WO1999058807A1 - Dispositif de guidage - Google Patents

Dispositif de guidage Download PDF

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Publication number
WO1999058807A1
WO1999058807A1 PCT/GB1999/001505 GB9901505W WO9958807A1 WO 1999058807 A1 WO1999058807 A1 WO 1999058807A1 GB 9901505 W GB9901505 W GB 9901505W WO 9958807 A1 WO9958807 A1 WO 9958807A1
Authority
WO
WIPO (PCT)
Prior art keywords
hole
guide device
drilling
cutting tool
engagement member
Prior art date
Application number
PCT/GB1999/001505
Other languages
English (en)
Inventor
Hector Fillippus Alexander Van Drentham-Susman
Kenneth Roderick Stewart
Original Assignee
Rotech Holdings Limited
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 Rotech Holdings Limited filed Critical Rotech Holdings Limited
Priority to AU40503/99A priority Critical patent/AU4050399A/en
Publication of WO1999058807A1 publication Critical patent/WO1999058807A1/fr

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
    • E21B37/00—Methods or apparatus for cleaning boreholes or wells
    • E21B37/02—Scrapers specially adapted therefor
    • 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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
    • E21B17/1014—Flexible or expansible centering means, e.g. with pistons pressing against the wall of the well
    • 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
    • E21B29/06—Cutting windows, e.g. directional window cutters for whipstock operations
    • 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
    • E21B7/06—Deflecting the direction of boreholes
    • E21B7/062—Deflecting the direction of boreholes the tool shaft rotating inside a non-rotating guide travelling with the shaft
    • 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
    • E21B7/06—Deflecting the direction of boreholes
    • E21B7/068—Deflecting the direction of boreholes drilled by a down-hole drilling motor

