WO2004063525A1 - A method and device for drilling into tubulars located within one another - Google Patents

A method and device for drilling into tubulars located within one another Download PDF

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Publication number
WO2004063525A1
WO2004063525A1 PCT/NO2004/000005 NO2004000005W WO2004063525A1 WO 2004063525 A1 WO2004063525 A1 WO 2004063525A1 NO 2004000005 W NO2004000005 W NO 2004000005W WO 2004063525 A1 WO2004063525 A1 WO 2004063525A1
Authority
WO
WIPO (PCT)
Prior art keywords
feed
drill bit
drilling
pressure fluid
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/NO2004/000005
Other languages
French (fr)
Inventor
Tor H. Johannessen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Norse Cutting and Abandonment AS
Original Assignee
Norse Cutting and Abandonment AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Norse Cutting and Abandonment AS filed Critical Norse Cutting and Abandonment AS
Priority to EP04701709A priority Critical patent/EP1588021B1/en
Priority to US10/541,835 priority patent/US20060231291A1/en
Priority to BR0406732-0A priority patent/BRPI0406732A/en
Priority to AU2004204324A priority patent/AU2004204324B2/en
Priority to DE602004001756T priority patent/DE602004001756D1/en
Publication of WO2004063525A1 publication Critical patent/WO2004063525A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
    • E21B29/002—Cutting, e.g. milling, a pipe with a cutter rotating along the circumference of the pipe
    • 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
    • E21B44/02—Automatic control of the tool feed
    • E21B44/04—Automatic control of the tool feed in response to the torque of the drive ; Measuring drilling torque

