EP3698015B1 - System und verfahren zur reinigung eines ringförmigen bereichs in einem bohrloch - Google Patents

System und verfahren zur reinigung eines ringförmigen bereichs in einem bohrloch Download PDF

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Publication number
EP3698015B1
EP3698015B1 EP18867925.2A EP18867925A EP3698015B1 EP 3698015 B1 EP3698015 B1 EP 3698015B1 EP 18867925 A EP18867925 A EP 18867925A EP 3698015 B1 EP3698015 B1 EP 3698015B1
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EP
European Patent Office
Prior art keywords
holes
annulus
pipe body
sets
well
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EP18867925.2A
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English (en)
French (fr)
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EP3698015A2 (de
EP3698015A4 (de
Inventor
Morten Myhre
Arne Gunnar Larsen
Arnold ØSTVOLD
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Hydra Systems AS
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Hydra Systems AS
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Publication of EP3698015A4 publication Critical patent/EP3698015A4/de
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Classifications

    • 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
    • E21B37/00—Methods or apparatus for cleaning boreholes or wells
    • E21B37/08—Methods or apparatus for cleaning boreholes or wells cleaning in situ of down-hole filters, screens, e.g. casing perforations, or gravel packs
    • 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
    • E21B37/00—Methods or apparatus for cleaning boreholes or wells
    • 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
    • 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
    • E21B43/11—Perforators; Permeators
    • 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
    • E21B43/11—Perforators; Permeators
    • E21B43/114—Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets

Definitions

  • the invention concerns a system and a method of cleaning an annular area in a subterranean well, for example in a production well or an injection well.
  • the invention may be used in context of plugging such a well, for example for plugging and abandoning (P&A) the well temporarily or permanently.
  • P&A plugging and abandoning
  • the present system and method is used in a well section containing a first pipe body surrounded by a second pipe body so as to form a pipe-in-pipe constellation.
  • a first annulus is located between the pipe bodies and contains a substantially clean fluid, whereas a second annulus outwardly surrounds the second pipe body and contains contaminants in a solid, semi-solid or liquid state, or a mixture thereof.
  • the second annulus is located between the second pipe body and a surrounding borehole wall formed through subterranean formations (rocks).
  • the second annulus may be located between the second pipe body and one or more progressively larger pipe bodies located external to the second pipe body, each of these larger pipe bodies also having an annulus external thereto that is likely to contain such contaminants.
  • the noted contaminants may comprise various particles, debris, deposits and/or well fluids, for example filter cake, formation particles, drill cuttings, drilling additives, e.g. barite, cement particles and/or residues and old drilling fluids (or similar), that have settled out or remain in the second annulus from previous well operations.
  • the above-described pipe-in pipe constellation and annular content situation may exist in a production well containing an inner production tubing surrounded by a production casing or liner, or in an injection well containing an inner injection tubing surrounded by an injection casing or liner.
  • the inner tubing generally extends between the surface and a permeable zone of the well and is used to convey fluids out of the well (production) or into the well (injection).
  • the so-called Perf-Wash-Cement method (“PWC ® " and "PWC, Perf-Wash-Cement ® ”) has, since about year 2010, gained increasing interest and use in the oil and gas industry as a very efficient and environmentally safe method of plugging wells. Contrary to the section milling techniques, the PWC ® method does not require one or more pipe bodies (e.g. casings, liners) to be milled away and removed before placing a plugging material (e.g. cement) in an entire cross section (rock-to-rock) of a well.
  • a plugging material e.g. cement
  • One or more pipe bodies (casings/liners) located within a well section are instead perforated to gain access to one or more outwardly surrounding annuli. These perforations or holes are generally formed simultaneously, or substantially simultaneously, through the wall(s) of the one or more pipe bodies.
  • a perforating gun is typically used to do so, although other suitable perforating devices also may be used for this purpose.
  • contaminants such as those described above, are typically present in such annuli and must be removed before placing the plugging material in the well section.
  • a washing or jetting tool is therefore inserted into the (innermost) pipe body to wash away and remove contaminants present along the perforated section of the well.
  • a washing fluid is discharged from the washing or jetting tool and flows through perforations previously formed in the one or more pipe bodies, thereby cleaning away contaminants present in the one or more surrounding annuli.
  • the washing or jetting tool is typically moved down and then up along the perforated section during a washing operation, although washing only in one direction may prove sufficient.
  • a suitable fluidized plugging material is then introduced in the (innermost) pipe body and is placed along the perforated and cleaned section, thereby forming a cross-sectional (rock-to-rock) barrier in the well. Cement slurry is typically used for this purpose, although other types of plugging materials may also be used.