Definitions

  • the present invention relates to an active downhole cutting tool guide device for use in a hole with sides between which a hole-cutting tool provided with said device may be disposed.
  • the drilling apparatus 1 shown has an indexer 2 for angular orientation of the drill bit 3 via the drive system 4 therefor.
  • the drive system comprises motor 5, typically a oineau motor, a bent sub 7, and a bearing pack 8 which is connected to the drill bit 3.
  • the whole drill string comprising jointed tubing 9 from which the drilling apparatus 1 is supported is rotated at around 30 rpm so that the bent sub 7 rotates and the drill bit 3 orbits around the drill string axis while the motor 5 rotates at around 700 rpm to drive the drill bit 3 so that the drill bit 3 in effect follows a helical path.
  • the rotation of the drill string is stopped in an arbitrary position and the indexer 2 operated to orientate the bent sub 7 in the desired angular direction.
  • the motor 5 then drives the drill bit 3 while the drill string and bent sub 7 remain stationary, so that the drill bit 3 drills off at an angle determined by the bent sub 7.
  • the present invention provides in one aspect an active downhole cutting tool guide device for use in a hole with sides between which a hole-cutting tool mounted on a drill string and provided with said device may be disposed, said device comprising at least two elongate longitudinally extending hole-side engagement member mounted on a body disposable, in use of the device, in-line with the drill string, so as to be movable relative to said body between a retracted position and a radially outwardly displaced position for hole-side engagement, each said engagement member having pressurised-fluid operable actuator means formed and arranged for driving said hole-side engagement member between said retracted and hole-side engagement positions, said device including pressurised fluid supply means formed and arranged for controlling the supply of pressurised fluid, in use of the device, to said actuator means for operation thereof, whereby in use of the device a said hole-cutting tool may be directed relative to the central longitudinal axis of the hole in which said tool is disposed.
  • operation of the actuator means forces one or more of said engagement members into engagement with the hole-side i.e. the side of a borehole or of a casing lining a borehole.
  • the drill string will tend to be displaced away from the central longitudinal axis of the hole so that the cutting tool forward cutting direction can be steered away at an angle from -4- the previous forward cutting direction.
  • an equal force is exerted by each two or more symmetrically angularly distributed engagement members on the hole sides around the drill string, then the drill string is positively directed so that the existing forward cutting direction of the cutting tool is stabilised.
  • At least two, preferably at least three, angularly distributed, e.g. two diametrically opposed, engagement members may be used so that when their actuator means are operated simultaneously, the existing drill string direction is stabilised against deviation, for example by an asymmetrical obstruction to the cutting tool.
  • This is particularly useful when re-boring holes which have become obstructed to a greater or lesser degree e.g. by the formation of deposits therein, or by deformation of the casing which could have arisen, for example, as a result of shifts in the surrounding strata.
  • control of the angular orientation of the guide device with its engagement members will not normally be required.
  • the guide device could be used in conjunction with an indexing means which is a well known remotely operable device used to set the angular orientation of a tool on drill string to control the angular orientation of the guide device and hence of the engagement members around the well prior to operation of the actuator means so that the cutting tool is forced against the hole-side at desired angular parts of the hole-side.
  • an indexing means which is a well known remotely operable device used to set the angular orientation of a tool on drill string to control the angular orientation of the guide device and hence of the engagement members around the well prior to operation of the actuator means so that the cutting tool is forced against the hole-side at desired angular parts of the hole-side.
  • the pressurised fluid supply means includes valve means formed and arranged for controlling the relative supply of pressurised fluid to the various actuator means, said valve means having telemetric control signal receiving means formed and arranged for receiving valve control signals from a remote location, and valve actuation means coupled to said receiving means and formed and arranged for operation of said valves means in response to said valve control signals.
  • a further advantage of the invention is that by using variable opening valve and pressure control and/or more or less rapid toggling of the valves, the present invention allows the possibility of effectively adjusting the angle of kick off and rate of deviation from the drill string axis and an existing drilling line which is not possible with conventional apparatus in which the bent sub has a fixed predetermined offset angle which provides only a fixed rate of deviation (angle for given forward movement) .
  • pressurised fluid supply means may be used in accordance with the present invention depending inter alia on the requirements of the particular guide device application.
  • the pressurised fluid supply means comprises separate chambers for each actuator means for each hole side engagement member, which -6- chambers are connected to the high and low pressure sides of the downhole motor and drill string via control valves.
  • This type of arrangement could also, in principle, be used for other applications. More conveniently though somewhat simpler arrangements may be used where selective control of individual engagement members is not required as, for example, in stabilisers and in single engagement member applications such as window milling apparatus.
  • the pressurised fluid supply means may simply comprise a connection to the upstream side of restricted outlet drilling fluid exhaust passages at the cutting tool bit.
  • a motor driving the cutting tool will normally be run more or less continuously so that some back pressure is always available in the exhaust passages.
  • the exhaust passage outlets in cutting faces of the cutting tool so that these outlets are occluded to a greater or lesser extent when the cutting tool is in engagement with material to be cut, it will be appreciated that the back pressure is significantly increased during cutting so that the actuator means then operate to drive the engagement member into hole side engagement thereby automatically providing stabilisation of the drilling line just when it is needed.
  • pressurised fluid supply means and/or actuator means -7- and/or any engagement member return means will be formed and arranged so that the engagement members are retained in a substantially retracted position at fluid supply pressures corresponding to free or no-load running of the cutting tool drive motor, and are only displaced outwardly at higher fluid supply pressures corresponding to cutting by the cutting tool.
  • pressurised fluid supply means may be used in accordance with the present invention.
  • the device of the invention makes use of a drilling fluid flow passed down the drill string for one reason or another, typically drilling fluid exhausted from a positive displacement motor used to drive the hole cutting tool.
  • a separate by-pass fluid flow passage running in parallel with the fluid flow through the motor could be provided for supplying the guide device.