Definitions

  • This invention relates to a method for drilling into tubulars which are located within one another. More specifically, it relates to a method for reducing drilling time when drilling through at least one pipe wall and there in an annulus within the pipe wall is a fluid or a material which in comparison to the pipe wall material is easier to drill.
  • the invention also comprises a device for carrying out the method.
  • the internal pipes may become displaced axially and/or radially in relation to the external pipe during the sawing operation. The displacement may cause damage to the sawing device that is being used.
  • one or more drilling devices are placeded mainly in a radial direction on the casing surface of the external pipe.
  • the drilling device may be hydraulically driven with regards to both rotation and feeding.
  • the drill bit of the drilling device is fed at a certain rate when rotating through the external pipe, the material located in the external annulus, and potentially further on through the pipe within, the next annulus and so on till the innermost pipe where the drill can be used for bracing by means of the feed power or for drilling through the pipe wall of the innermost pipe as well. Then, the drill may be used for bracing or it may be replaced with for instance a shaft to brace the pipes .
  • Drilling operations in accordance with prior art take unnecessary long time because the drill is running at an approximately constant feed speed during the entire drilling operation.
  • the object of this invention is to remedy the disadvantages of the prior art.
  • the drill bit can be fed at a significantly higher rate when it is working for example within concrete, compared to the feed speed which is appropriate for drilling in the pipe wall material.
  • a valve for additional supply of hydraulic fluid to the feed cylinders of the drilling device is opened without disrupting the choke valve or constant pressure valve that is used to adjust the feed speed of the sawing device for drilling through the pipe wall material.
  • the rotational resistance of the drill is then increased, and a corresponding higher pressure can be read in the hydraulic circuit for drill bit rotation.
  • the additional pressure fluid supply is shut off, whereby the drill bit continues to drill through the pipe wall material at the preset feed speed. The method is repeated for any annuli and pipe walls located within.
  • the drilling time for perforating pipes containing other pipes within can be significantly reduced.
  • the method may contribute to considerable cost savings, as the hourly rates for this type of work, including hiring a drilling rig, are relatively high.
  • Figure 1 shows a cross section of a pipe assembly comprising a pipe with two pipes within it, where the annuli between the pipes are filled with concrete, and where two drilling devices are placed on the pipe and are about to drill holes in the pipe fitting;
  • Figure 2 shows a cross section I-I of the drilling device in Figure 1;
  • Figure 3 shows a simplified hydraulic circuit diagram for the drilling device.
  • the reference number 1 denotes a drilling device provided with a drill bit 2 which is secured to an external tubular 6 by means of a fastening device 4. Inside the external tubular 6 there is located an intermediate tubular 8, and inside the intermediate tubular 8 there is an internal tubular 10.
  • the spaces between the tubulars 6, 8 and 10 constitute an external annulus 12 and an internal annulus 14.
  • the annuli 12 and 14 are filled with concrete.
  • the drilling device 1 comprises a feed rod 22 which is connected to the drill bit 2 by means of an adapter 20.
  • the feed rod 22 is axially displaceable in the housing 24 of the drilling device 1 by means of two feed cylinders 26.
  • the feed cylinders 26 are connected between the housing 24 and an axial bearing 28 placed around the feed rod 22.
  • Two hydraulic driving motors 30 are connected to the housing 24 and encircle the feed rod 22 in an axially displaceable manner.
  • the drilling device 1 is controlled by means of a rotary valve 40 and a feed valve 42.
  • the valves 40 and 42 are located at a safe distance from the drilling device 1 and supplied with pressure fluid from a hydraulic pump (not shown) .
  • hydraulic pipes 44 pass via quick release couplings 46 to the driving motors 30.
  • a hydraulic feed line 48 connects the feed valve 42 via a quick release coupling 50 and a choke valve 52 to the feed side of the feed cylinders 26.
  • the return side of the feed cylinders 26 is connected to the feed valve 42 by means of a hydraulic return line 54 and a quick release coupling 56.
  • a quick feed valve 58 is connected to the hydraulic feed line 48 at the feed valve 42. From the quick feed valve 58, a quick feed hydraulic line 60 passes via a quick release coupling 62 to the hydraulic feed line 48 in the area between the choke valve 52 and the feed cylinders 26.
  • the quick release couplings 46, 50, 56 and 62 are arranged to facilitate the assembly of the drilling device 1.
  • the desired feed speed for the drill bit 2 is adjusted by regulating the choke valve 52, preferably before the drilling operations commence .
  • the rotation of the drill bit 2 is initiated by setting the rotary valve 40 to operating position. Pressure fluid then flows through the rotary valve 40 and the driving motors 30 via the hydraulic lines 44 and the quick release couplings 46.
  • the driving motors 30 rotate the feed rod 22 and thus the drill bit 2 around its own longitudinal axis.
  • the feeding of the drill bit 2 is initiated by setting the feed valve 42 to its feeding position. By doing so, pressure fluid flows from the feed valve 42 via the hydraulic feed line 48, the quick release coupling 50 and the choke valve 42 to the feed side of the feed cylinders, as the feed cylinders displace the axial bearing 28 and thus the feed rod 22 and the drill bit 2 in a direction in and towards the external tubular 6.
  • the quick feed valve 58 By opening the quick feed valve 58, pressure fluid flows to the feed side of the feed cylinders 26 through the hydraulic quick feed line 60 and the quick release coupling 62 bypassing the choke valve 52.
  • the drill bit 2 is fed quicker through the concrete in the external annulus 12 , cf . the drill bit 2 belonging to the lower drilling device in figure 1.
  • the rotational resistance in the drill bit 2 is increased.
  • the corresponding increase in pressure can be read from the manometer 64.
  • the quick feed valve 58 is shut, whereby the feed speed of the drill bit 2 through the pipe wall of the intermediate tubular 8 is reduced to the preset value on the choke valve 52.
  • the feed speed is increased when drilling through the internal annulus 14 and possibly through the annulus of the internal pipe 10.