  • WO 2012/096580 A1 discloses the PWC ® method in general and more specific terms.
  • This publication describes embodiments of a washing tool generally referred to as the HydraWash TM washing tool in the oil and gas industry.
  • This washing tool may comprise spaced apart and radially extending flow guides which, in operation, cooperate with an inside of a casing to form a confined pressure compartment enclosing a limited number of holes in the casing.
  • a washing fluid is supplied to the confined pressure compartment via a suitable work string extending to surface, for example a jointed pipe string (e.g. a drill string) or a coiled tubing string.
  • the washing fluid which is located within the compartment, is then directed outward through the limited number of holes in the casing so as to clean away contaminants in an annulus surrounding the casing.
  • the HydraWash TM washing tool is generally disclosed for use in a single casing, and for washing and cleaning in a single annulus external thereto.
  • WO 2013/133719 A1 discloses a more specific variant of the PWC ® method.
  • the PWC ® method is used to form a cross-sectional plug in a well section containing at least two substantially concentric pipe bodies (e.g. casing strings) having at least two corresponding annuli external thereto (i.e. a pipe-in-pipe constellation).
  • the washing operation is carried out using a washing tool generally referred to as the HydraHemera TM jetting tool in the oil and gas industry.
  • the jetting tool is typically connected to a work string extending to surface, for example a jointed pipe string or a coiled tubing string.
  • the jetting tool also features a plurality of outlets, e.g. nozzles, angled at different angles.
  • a flushing fluid discharges at high velocity from the differently angled outlets so as to produce flushing jets directed in different directions relative to a longitudinal axis of the pipe bodies.
  • the angled flushing jets therefore penetrate holes formed in the pipe bodies and enter the surrounding annuli from different directions.
  • the flushing jets gain better access to the annuli and contaminants therein so as to effectively dislodge and remove the contaminants within the annuli.
  • the noted holes are typically of a relatively large size.
  • the holes used with the HydraHemera TM jetting tool may have a diameter in the order of 20-35 millimetres, which is substantially larger than the hole diameters, typically in the order of 8-15 millimetres, commonly used with the HydraWash TM washing tool in a single casing setting.
  • WO 2013/133719 A1 there is no disclosure in WO 2013/133719 A1 about an inner annulus containing a substantially clean fluid and (only) an outer annulus containing contaminants to be removed therefrom, which is quite contrary to the starting point of the present invention.
  • WO 2016/200269 A1 discloses yet another variant of the PWC ® method used for plugging and abandoning a well.
  • the noted HydraHemera TM jetting tool is typically used in a well setting with a single pipe string having only one surrounding annulus, which contains contaminants to be removed therefrom. This is also a different starting point than that of the present invention.
  • the primary object of the present invention is to provide a cleaning technology for removing contaminants in an annulus outwardly surrounding two pipe bodies arranged in a pipe-in-pipe fashion and having an intermediate annulus containing a substantially clean fluid, which is defined herein as a fluid being substantially devoid of flow-inhibiting contaminants, as explained in further detail below.
  • a further object of the present invention is to provide a useful alternative to the above-described prior art variants of the PWC ® method.
  • the present invention comprises a system for cleaning an annular area in a well, characterized in that the system comprises:
  • the present invention employs a washing tool resembling the HydraWash TM washing tool disclosed in e.g. WO 2012/096580 A1 .
  • the present pipe constellation resembles the multiple casing (and annuli) setting disclosed in e.g. WO 2013/133719 A1 , where the HydraHemera TM jetting tool is used for simultaneous cleaning in multiple annuli.
  • the present invention employs a HydraWash TM type of washing tool in a HydraHemera TM type of well setting, i.e. in a setting with multiple pipes and multiple annuli (pipe-in-pipe constellation).
  • the present invention exhibits distinct differences relative to the technologies disclosed in the noted prior art publications.
  • a set of holes is defined herein as a first hole formed through the tubular wall of the first pipe body, wherein the first hole is aligned substantially in a radial direction with a second hole formed through the tubular wall of the second pipe body, which surrounds the first pipe body.
  • the plurality of sets of holes are dispersed in a substantially regular fashion along the longitudinal section, for example having a substantially even distance between (spacing) and number per unit length (density) of sets of holes along and around all or part of the longitudinal section.
  • the sets of holes may be formed simultaneously, or substantially simultaneously, through the wall(s) of the pipe bodies.
  • the clean fluid present in the first annulus between the first and second pipe bodies is defined as a fluid being substantially devoid of contaminants of the above-mentioned types.
  • the clean fluid could comprise a common completion fluid, typically a type of brine, or seawater, diesel or similar.
  • Such clean fluids, e.g. completion fluids, would be familiar to the skilled well practitioner.
