other embodiment.They comprise: the microprocessor of a set associative; In conjunction with heuristic (promptly reviewing one's lessons by oneself) algorithm, in repeated use to determine scope, increment and each likelihood value; In the drilling process based on variable drilling well and other input data, the important and limiting value in module " A " can change; Replace the microcomputer step and microcomputer is installed in the down-hole in the shell of protection is arranged with artificial calculating.This device and process also can be used for excavating, cutting a hole tunnel, remote control subaqueous construction or other various application that a plurality of variable/indicators arranged and have the place of quite big uncertainty.For example, the danger of coming down in the mining process is then relevant with wall slope geometry, tamped strength and other variable.This method will make these relations and primary data input, and at desired these numerical value of scope internal shift, the importance of emanating out and each variable.With result and limiting value relatively, and interrelatedly select landslide adjustment measure to bring the low and rational excacation of cost of risk.
Realize drilling well and finish put in place the method for well of extension being disclosed in following paper already and having suffered, by M.D.Mueller, J.M.Quintana and M.J.Bunyak propose in the 22nd the coastal waters technology annual meeting of holding in the Houston May 7～10 nineteen ninety is entitled as " shell soot shape (Irene) platform extends the drilling well that puts in place from wriggling ".Its purport has selected for use conduct with reference to file at this.
Though the present invention's's (prediction and the method for monitoring taking the weight of in the wellhole of offsets in height) most preferred embodiment illustrated already and gave and having described, also illustrate and/or described the embodiment that some has changed, still can make various variations and correction without departing from the invention.Correspondingly, be intended to all these changes, correction and alternate embodiment are contained among the present invention, make among its spirit and scope that falls into the attached all claims in back.
Claims (25)
1, a kind of control method that likelihood ratio is controlled at the probability limiting value that the generation of drilling tool pipe group is blocked in subterranean well technology, this method with the prediction taking the weight of of drilling tool pipe group as an indicator, choking phenomenon will take place if indicator surpasses a limiting value, wherein taking the weight of depends on that has the uncertain friction factor that probability distributes in pratical and feasible scope, and this method comprises:
A. select a predetermined friction factor value, and calculate its rear section taking the weight of value in drilling technology, the predicted value of this taking the weight of is at least in part based on this predetermined friction factor value;
B. in practicable scope, change selected friction factor value and calculate at least in part taking the weight of changing value based on the friction factor that changes;
C. changing value and the threshold value with taking the weight of compares;
D. if the changing value of taking the weight of greater than threshold value, calculates greater than threshold value and at least in part based on the risk probability value of the taking the weight of of the variation of the friction factor that changes;
If e. risk probability value surpasses the probability limit, then revise drilling technology to reduce above-mentioned risk probability calculated value and repeating step a to d.
2, the method described in claim 1 is characterized in that: available subjective judgement is calculated above-mentioned risk probability value.
3, a kind of control method that in technology thereafter, the likelihood of operating mode is controlled to a probability limit, said method uses a value of a kind of possibility indicator of above-mentioned working condition at least, when above-mentioned indicator value exceeds a threshold value, wherein above-mentioned indicator value is uncertain and has the probability of non-zero that this method comprises in the indicator value scope:
A. will obtain an indicator value of representing a kind of factor at least in part at least, this factor may influence above-mentioned working condition in above-mentioned technology thereafter;
B. in the scope of above-mentioned indicator value, above-mentioned indicator value is changed over the first change indicators value;
C. above-mentioned first change indicators value and above-mentioned threshold value are compared;
If d. above-mentioned first change indicators (value) surpasses above-mentioned threshold value, then calculate at least in part first probability based on the above-mentioned change indicators value of the above-mentioned non-zero probability of above-mentioned indicator value;
If e. above-mentioned first probability surpasses the above-mentioned probability limit, then revise above-mentioned subsequent technique and repeating step a to d.
4, the method described in claim 3 is characterized in that: above-mentioned working condition be do not expect that and the above-mentioned variation of the above-mentioned first change indicators value is the higher end of possibility towards the above-mentioned operating mode of generation of above-mentioned feasible region.
5, the method described in claim 4 is characterized in that: described subsequent technique is that the step that well bore obtains above-mentioned indicator value comprises:
At least obtaining one represents and can influence above-mentioned the initial drillng variable value of not expecting the physical factor of working condition; And
Calculate above-mentioned one at least in part based on the indicator value of one of above-mentioned initial drillng variable value.
6, the method described in claim 5 is characterized in that above-mentioned conversion step comprises:
In pratical and feasible scope, change at least one variate-value for the first time for above-mentioned variable, above-mentioned first changes the more above-mentioned initializaing variable value of variate-value more near an end of above-mentioned variable feasible region, and wherein above-mentioned first changes the non-general likelihood ratio that the variate-value representative will take place; And
Calculate at least in part the first change indicators value that changes variable based on above-mentioned first.