Landscapes

  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Drilling And Boring (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Punching Or Piercing (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

Method and device to increase the feed speed of a drill bit (2) and its associated drilling device (1) when drilling through tubulars (6, 8, 10) located within one another where in the annuli (12, 14) created between the tubulars (6, 8, 10) there is located a material or a fluid which in compari­son to the pipe wall material is easer to drill, and where the feed speed of the drill bit (2) is controlled by a pressure fluid regulating valve (52) which preferably is located close to the drilling device (1), and where there during the progress of the drill bit (2) through the annulus (12, 14) is opened for an influx of pressure fluid in parallel with the pressure fluid regulating valve (52).

Description

A METHOD AND A DEVICE FOR DRILLING INTO TUBULARS LOCATED WITHIN ONE ANOTHER
This invention relates to a method for drilling into tubulars which are located within one another. More specifically, it relates to a method for reducing drilling time when drilling through at least one pipe wall and there in an annulus within the pipe wall is a fluid or a material which in comparison to the pipe wall material is easier to drill. The invention also comprises a device for carrying out the method.
When removing for example composite casings for petroleum recovery, it has become customary to cut pipes by sawing. Often the pipe that has to be cut will contain one or more internal pipes. The annuli between the pipes may be filled with for example concrete.
If the internal pipes are insufficiently connected to the external pipe, the internal pipes may become displaced axially and/or radially in relation to the external pipe during the sawing operation. The displacement may cause damage to the sawing device that is being used.
P24221PCOODE-04.03.2004 It has therefore been deemed necessary to brace the internal pipes in relation to the external pipe before the actual sawing operation is initiated.
According to prior art one or more drilling devices are placeded mainly in a radial direction on the casing surface of the external pipe. The drilling device may be hydraulically driven with regards to both rotation and feeding.
The drill bit of the drilling device is fed at a certain rate when rotating through the external pipe, the material located in the external annulus, and potentially further on through the pipe within, the next annulus and so on till the innermost pipe where the drill can be used for bracing by means of the feed power or for drilling through the pipe wall of the innermost pipe as well. Then, the drill may be used for bracing or it may be replaced with for instance a shaft to brace the pipes .
Due to the relatively long distance between the operating valves of the drilling device and the drill site, it is necessary to place the choke valve or constant pressure valve used for adjusting the feed speed of the drilling device near to the drilling device in order to overcome the flexibility of the pressure fluid pipe. There will only be restricted access to this valve during the drilling operation, as it may be dangerous for personnel to be in close proximity to the drilling device when it is operating.
Drilling operations in accordance with prior art take unnecessary long time because the drill is running at an approximately constant feed speed during the entire drilling operation.
The object of this invention is to remedy the disadvantages of the prior art.
The object is achieved according to the invention by means of the features disclosed in the description below and in the following patent claims.
Experience has shown that the drill bit can be fed at a significantly higher rate when it is working for example within concrete, compared to the feed speed which is appropriate for drilling in the pipe wall material.
When the drill bit has cut through the first pipe wall, the rotational resistance in the drill bit is reduced, whereby the oil pressure in the hydraulic circuit for drill bit rotation is reduced. According to the invention, a valve for additional supply of hydraulic fluid to the feed cylinders of the drilling device is opened without disrupting the choke valve or constant pressure valve that is used to adjust the feed speed of the sawing device for drilling through the pipe wall material. Thus the drill is displaced fairly quickly through the concrete material and until the drill bit impacts the pipe wall located within. The rotational resistance of the drill is then increased, and a corresponding higher pressure can be read in the hydraulic circuit for drill bit rotation. The additional pressure fluid supply is shut off, whereby the drill bit continues to drill through the pipe wall material at the preset feed speed. The method is repeated for any annuli and pipe walls located within.
By employing the method according to the invention, the drilling time for perforating pipes containing other pipes within can be significantly reduced. The method may contribute to considerable cost savings, as the hourly rates for this type of work, including hiring a drilling rig, are relatively high.