  • first pipe body would typically comprise a production tubing or an injection tubing
  • second pipe body would typically comprise a production casing or liner, or an injection casing or liner.
  • present invention would also be applicable with other types of pipe bodies, e.g. various casing/liner sizes, and other types of pipe-in-pipe constellations, e.g. casing-in-casing or liner-in casing constellations.
  • a pressurized washing fluid When operating the present system, a pressurized washing fluid is supplied to the confined pressure compartment.
  • the pressurized washing fluid then discharges from the confined pressure compartment as high velocity flushing jets passing through respective radially aligned holes of the limited sets of holes, which are located within the confined compartment.
  • the flushing jets also pass through the clean fluid present in the first annulus. Owing to lack of flow-inhibiting contaminants in the clean fluid, a significant amount of kinetic energy is preserved in the flushing jets when entering the second annulus, which allows the flushing jets to engage and clean away contaminants located in the second annulus.
  • the contaminants may be removed via other holes located along the longitudinal section, and via the first pipe string and/or the first annulus. It is therefore conceivable that the contaminants may be conducted to the surface of the well for removal. Alternatively, the contaminants may be deposited deeper in the well or may even be injected (i.e. "bullheaded") into a deeper formation in the well.
  • the washing tool may be connected to a lower end of a suitable tubular work string for operation of the washing tool.
  • the work string may, for example, be a jointed pipe string (e.g. a drill string) or a coiled tubing string extending to the surface of the well for supplying a pressurized washing fluid to the confined pressure compartment during operation of the present system.
  • a suitable downhole pump to be connected to the confined pressure compartment for supplying pressurized washing fluid thereto.
  • the sets of holes may have a hole diameter in the order of 2-15 millimetres. More particularly, the hole diameter may be in the order of 2,5-10 millimetres. Still more particularly, the hole diameter may be in the order of 2,5-7 millimetres.
  • the density of sets of holes along and around all or part of the longitudinal section may be in the order of 30-80 sets of holes per meter, more particularly in the order of 50-70 sets of holes per meter, for example 60 sets of holes per meter.
  • the flow guide spacing (distance between the flow guides) may be in the order of 10-45 centimetres (4-18 inches), more particularly in the order of 15-35 centimetres (6-14 inches), for example 30 centimetres (12 inches).
  • a perforating gun which is furnished with shaped explosive charges capable of generating narrow and long perforations, so-called production perforations, through the first and second pipe bodies, is considered to be appropriate for making such hole sizes in the pipe bodies.
  • the hole diameters employed herein would generally be smaller than the hole diameters typically used with the noted HydraWash TM washing tool.
  • the generally smaller hole sizes used in the present sets of holes allow the smaller holes to function as nozzle-resembling outlets similar to those embodied in the noted HydraHemera TM jetting tool.
  • the present sets of holes are not angled as in the jetting tool and instead extend in a substantially radial direction relative to a longitudinal axis of the pipe bodies. In operation, when the washing fluid in the confined compartment is pressurized sufficiently, the limited number of holes within the confined compartment therefore discharge high velocity fluid jets capable of penetrating through the substantially radially aligned holes of both pipe bodies and into the second annulus to facilitate cleaning therein.
  • the first hole in the first pipe body has a different diameter than the diameter of the second hole in the second pipe body.
  • the first hole may have a smaller diameter than the diameter of the second hole, which would provide easier access for the fluid jets into the second annulus.
  • one or more sets of holes at a bottom part of the longitudinal section have a hole diameter being larger than the hole diameter of said majority of sets of holes. Larger holes at the bottom part of the longitudinal section may prove advantageous for facilitating subsequent displacement of a fluidized plugging material into the first and second annuli, as specified below in an embodiment of the present method.
  • one or more sets of holes at an upper part of the longitudinal section may have a hole diameter being larger than the diameter of said majority of sets of holes. Larger holes at the upper part of the longitudinal section may prove advantageous for facilitating removal of contaminants dislodged and washed away from the second annulus at the beginning of the washing operation. This is particularly useful when the washing operation (typically) is initiated in a top-down fashion along the longitudinal section.
  • the flow guides may comprise radially extending collars.
  • one or more of the radially extending collars are structured for sealing, at least partially, against the surrounding first pipe body.
  • Such radially extending collars may comprise cup-shaped elements, typically termed “swab cups” in the industry.
  • Such cups may be formed of rubber or elastomer materials.
  • the radially extending collars comprise one or more radially expandable sealing devices structured for selective activation and expansion towards the first pipe body.
  • the one or more of the radially expandable sealing devices may comprise an inflatable element, for example an inflatable packer.