7, method as claimed in claim 6, it is characterized in that it also comprises: f. changes above-mentioned at least one drillng variable numerical value in pratical and feasible scope basically for the second time, above-mentioned second changing value has non-general generation likelihood, and more above-mentioned initial value and above-mentioned first changing value are farther from an above-mentioned end of above-mentioned feasible region;
G. calculate second indicator value that changes;
H. calculate at least in part the second probability value based on the indicator value of above-mentioned second variation of above-mentioned second variate-value that changes;
If the i. above-mentioned second probability value surpasses the above-mentioned probability limit, then revise drilling well; And
J. the drillng variable repeating step a that uses above-mentioned correction is to i, till above-mentioned probability value is no more than the above-mentioned probability limit.
8, the method described in claim 7 is characterized in that said method has used the level of the importance values that above-mentioned indicator is changed, and said method also comprises the following steps:
K. calculate the indicator value that increases progressively based on the difference of above-mentioned first change indicators value and above-mentioned predetermined indicator value;
L. the above-mentioned indicator value that increases progressively is compared with above-mentioned importance values level;
If the m. above-mentioned indicator value that increases progressively that compares equals or exceeds above-mentioned importance values, then repeating step a is to l;
If the n. above-mentioned indicator value that increases progressively that compares is no more than above-mentioned importance values, then cancels above-mentioned indicator, and use other indicator repeating step a to i.
9, the method described in claim 8 is characterized in that only after the variation, just finishing above-mentioned cancellation step at above-mentioned indicator in its most of feasible four corner.
10, the method described in claim 9, a part that it is characterized in that above-mentioned wellhole is drilled with certain angle of slope, above-mentioned drillng variable is a friction factor, above-mentioned indicator is many taking the weight of values that depend on drilling depth, the above-mentioned operating mode of not expecting then is that drilling tool blocks, and it also comprises the following step:
O. during above-mentioned drilling well, monitor above-mentioned actual taking the weight of value;
P. calculate the friction factor of revising, it will make above-mentioned actual taking the weight of value approach the above-mentioned working condition of not expecting; And
Q. revise the above-mentioned prediction of above-mentioned friction factor based on above-mentioned correction.
11, the method described in claim 10 it is characterized in that above-mentioned friction factor is to be made of n resistance pertinency factor, and each above-mentioned resistance pertinency factor all influences a plurality of relevant indicators, and wherein said method also comprises the following step:
R. change in the above-mentioned resistance pertinency factor at least, and
S. calculate at least in part changing value based on an above-mentioned associated indicator of the resistance pertinency factor of above-mentioned change.
12, the method described in claim 11 is characterized in that it also comprises the following steps:
Determine the increment of the above-mentioned variation of at least one above-mentioned indicator t. exploratoryly; And
Determine the feasible region of at least one above-mentioned indicator u. exploratoryly.
13, a kind of drilling equipment that in continuous drilling well, limits the likelihood ratio of the working condition of not expected with the probability limit that the maximum conditions indicator value is arranged, it comprises:
Be used for getting out the drilling tool of wellhole;
During with above-mentioned drilling tool drilling well, obtain at least one do not expect the device of the predictive indicator value of working condition;
The numerical value of above-mentioned fallout predictor indicator is become the device of the indicator value of variation;
The device that the indicator value of above-mentioned variation is compared with above-mentioned limiting value;
If the indicator value of above-mentioned variation surpasses above-mentioned limiting value, calculate the device of probability of the indicator value of above-mentioned variation;
If above-mentioned probability surpasses the above-mentioned probability limit, revise the device of above-mentioned drilling well.
14, the equipment described in claim 13 is characterized in that said apparatus is comprehensively in the chip microprocessor of an above-mentioned drilling tool of control.
15, a kind of method for digging that limits the excavation result's who is not expected likelihood, this method use a kind of depend on be unwilling to the determining cause number the limiting value of expected result indicator not, this be unwilling to have its probability to distribute in pratical and feasible scope by the determining cause number, and this method comprises:
A. in above-mentioned scope, select one may factor value, and calculating the first predetermined indicator value during its rear section based on above-mentioned method for digging that may factor value at least in part;
B. in above-mentioned scope, select the unlikely factor value of a likelihood ratio, and be calculated to the unlikely predetermined indicator value of small part ground based on above-mentioned unlikely factor value less than above-mentioned possibility factor value;
C. with above-mentioned unlikely predetermined indicator value and above-mentioned threshold;
If d. unlikely predetermined value is greater than this threshold value, then calculate greater than at least in part based on the risk probability value of the taking the weight of of the variation of the limit of the friction factor that changes; And
If e. risk probability value surpasses the probability limit, then revise method for digging with the risk probability value that reduces aforementioned calculation and repeat each step from a to d.