In the following, a non-limited example of a preferred method and embodiment is described and illustrated on the attached drawings , in which:
Figure 1 shows a cross section of a pipe assembly comprising a pipe with two pipes within it, where the annuli between the pipes are filled with concrete, and where two drilling devices are placed on the pipe and are about to drill holes in the pipe fitting;
Figure 2 shows a cross section I-I of the drilling device in Figure 1; and
Figure 3 shows a simplified hydraulic circuit diagram for the drilling device.
On the drawings, the reference number 1 denotes a drilling device provided with a drill bit 2 which is secured to an external tubular 6 by means of a fastening device 4. Inside the external tubular 6 there is located an intermediate tubular 8, and inside the intermediate tubular 8 there is an internal tubular 10.
The spaces between the tubulars 6, 8 and 10 constitute an external annulus 12 and an internal annulus 14. The annuli 12 and 14 are filled with concrete.
In addition to the drill bit 2, the drilling device 1 comprises a feed rod 22 which is connected to the drill bit 2 by means of an adapter 20. The feed rod 22 is axially displaceable in the housing 24 of the drilling device 1 by means of two feed cylinders 26. The feed cylinders 26 are connected between the housing 24 and an axial bearing 28 placed around the feed rod 22. Two hydraulic driving motors 30 are connected to the housing 24 and encircle the feed rod 22 in an axially displaceable manner.
The drilling device 1 is controlled by means of a rotary valve 40 and a feed valve 42. The valves 40 and 42 are located at a safe distance from the drilling device 1 and supplied with pressure fluid from a hydraulic pump (not shown) . From the rotary valve 40 hydraulic pipes 44 pass via quick release couplings 46 to the driving motors 30. A hydraulic feed line 48 connects the feed valve 42 via a quick release coupling 50 and a choke valve 52 to the feed side of the feed cylinders 26. The return side of the feed cylinders 26 is connected to the feed valve 42 by means of a hydraulic return line 54 and a quick release coupling 56.
A quick feed valve 58 is connected to the hydraulic feed line 48 at the feed valve 42. From the quick feed valve 58, a quick feed hydraulic line 60 passes via a quick release coupling 62 to the hydraulic feed line 48 in the area between the choke valve 52 and the feed cylinders 26. The quick release couplings 46, 50, 56 and 62 are arranged to facilitate the assembly of the drilling device 1.
The desired feed speed for the drill bit 2 is adjusted by regulating the choke valve 52, preferably before the drilling operations commence .
When a hole shall be drilled and the drilling device 1 is attached to the external tubular 6, the rotation of the drill bit 2 is initiated by setting the rotary valve 40 to operating position. Pressure fluid then flows through the rotary valve 40 and the driving motors 30 via the hydraulic lines 44 and the quick release couplings 46. The driving motors 30 rotate the feed rod 22 and thus the drill bit 2 around its own longitudinal axis.
The feeding of the drill bit 2 is initiated by setting the feed valve 42 to its feeding position. By doing so, pressure fluid flows from the feed valve 42 via the hydraulic feed line 48, the quick release coupling 50 and the choke valve 42 to the feed side of the feed cylinders, as the feed cylinders displace the axial bearing 28 and thus the feed rod 22 and the drill bit 2 in a direction in and towards the external tubular 6.
It is necessary to place the choke valve 52 near to the feed cylinders 26 because otherwise the elasticity of the hydraulic feed line 48 could cause an irregular feed speed. After the drill bit 2 has worked its way through the pipe wall of the external tubular 6, cf. the drill bit 2 belonging to the top drilling device 1 in figure 1, the momentum needed to rotate the drill bit 2 is reduced because the concrete located in the external annulus 12 is easier to drill than the wall of the tubular 6. The rotational fluid pressure, which can be read on a manometer 64, is reduced correspondingly.
By opening the quick feed valve 58, pressure fluid flows to the feed side of the feed cylinders 26 through the hydraulic quick feed line 60 and the quick release coupling 62 bypassing the choke valve 52. Thus, the drill bit 2 is fed quicker through the concrete in the external annulus 12 , cf . the drill bit 2 belonging to the lower drilling device in figure 1. When the drill bit 2 has reached the intermediate tubular 8, the rotational resistance in the drill bit 2 is increased. The corresponding increase in pressure can be read from the manometer 64. The quick feed valve 58 is shut, whereby the feed speed of the drill bit 2 through the pipe wall of the intermediate tubular 8 is reduced to the preset value on the choke valve 52.
Correspondingly, the feed speed is increased when drilling through the internal annulus 14 and possibly through the annulus of the internal pipe 10.