  • These radially expandable sealing devices may also be structured for selective deactivation and retraction from the first pipe body, which may allow the sealing devices to be set and unset multiple times within the first pipe body, thereby also allowing the sealing devices to be moved with relative ease when in a retracted position.
  • one or more flow guides may be structured for partial bypassing of fluid in a longitudinal direction within the first pipe body.
  • a partial flow of the washing fluid may therefore pass the flow guide(s), however without imparting a significant pressure drop in the confined pressure compartment, which otherwise might negatively affect the washing function of the washing tool.
  • the noted flow guides may therefore include, or be furnished with, one or more bypass conduits.
  • one or more peripheral sectors of the flow guides may have a smaller diameter than the inner diameter of the first pipe body, thereby providing bypass channels between the flow guide(s) and the first pipe body. Such bypassing of washing fluid during operation will create a limited longitudinal flow of fluid inside the first pipe, which may prove advantageous for facilitating removal of contaminants via the first pipe.
  • one or more flow guides above the confined pressure compartment are structured for partial bypassing of fluid in an upward direction within the first pipe body. During operation, this will create a limited upwardly directed flow of fluid inside the first pipe body for facilitating removal of contaminants to the surface of the well.
  • the present invention comprises a method of cleaning an annular area in a well, characterized in that the well comprises:
  • the method comprises connecting the washing tool to a lower end of a suitable tubular work string, for example a jointed pipe string (e.g. a drill string) or a coiled tubing string, for operation of the washing tool.
  • a suitable tubular work string for example a jointed pipe string (e.g. a drill string) or a coiled tubing string, for operation of the washing tool.
  • the method may comprise discharging the washing fluid from the holes in the first pipe body at a discharge velocity of at least 15 metres per second. More particularly, the method may comprise discharging the washing fluid at a discharge velocity of at least 50 metres per second. Discharge velocities in the order of 75-200 metres per second may also prove appropriate in some well scenarios.
  • the washing fluid used in the method may comprise drilling mud or some other suitable fluid, e.g. water or even diesel.
  • the method may comprise a subsequent step (E) of displacing, e.g. pumping, a fluidized plugging material into the first pipe body and placing the plugging material along at least the longitudinal section of the well, also allowing the fluidized plugging material to displace into the first annulus and the cleaned second annulus via the sets of holes in the first and second pipe bodies, thereby forming a cross-sectional (rock-to-rock) plug in the well.
  • the method would therefore represent a variant of the noted Perf-Wash-Cement method ("PWC ® " and "PWC, Perf-Wash-Cement ® ").
  • the fluidized plugging material may comprise any suitable material or combinations of such materials. Therefore, the fluidized plugging material may comprise at least one material chosen from a group comprising cementitious materials, particulate masses, polymer or epoxy materials (resins).
  • the method comprises displacing, e.g. pumping, the fluidized plugging material via the washing tool. This may offer more controlled displacement of the plugging material into the surrounding annuli.
  • the method comprises pumping the fluidized plugging material out of a lower end of a suitable tubular work string, typically a jointed pipe string (e.g. a drill string) or a coiled tubing string.
  • a suitable tubular work string typically a jointed pipe string (e.g. a drill string) or a coiled tubing string.
  • the noted work string which may be used with the washing tool, may also be employed for pumping the fluidized plugging material.
  • the method may comprise forming, between steps (D) and (E), one or more second sets of holes within the longitudinal section and through walls of the first and second pipe bodies, the second sets of holes having a larger hole diameter than the hole diameter of the sets of holes formed in step (A).
  • the larger hole diameter of the second sets of holes allow better fluid communication for displacing the fluidized plugging material into the first and second annuli.
  • the method may comprise using, in step (A), a perforating gun to form said sets of holes in the first and second pipe bodies.
  • the perforating gun may include explosive charges for generating narrow and long perforations, so-called production perforations, through the first and second pipe bodies.
  • the method may comprise using, in step (A), a mechanical cutting device to form said sets of holes in the first and second pipe bodies.
  • a mechanical cutting device may be structured for cutting, drilling or punching holes through the pipe bodies.
  • the method may comprise using, in step (A), an abrasive jetting device to form said sets of holes in the first and second pipe bodies.
  • a jetting device may be structured for discharging one or more abrasive cutting jets at a high velocity for cutting holes through the pipe bodies.
  • the jets are formed from a suitable fluid containing abrasive materials, for example fine grained sand materials.
  • the method may comprise forming, in step (A), one or more sets of holes at a bottom part of the longitudinal section, the one or more bottom sets of holes having a larger hole diameter than the hole diameter of a majority of the sets of holes.
  • this may prove advantageous for facilitating displacement of the fluidized plugging material into the first and second annuli along the longitudinal section.