16, in activities, prevent that the method for unacceptable likelihood ratio value from appearring in the result, said method uses the indicator value of the calculating of the indicator relevant with The above results at least in part and has the threshold indicator value of the likelihood ratio of minimum acceptable The above results, wherein above-mentioned indicator value depends on a certain factor value that be unwilling to the determining cause element at least in part, this factor equals minimum likelihood ratio at least in the factor value scope, this method comprises:
A. calculate in above-mentioned scope first indicator value based on first factor value;
B. obtain in above-mentioned scope, be not equal to second indicator value of above-mentioned first factor value based on second factor value again;
C. with above-mentioned second indicator value and above-mentioned threshold ratio;
If d. above-mentioned second indicator value surpasses above-mentioned threshold value, then calculate at least in part indicator likelihood ratio value based on the above-mentioned second factor value likelihood ratio;
E. above-mentioned indicator likelihood ratio value is compared with above-mentioned acceptable likelihood ratio value; And
F. if above-mentioned indicator likelihood ratio value is equivalent to above-mentioned unacceptable likelihood ratio value at least, then revising above-mentioned technology becomes the technology of having revised.
17, the method described in claim 16, it is characterized in that said process is a kind of drilling process, it uses the equipment of supporting tubular member weight so that carry out drilling well and finish it by means of operation pipe fitting and adjusting pipe fitting in above-mentioned wellhole, wherein above-mentioned makeover process has reduced probability, and above-mentioned indicator likelihood ratio value is equivalent to above-mentioned unacceptable likelihood ratio value at least.
18, the method described in claim 17, wherein above-mentioned wellhole comprises non-perpendicular part, wherein the technology of above-mentioned correction has increased the buoyancy that acts on the pipe fitting.
19, the method described in claim 18, it also comprises:
G. will be above the indicator likelihood ratio value addition of above-mentioned unacceptable likelihood ratio value; And
H. further revise above-mentioned drilling process based on above-mentioned summation.
20, the method described in claim 19 is characterized in that above-mentioned indicator is relevant with the taking the weight of of above-mentioned pipe fitting.
21, the method described in claim 20 is characterized in that above-mentioned factor is with relevant at total friction factor that above-mentioned above-mentioned pipe fitting in service stood.
22, the method described in claim 21 is characterized in that above-mentioned threshold value is the maximal support weight of above-mentioned drilling equipment.
23, a kind ofly prevent from activities to surpass the method for the unacceptable likelihood ratio value of the limit as a result, it used relevant with The above results at least in part reach depend at least in part be unwilling to the determining cause element be unwilling to decide indicator, this method comprises:
A. select the threshold indicator value that an indication does not surpass the acceptable result limit;
B. obtain the likelihood ratio of above-mentioned first factor value that be unwilling to the determining cause element in each value scope;
C. calculate one group of above-mentioned indicator numerical value above-mentioned at least in part based on the activities of above-mentioned first factor value;
D. with each indicator numerical value of aforementioned calculation and above-mentioned threshold ratio;
If the indicator value of above-mentioned arbitrary calculating or approximately approximate above-mentioned threshold value at least greatly e. greater than above-mentioned threshold value or neither one aforementioned calculation indicator value, obtain the likelihood ratio of above-mentioned in the above range second factor value that be unwilling to the determining cause element and make it approximately to be not equal to above-mentioned first factor value, and replace above-mentioned first factor value with above-mentioned second factor value;
F. up to the indicator value of aforementioned calculation both no longer greater than or roughly equal to repeat c when above-mentioned threshold value also no longer is no above-mentioned other value that be unwilling to the determining cause number in the scope of the above-mentioned indicator value that can produce the calculating that approximates above-mentioned threshold value each go on foot to f;
If g. the indicator value of aforementioned calculation is at least about equaling but be not slightly larger than above-mentioned threshold value, calculate at least in part indicator threshold likelihood ratio value based on the above-mentioned first factor value likelihood ratio;
H. above-mentioned indicator threshold likelihood ratio value and above-mentioned unacceptable likelihood ratio value are compared, and
If i. above-mentioned indicator likelihood ratio value is at least about above-mentioned unacceptable likelihood ratio value, then above-mentioned process modifications becomes the technology of correction.
24, method as claimed in claim 23 is characterized in that it also includes the following step:
J. the technology with above-mentioned correction replaces above-mentioned technology; And
K. repeat a to each step of h, till above-mentioned indicator value is slightly less than above-mentioned unacceptable likelihood ratio value.