Claims

Patent Claims
1. A method for a drilling device (1) to increase the feed speed of a drill bit (2) when drilling through tubulars (6, 8, 10) located within one another, where there in the annuli (12, 14) created between the tubulars (6, 8, 10) is located a fluid or a material which in comparison to the pipe wall material, is easier to drill, and where the feed speed of the drill bit (2) is controlled by a pressure fluid regulating valve (52) which preferably is located near to the drilling device (1), chara c t e ri s ed in that during the progress of the drill bit (2) through the annulus (12, 14) there is opened for an influx of pressure fluid in parallel with the pressure fluid regulating valve (52) .
2. A method according to claim 1, charac t er i s ed i n that the influx of pressure fluid is initiated by opening a valve (58) which is located at a safe distance from the drilling device (1) .
3. A device for a drilling device to increase the feed speed of a drill bit (2) when drilling through tubulars (6, 8, 10) located within one another and under water, where there in the annulus (12, 14) created between the tubulars (6, 8, 10) is located a fluid or a material, which in comparison to the pipe wall material, is easier to drill, and where the feed speed of the drill bit (2) is controlled by a pressure fluid regulating valve (52) which is connected to a hydraulic feed line (48) and where the hydraulic feed line (48) passes from a feed valve (40) to a feed cylinder (26) , as the pressure fluid regulating valve (52) preferably is located close to the drilling device (1), charac t er i s ed in that there in parallel with and connected to the hydraulic feed line (48) above and underneath the pressure fluid regulating valve (52) passes a hydraulic quick feed line (60) which is provided with a block valve (58) .
4. A device according to claim 3, charac t er i s ed i n that the block valve (58) is placed at a safe distance from the drilling device (1) .
PCT/NO2004/000005 2003-01-13 2004-01-13 A method and device for drilling into tubulars located within one another Ceased WO2004063525A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP04701709A EP1588021B1 (en) 2003-01-13 2004-01-13 A method and device for drilling into tubulars located within one another
US10/541,835 US20060231291A1 (en) 2003-01-13 2004-01-13 Method and device for drilling into tubulars located within one another
BR0406732-0A BRPI0406732A (en) 2003-01-13 2004-01-13 Method and device for piercing tubular elements located within each other
AU2004204324A AU2004204324B2 (en) 2003-01-13 2004-01-13 A method and device for drilling into tubulars located within one another
DE602004001756T DE602004001756D1 (en) 2003-01-13 2004-01-13 METHOD AND DEVICE FOR DRILLING MULTIPLE PIPES

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20030149A NO317433B1 (en) 2003-01-13 2003-01-13 Method and apparatus for drilling inside tubes located within each other
FI20030149 2003-01-13

Publications (1)

Publication Number Publication Date
WO2004063525A1 true WO2004063525A1 (en) 2004-07-29

Family

ID=19914372

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2004/000005 Ceased WO2004063525A1 (en) 2003-01-13 2004-01-13 A method and device for drilling into tubulars located within one another

Country Status (8)

Country Link
US (1) US20060231291A1 (en)
EP (1) EP1588021B1 (en)
AT (1) ATE335122T1 (en)
BR (1) BRPI0406732A (en)
DE (1) DE602004001756D1 (en)
DK (1) DK1588021T3 (en)
NO (1) NO317433B1 (en)
WO (1) WO2004063525A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7946793B2 (en) 2008-03-28 2011-05-24 Fastorq, Llc Apparatus for drilling colinear holes through concentric pipes