  • the method may comprise forming, in step (A), one or more sets of holes at an upper part of the longitudinal section, the one or more upper sets of holes having a larger hole diameter than the hole diameter of a majority of the sets of holes.
  • step (A) may prove advantageous for facilitating removal of contaminants dislodged and washed away from the second annulus at the beginning of the washing operation.
  • Figure 1 shows a well 2 to be plugged and abandoned using a system and a method according to the present invention.
  • the well 2 comprises a first pipe body 4 and a surrounding second pipe body 6.
  • a first annulus 8 is located between the first and second pipe bodies 4, 6 and contains a clean fluid 10, here in the form of a substantially solids-free completion fluid.
  • a second annulus 12 outwardly surrounds the second pipe body 6 and contains contaminants 14 to be removed therefrom in a subsequent washing operation.
  • the second annulus 12 is located between the second pipe body 6 and a surrounding borehole wall 16 formed through subterranean formations 18.
  • the first pipe body 4 could be a production tubing or an injection tubing extending between the surface of the well 2 and a deeper formation (not shown).
  • the second pipe body 6 could be a production casing or an injection casing extending between the surface and a shallower level in the well 2 so as to surround a shallower section of said production or injection tubing, as shown in the figures.
  • a sealing material e.g. cement or similar, could also be present in the second annulus 12 at a bottom section (shoe) of the first pipe body 4 (not shown).
  • the first pipe body 4 may contain produced or injected fluids.
  • FIG. 2 shows the well 2 after having lowered a perforating gun 20 down to a section of the well 2.
  • the gun 20 may be tubing-conveyed or wireline-conveyed, as would be familiar to the skilled well practitioner.
  • the perforating gun 20 is shown connected to a lower end of a tubular work string 36, here in the form of a coiled tubing string.
  • a plurality of sets of holes 22 are formed and dispersed along a longitudinal section L of the well 2.
  • the extent of the hole sets 22 formed along the first pipe body 4 define the longitudinal section L. In this embodiment, these particular charges generate holes having a diameter of ca. 5 millimetres.
  • the sets of holes 22 are formed through walls of the first and second pipe bodies 4,6 for allowing fluid communication between the first pipe body 4 and the second annulus 12.
  • Each set of holes 20 comprises a first hole 22a formed through the first pipe body 4, and a second hole 22b formed through the second pipe body 6.
  • the first and second holes 22a, 22b are aligned in a substantially radial direction relative to a longitudinal axis of the first and second pipe bodies 4, 6.
  • the sets of holes 22 are dispersed in a substantially regular and even fashion along the longitudinal section L, having a substantially even hole set spacing and density along the longitudinal section L.
  • Figure 3 shows the well 2 after having set a mechanical plug 24 inside the first pipe body 4, and below the longitudinal section L, and after having lowered a washing tool 26 into the first pipe body 4 and having positioned it at a top part of the longitudinal section L.
  • the washing tool 26 comprises a set of spaced apart flow guides 28a, 28b configured to enclose of a limited number of sets of holes 22 along the longitudinal section L.
  • the spaced apart flow guides 28a, 28b comprise radially extending collars in the form of so-called swab cups sealing, at least partially, against an inside of first pipe body 4.
  • the flow guides 28a, 28b cooperate with the inside of the first pipe body 4 to form a confined pressure compartment 30 for enclosing said limited number of sets of holes 22 when operational in the well 2.
  • the washing tool 26 also includes a central mandrel 32 furnished with discharge openings 34 for allowing fluid communication between the pressure compartment 30 and an upper end of the mandrel 32.
  • Said tubular work string 36 (coiled tubing string) is shown connected to the upper end of the mandrel 32 for operation of the washing tool 26.
  • FIG 3 also shows the washing tool 26 whilst being supplied a pressurized washing fluid 38, here in the form of drilling mud, from the surface via the work string 36 and into the confined compartment 30 via the mandrel 32 and the discharge openings 34 therein.
  • the pressurized washing fluid 38 discharges from the compartment 30 as high velocity flushing jets 40 passing through respective aligned holes 22a, 22b of the limited sets of holes 22 located within the confined compartment 30.
  • the flushing jets 40 also pass through the clean fluid 10 in the first annulus 8, thereby allowing the flushing jets 40 to engage and clean away contaminants 14 located within a top part of the second annulus 12.
  • the flushing jets 40 are shown as straight arrows through the aligned holes 22a, 22b.
  • the liberated contaminants 14 entrained with the washing fluid 38 are removed via other hole sets 22, and via the second annulus 12, at this top part of the longitudinal section L.
  • the returning washing fluid 38 with liberated contaminants 14 then enter the first pipe body 4 above the location of the washing tool 26 and flows to the surface of the well 2.