25, the method described in claim 24 is characterized in that it also comprises the following step:
L. in the activities of above-mentioned correction, if above-mentioned indicator value approximates above-mentioned unacceptable likelihood ratio value then monitors above-mentioned indicator;
If m. each monitor value of above-mentioned indicator is suitable with described calculated value in the activities of above-mentioned correction, then further revise above-mentioned technology first value.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US48631290A | 1990-02-28 | 1990-02-28 | |
| US486,312 | 1990-02-28 | ||
| US56038090A | 1990-07-31 | 1990-07-31 | |
| US560,380 | 1990-07-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1055033A true CN1055033A (en) | 1991-10-02 |
Family
ID=27048641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN91101224A Pending CN1055033A (en) | 1990-02-28 | 1991-02-28 | Drag analysis method |
Country Status (6)
| Country | Link |
|---|---|
| CN (1) | CN1055033A (en) |
| AU (1) | AU7348291A (en) |
| IE (1) | IE910209A1 (en) |
| MY (1) | MY104760A (en) |
| OA (1) | OA09343A (en) |
| WO (1) | WO1991013237A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105143598A (en) * | 2013-02-27 | 2015-12-09 | 兰德马克绘图国际公司 | Method and system for predicting drilling events |
| WO2023033788A1 (en) * | 2021-08-30 | 2023-03-09 | Landmark Graphics Corporation | Determining parameters for a wellbore plug and abandonment operation |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9621871D0 (en) * | 1996-10-21 | 1996-12-11 | Anadrill Int Sa | Alarm system for wellbore site |
| WO2005091196A1 (en) * | 2004-03-17 | 2005-09-29 | Schlumberger Holdings Limited | Method and apparatus and program storage device adapted for visualization of qualitative and quantitative risk assessment based on technical wellbore design and earth properties |
| US7653563B2 (en) * | 2004-03-17 | 2010-01-26 | Schlumberger Technology Corporation | Method and apparatus and program storage device adapted for automatic qualitative and quantitative risk assessment based on technical wellbore design and earth properties |
| US7630914B2 (en) | 2004-03-17 | 2009-12-08 | Schlumberger Technology Corporation | Method and apparatus and program storage device adapted for visualization of qualitative and quantitative risk assessment based on technical wellbore design and earth properties |
| EP1918869A1 (en) * | 2006-11-02 | 2008-05-07 | Abb Research Ltd. | Dynamic safety balance monitoring |
| CN107995983B (en) | 2015-03-06 | 2022-05-06 | 哈佛蒸汽锅炉检验和保险公司 | Risk assessment for drilling and completion operations |
| US11514527B2 (en) | 2017-07-27 | 2022-11-29 | The Hartford Steam Boiler Inspection And Insurance Company | Computer systems and computer-implemented methods utilizing sensor-driven dynamically adjustable feedback loops to manage equipment based risk on an asset specific level of energy data usage |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU608503B2 (en) * | 1985-07-15 | 1991-04-11 | Chevron Research And Technology Company | Method of avoiding stuck drilling equipment |
| US4760735A (en) * | 1986-10-07 | 1988-08-02 | Anadrill, Inc. | Method and apparatus for investigating drag and torque loss in the drilling process |
-
1991
- 1991-01-22 IE IE020991A patent/IE910209A1/en unknown
- 1991-02-08 OA OA59946A patent/OA09343A/en unknown
- 1991-02-19 WO PCT/US1991/001080 patent/WO1991013237A1/en not_active Ceased
- 1991-02-19 AU AU73482/91A patent/AU7348291A/en not_active Abandoned
- 1991-02-26 MY MYPI91000310A patent/MY104760A/en unknown
- 1991-02-28 CN CN91101224A patent/CN1055033A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105143598A (en) * | 2013-02-27 | 2015-12-09 | 兰德马克绘图国际公司 | Method and system for predicting drilling events |
| WO2023033788A1 (en) * | 2021-08-30 | 2023-03-09 | Landmark Graphics Corporation | Determining parameters for a wellbore plug and abandonment operation |
| US11761298B2 (en) | 2021-08-30 | 2023-09-19 | Landmark Graphics Corporation | Determining parameters for a wellbore plug and abandonment operation |
| GB2623254A (en) * | 2021-08-30 | 2024-04-10 | Landmark Graphics Corp | Determining parameters for a wellbore plug and abandonment operation |
Also Published As
| Publication number | Publication date |
|---|---|
| OA09343A (en) | 1992-09-15 |
| AU7348291A (en) | 1991-09-18 |
| WO1991013237A1 (en) | 1991-09-05 |
| MY104760A (en) | 1994-05-31 |
| IE910209A1 (en) | 1991-09-11 |
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