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2623911T3 (en) 2010-09-09 2017-07-12 National Oilwell Varco, L.P. Rotary drilling device for well bottom with members of training interface and control system
US8869916B2 (en) 2010-09-09 2014-10-28 National Oilwell Varco, L.P. Rotary steerable push-the-bit drilling apparatus with self-cleaning fluid filter
CN103406939B (en) * 2013-07-19 2016-03-30 广东联塑科技实业有限公司 A kind of PVC leaky pipe producing device
US12090538B1 (en) * 2020-12-09 2024-09-17 Roscoe Moss Manufacturing Company System, apparatus, and method for quality control inspection

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US4619556A (en) * 1983-11-14 1986-10-28 Parra Ernest P Method and apparatus for severing a tubular member
US5392858A (en) * 1994-04-15 1995-02-28 Penetrators, Inc. Milling apparatus and method for well casing
EP0791722A1 (en) * 1996-02-20 1997-08-27 Schlumberger Limited Apparatus and method for drilling with a flexible shaft from within a borehole
DE19924200A1 (en) * 1999-05-27 2000-11-30 Tracto Technik Drill speed-feed control involves regulating feed depending on measured tool rotation so revolution rate is constant; feed is reduced, adjusted or reversed if rotation less than demand value
US6155343A (en) * 1996-10-25 2000-12-05 Baker Hughes Incorporated System for cutting materials in wellbores
US6167968B1 (en) * 1998-05-05 2001-01-02 Penetrators Canada, Inc. Method and apparatus for radially drilling through well casing and formation

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US3903697A (en) * 1974-07-24 1975-09-09 Azcon Corp Variable speed hydraulic drive
US4271914A (en) * 1976-12-02 1981-06-09 The United States Of America As Represented By The Secretary Of The Interior Automatic feed and rotational speed control system of a hydraulic motor operated drill
US4185652A (en) * 1977-10-31 1980-01-29 Nl Industries, Inc. Subaqueous sequence valve mechanism
US4226288A (en) * 1978-05-05 1980-10-07 California Institute Of Technology Side hole drilling in boreholes
US5564455A (en) * 1995-01-06 1996-10-15 The Charles Machine Works, Inc. Hydraulic circuit for automatic control of a horizontal boring machine

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Publication number Priority date Publication date Assignee Title
US4619556A (en) * 1983-11-14 1986-10-28 Parra Ernest P Method and apparatus for severing a tubular member
US5392858A (en) * 1994-04-15 1995-02-28 Penetrators, Inc. Milling apparatus and method for well casing
EP0791722A1 (en) * 1996-02-20 1997-08-27 Schlumberger Limited Apparatus and method for drilling with a flexible shaft from within a borehole
US6155343A (en) * 1996-10-25 2000-12-05 Baker Hughes Incorporated System for cutting materials in wellbores
US6167968B1 (en) * 1998-05-05 2001-01-02 Penetrators Canada, Inc. Method and apparatus for radially drilling through well casing and formation
DE19924200A1 (en) * 1999-05-27 2000-11-30 Tracto Technik Drill speed-feed control involves regulating feed depending on measured tool rotation so revolution rate is constant; feed is reduced, adjusted or reversed if rotation less than demand value

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7946793B2 (en) 2008-03-28 2011-05-24 Fastorq, Llc Apparatus for drilling colinear holes through concentric pipes

Also Published As

Publication number Publication date
US20060231291A1 (en) 2006-10-19
EP1588021A1 (en) 2005-10-26
NO317433B1 (en) 2004-10-25
ATE335122T1 (en) 2006-08-15
DK1588021T3 (en) 2006-12-04
BRPI0406732A (en) 2005-12-20
NO20030149D0 (en) 2003-01-13
DE602004001756D1 (en) 2006-09-14
EP1588021B1 (en) 2006-08-02

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