  • the flow path of the returning washing fluid 38 is indicated with curved arrows in Figures 3 and 4 .
  • Figure 4 shows the washing tool 26 whilst washing at a bottom part of the longitudinal section L, and after having moved the washing tool 26 successively downward inside the first pipe body 4.
  • the flushing jets 40 have dislodged and cleaned away contaminants 14 within substantially the entire second annulus 12 along the perforated longitudinal section L.
  • the washing tool 26 is typically moved upward along the longitudinal section L to facilitate further (residual) cleaning within the second annulus 12.
  • the down-and-up washing procedure may be repeated one or more times, if desired or required.
  • Figure 5 shows the well 2 after having completed a subsequent step of pumping a fluidized plugging material 42 into the first pipe body 4 and placing the plugging material 42 along at least the longitudinal section L of the well 2.
  • the fluidized plugging material 42 is also allowed to displace into the first annulus 8 and the cleaned second annulus 12 via the sets of holes 22 in the first and second pipe bodies 4, 6, thereby forming a cross-sectional plug in the well 2.
  • the plugging material 42 may be displaced into the well 2 in any suitable manner, as would be known to the skilled well practitioner.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Cleaning In General (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Threshing Machine Elements (AREA)

Claims (15)

  1. Ein System zur Reinigung eines ringförmigen Bereichs in einem Bohrloch (2),
    dadurch gekennzeichnet, dass das System umfasst:
    - einen ersten Rohrkörper (4) und einen umgebenden zweiten Rohrkörper (6), die in dem Bohrloch (2) angeordnet sind;
    - einen ersten Ringraum (8), der zwischen dem ersten und dem zweiten Rohrkörper (4, 6) angeordnet ist, wobei der erste Ringraum (8) ein Reinfluid (10) enthält, das als ein Fluid definiert ist, das im Wesentlichen frei von strömungshemmenden Verunreinigungen ist;
    - einen zweiten Ringraum (12), der den zweiten Rohrkörper (6) von außen umgibt, wobei der zweite Ringraum (12) aus diesem zu entfernende Verunreinigungen (14) enthält;
    - eine Vielzahl von Lochsätzen (22), die durch die Wände des ersten und des zweiten Rohrkörpers (4, 6) hindurch ausgebildet und entlang eines Längsschnitts (L) des Bohrlochs (2) verteilt sind, um eine Fluidverbindung zwischen dem ersten Rohrkörper (4) und dem zweiten Ringraum (12) zu ermöglichen, wobei jeder Lochsatz (22) Öffnungen (22a, 22b) umfasst, die im Wesentlichen radial durch den ersten und den zweiten Rohrkörper (4, 6) ausgerichtet sind; und
    - ein Waschwerkzeug (26), das in dem ersten Rohrkörper (4) an dem Längsabschnitt (L) angeordnet ist, wobei das Waschwerkzeug (26) einen Satz beabstandeter Strömungsführungen (28a, 28b) umfasst, die so konfiguriert sind, dass sie eine begrenzte Anzahl von Lochsätzen (22) entlang des Längsabschnitts (L) umschließen, wobei die Strömungsführungen (28a, 28b) mit einer Innenseite des ersten Rohrkörpers (4) zusammenwirken, um eine abgrenzte Druckkammer (30) für die begrenzte Anzahl von Lochsätzen (22) zu bilden, wenn diese in dem Bohrloch (2) in Betrieb sind.
  2. Das System nach Anspruch 1, wobei das Waschwerkzeug (26) mit einem unteren Ende eines rohrförmigen Arbeitsstrangs (36) zum Betrieb des Waschwerkzeugs (26) verbunden ist.
  3. Das System nach Anspruch 1 oder 2, wobei zumindest eine Mehrzahl der Lochsätze (22) einen Öffnungsdurchmesser in der Größenordnung von 2-15 Millimetern aufweist.
  4. Das System nach Anspruch 3, wobei ein oder mehrere Lochsätze (22) an einem unteren Teil des Längsabschnitts (L) einen Öffnungsdurchmesser aufweisen, der größer ist als der Öffnungsdurchmesser der genannten Mehrzahl an Lochsätzen (22).
  5. Das System nach Anspruch 3 oder 4, wobei ein oder mehrere Lochsätze (22) an einem oberen Teil des Längsabschnitts (L) einen Öffnungsdurchmesser aufweisen, der größer ist als der Durchmesser der genannten Mehrzahl an Lochsätzen (22).
  6. Das System nach einem der Ansprüche 1-5, wobei die Strömungsführungen (28a, 28b) radial verlaufende Manschetten umfassen.
  7. Das System nach Anspruch 6, wobei einer oder mehrere der sich radial verlaufenden Manschetten (28a, 28b) so ausgebildet sind, dass sie zumindest teilweise gegen den umgebenden ersten Rohrkörper (4) abdichtend wirken.
  8. Das System nach Anspruch 6, wobei die radial verlaufenden Manschetten (28a, 28b) eine oder mehrere radial ausdehnbare Dichtungsvorrichtungen umfassen, die so strukturiert sind, dass sie selektiv aktiviert und in Richtung des ersten Rohrkörpers (4) ausgedehnt werden können.
  9. Das System nach einem der Ansprüche 1-8, wobei eine oder mehrere Strömungsführungen (28a, 28b) für einen teilweisen Umleitung des Fluids in einer Längsrichtung innerhalb des ersten Rohrkörpers (4) ausgebildet sind.
  10. Ein Verfahren zur Reinigung eines ringförmigen Bereichs in einem Bohrloch (2),
    dadurch gekennzeichnet, dass das Bohrloch (2) umfasst:
    einen ersten Rohrkörper (4) und einen umgebenden zweiten Rohrkörper (6);
    einen ersten Ringraum (8), der zwischen dem ersten und dem zweiten Rohrkörper (4, 6) angeordnet ist, wobei der erste Ringraum (8) ein Reinfluid (10) enthält, das als ein Fluid definiert ist, das im Wesentlichen frei von strömungshemmenden Verunreinigungen ist; und
    einen zweiten Ringraum (12), der den zweiten Rohrkörper (6) von außen umgibt, wobei der zweite Ringraum (12) aus diesem zu entfernende Verunreinigungen (14) enthält; wobei das Verfahren folgende Schritte umfasst:
    (A) Ausbilden und Verteilen einer Vielzahl von Lochsätzen (22) entlang eines Längsschnitts (L) des Bohrlochs (2) durch die Wände des ersten und zweiten Rohrkörpers (4, 6), um eine Fluidverbindung zwischen dem ersten Rohrkörper (4) und dem zweiten Ringraum (12) zu ermöglichen, wobei jeder Lochsatz (22) Öffnungen (22a, 22b) umfasst, die im Wesentlichen radial durch den ersten und zweiten Rohrkörper (4, 6) ausgerichtet sind;
    (B) Positionieren eines Waschwerkzeugs (26) in dem ersten Rohrkörper (4) an dem Längsabschnitt (L), wobei das Waschwerkzeug (26) einen Satz beabstandeter Strömungsführungen (28a, 28b) umfasst, die so konfiguriert sind, dass sie eine begrenzte Anzahl von Lochsätzen (22) entlang des Längsabschnitts (L) umschließen, wobei die Strömungsführungen (28a, 28b) mit einer Innenseite des ersten Rohrkörpers (4) zusammenwirken, um eine abgrenzte Druckkammer (30) für die begrenzte Anzahl von Lochsätzen (22) zu bilden;
    (C) Zuführen eines unter Druck stehenden Spülfluids (38) in die abgegrenzte Druckkammer (30) und Ableiten des Spülfluids (38) aus dieser in Form von Hochgeschwindigkeitsspülstrahlen (40), die durch entsprechende ausgerichtete Öffnungen (22a, 22b) der sich in der abgegrenzten Druckkammer (30) befindlichen begrenzten Lochsätze (22) hindurchtreten, wobei die Spülstrahlen (40) auch durch das Reinfluid (10) in dem ersten Ringraum (8) hindurchtreten, sodass die Spülstrahlen (40) mit sich in dem zweiten Ringraum (12) befindlichen Verunreinigungen (14) in Kontakt kommen und diese entfernen können; und
    (D) Bewegen des Waschwerkzeugs (26) entlang des Längsabschnitts (L), während der abgegrenzten Druckkammer (30) unter Druck stehendes Spülfluid (38) zugeführt wird, wodurch Verunreinigungen (14) aus dem zweiten Ringraum (12) entlang des Längsabschnitts (L) weggespült werden.
  11. Das Verfahren nach Anspruch 10, umfassend das Verbinden des Waschwerkzeugs (26) mit einem unteren Ende eines rohrförmigen Arbeitsstrangs (36) zum Betrieb des Waschwerkzeugs (26).
  12. Das Verfahren nach Anspruch 10 oder 11, umfassend das Ableiten des Spülfluids (38) mit einer Austrittsgeschwindigkeit von mindestens 15 Metern pro Sekunde aus den Öffnungen (22a) in dem ersten Rohrkörper (4).
  13. Das Verfahren nach Anspruch 12, umfassend das Ableiten des Spülfluids (38) mit einer Austrittsgeschwindigkeit von mindestens 50 Metern pro Sekunde.
  14. Das Verfahren nach einem der Ansprüche 10-13, umfassend einen anschließenden Schritt (E), bei dem ein verflüssigtes Füllmaterial (42) in den ersten Rohrkörper (4) verdrängt wird und das Füllmaterial (42) zumindest entlang des Längsschnitts (L) des Bohrlochs (2) platziert wird, wobei das verflüssigte Füllmaterial (42) außerdem in den ersten Ringraum (8) und den gereinigten zweiten Ringraum (12) über die Lochsätze (22) in den ersten und zweiten Rohrkörpern (4, 6) verdrängt werden kann, wodurch ein Querschnittspfropfen in dem Bohrloch (2) gebildet wird.
  15. Das Verfahren nach Anspruch 14, umfassend das Verdrängen des verflüssigten Füllmaterials (42) über das Waschwerkzeug (26).
EP18867925.2A 2017-10-17 2018-10-17 System und verfahren zur reinigung eines ringförmigen bereichs in einem bohrloch Active EP3698015B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20171650A NO345810B1 (en) 2017-10-17 2017-10-17 A system and method of cleaning an annular area of a second annulus in a well
PCT/NO2018/050247 WO2019078728A2 (en) 2017-10-17 2018-10-17 SYSTEM AND METHOD FOR CLEANING AN ANNULAR AREA IN A WELL

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EP3698015A2 EP3698015A2 (de) 2020-08-26
EP3698015A4 EP3698015A4 (de) 2021-07-14
EP3698015B1 true EP3698015B1 (de) 2024-05-22

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AU (1) AU2018351422B2 (de)
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NO345811B1 (en) * 2018-07-10 2021-08-16 Hydra Systems As A method of performing abrasive perforation and washing in a well
NO346193B1 (en) * 2019-06-17 2022-04-11 Archer Oiltools As Toolstring assembly and method for releasing and removing a stuck casing
NO346617B1 (en) 2020-03-09 2022-10-31 Hydra Systems As A fluid diverter tool, system and method of diverting a fluid flow in a well
NO346276B1 (no) * 2021-04-12 2022-05-16 Archer Oiltools As Pakningssammenstilling
NO346642B1 (no) * 2021-12-13 2022-11-14 Archer Oiltools As Fôringsrørannulus-vaskeverktøy og fremgangsmåte for bruk i brønnrør med restriksjon
WO2025256998A1 (en) * 2024-06-14 2025-12-18 Archer Oiltools As Well tool and method for well interventions

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US2512801A (en) * 1947-02-17 1950-06-27 Shell Dev Perforation washer
US3396798A (en) * 1966-11-14 1968-08-13 Burns Tool Co Circulating washer tool
US4899821A (en) * 1989-01-12 1990-02-13 Hydro-Tool Company, Inc. Method and apparatus for servicing well casing and the like
GB2275282B (en) * 1993-02-11 1996-08-07 Halliburton Co Abandonment of sub-sea wells
NO335972B1 (no) * 2011-01-12 2015-04-07 Hydra Systems As Fremgangsmåte for kombinert rengjøring og plugging i en brønn, vaskeverktøy for retningsstyrt spyling i en brønn, samt anvendelse av vaskeverktøyet
EP2805010B1 (de) * 2012-01-17 2017-02-01 Halliburton Energy Services, Inc. Verfahren zur isolierung von ringförmigen bereichen aus mehreren produktionsfahrten in einem bohrloch
NO339082B1 (no) * 2012-03-09 2016-11-14 Hydra Systems As Fremgangsmåte for kombinert rengjøring og plugging i en brønn
NO337162B1 (no) * 2013-03-20 2016-02-01 Hydra Panda As Fremgangsmåte, system og anvendelse for plugging av en brønn
NO336249B1 (no) * 2014-02-18 2015-06-29 Well Technology As Hydraulisk kutteverktøy, system og fremgangsmåte for styrt hydraulisk kutting gjennom en rørvegg i en brønn, samt anvendelser av kutteverktøyet og systemet
NO340959B1 (en) 2015-06-10 2017-07-31 Hydra Systems As A method of plugging and abandoning a well

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MY205745A (en) 2024-11-11
BR112020004380A2 (pt) 2020-09-08
EP3698015A2 (de) 2020-08-26
AU2018351422B2 (en) 2021-04-29
WO2019078728A2 (en) 2019-04-25
WO2019078728A3 (en) 2019-08-01
EP3698015A4 (de) 2021-07-14
NO345810B1 (en) 2021-08-16
AU2018351422A1 (en) 2020-03-05
DK3698015T3 (da) 2024-06-17
NO20171650A1 (en) 2018-03-01

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