  • the guide device of the present invention may be used with various kinds of down-hole motors but is generally used with a positive displacement motor.
  • the guide device could in principle be used with a conventional Moineau motor, it is most preferably used with a rolling vane motor of the kind described in US Patent No 5,518,379.
  • the actuator means are formed and arranged so that when the pressure of the fluid supply is increased, the actuators operate to drive the engagement member (s) from their -8- retracted position to their radially outwardly displaced position.
  • the device includes resilient biasing means formed and arranged for returning the engagement member (s) to their retracted position when the fluid pressure is reduced again.
  • the actuator means are in the form of piston means mounted in cylinder means provided in said body of the guide device with a proximal end face in communication with said pressurised fluid supply and a distal end in driving abutment with a respective engagement member.
  • the pressure of the fluid flow to which the actuator means is subjected may be controlled in various ways known in the art including, for example, suitable telemetrically controlled valve means which may be operated so as to increase and reduce flow resistance downstream of the actuator means and hence back pressure whereby the fluid pressure acting on the actuator means may be varied.
  • suitable telemetrically controlled valve means which may be operated so as to increase and reduce flow resistance downstream of the actuator means and hence back pressure whereby the fluid pressure acting on the actuator means may be varied.
  • the actuator means are in communication with a fluid flow passage means which exhausts at the cutting tool, especially at a cutting surface thereof .
  • the operation of the actuator means can in such cases be substantially self-regulating with an increased displacement force being applied by the actuator means to the engagement -9- member(s) as increased resistance to cutting (from the material being cut through) is experienced which is when the strongest guiding force is required i.e. the engagement members require to be forced more powerfully against the hole sides.
  • the motor speed will begin to fall which results in a reduced fluid flow through the cutting tool which in turn results in a lower back pressure and thus reduced pressure at the actuator means .
  • the guide device of the invention provides a further degree of self-regulation and a still further advantage over the prior art .
  • a required displacement force to be applied to the engagement member (s) may be derived from a given fluid pressure.
  • the fluid pressure at the actuator means is 150 to 200 psi (10 to 14 bar) when the cutting tool is running free and back pressure from the fluid outlets in the cutting tool is at a minimum, rising to 600 to 700 psi (41 to 48 bar) when the cutting tool is fully engaged with material being cut.
  • each engagement member is provided with a separate respective pressurised fluid supply chamber to allow independent control of the engagement members via a CMWD device (e.g. for directional drilling)
  • the chambers are alternately connected to the high pressure and low pressure sides of the drill motor and drill string which would -10- typically have a pressure differential of the order of 1200 to
  • the present invention provides a stabilised hole reboring apparatus suitable for use in reboring an asymmetrically obstructed hole, which apparatus comprises a rotary drilling bit, motor means for driving the drilling bit, and a guide device of the invention having at least two substantially symmetrically driven engagement members for stabilising the drilling bit against lateral deviation in use of the apparatus as it cuts through an obstruction.
  • the present invention also provides a method of reboring an asymmetrically obstructed hole comprising the steps of: providing a stabilised hole reboring apparatus of the invention; placing the stabilised hole reboring apparatus inside the asymmetrically obstructed hole; operating the actuator means of the cutting tool guide device so as to forcibly engage the hole sides above an obstruction thereby stabilising the drilling bit against lateral deviation; and driving the stabilised drilling bit so as to cut through the obstruction.
  • the present invention provides a directional drilling apparatus suitable for use in directional drilling, which apparatus comprises a rotary drilling bit, motor means for driving the drilling bit, and a guide device of the invention having at least three angularly distributed independently driven engagement members operable for directing the drilling bit away from an existing drilling axis.
  • the present invention also provides a method of directional drilling comprising the steps of: -11- providing a directional drilling apparatus of the invention; placing the directional drilling apparatus inside a hole; independently operating the actuator means of the respective engagement members of the cutting tool guide device so as to forcibly engage the hole sides so as to direct the drilling bit in a desired direction; and driving the directed drilling bit so as to bore a hole along a desired path.
  • the actuator means for the respective engagement members may be independently operated by means of telemetric control.
  • Various suitable kinds of telemetry are well known in the art. Conveniently there may be used so-called mud pulse telemetry in which the pressure applied to the drilling mud flow passed down the drill string has superimposed thereon a more or less rapidly changing pressure signal which is used to transmit data via a suitable pulse code containing synchronisation pulses and data bit pulses.
  • Such telemetry means may also be used to monitor the drilling direction during the course of drilling using conventional MWD (measurement while drilling) techniques to facilitate accurate control of the guide device and thereby of the drilling direction.
  • a further particular advantage of the directional drilling guide device of the present invention is that it may be used with coiled tubing which has considerable operational advantages over conventional jointed tubing in downhole operations .
  • the actuator means are in the form of piston means mounted in cylinder means provided in said body of the guide device with a proximal end face in communication with said pressurised fluid supply and a distal end in driving abutment with a respective engagement member.
  • FIG. 1 is a schematic elevation of a conventional directional drilling apparatus
  • Fig. 2 is schematic side elevation of a drilling apparatus with a directional drilling guide device of the invention
  • Fig.3 is sectional side elevation of the guide device and drill bit of the embodiment of Fig.2;
  • Figs .4 and 5 are transverse sections of the guide device of
  • Fig.6 is a sectional side elevation of a stabiliser guide device and drill bit of a hole clearing apparatus of the invention
  • Figs.7 and 8 are transverse sections of the guide device of Fig.6;
  • Fig. 9 is a detail section corresponding to part of Fig.3 of a modified apparatus.
  • Fig. 2 shows a drilling apparatus 10 mounted at the end of a coiled tubing 11 and comprising a MCWD (Measurement & Control While Drilling) device 12 above a positive displacement rolling vane motor 13 (similar to that of US Patent No 5,518,379), below which is mounted a guide device 14 and a drilling bit 15.
  • the MCWD device 12 has a set of telemetrically controlled valves 16 which toggle connection of the high pressure and low pressure sides of the drill motor 13 and drill string via fluid flow pipes 18 to respective chambers of the guide device 14 as further explained hereinbelow.
  • the guide device 14 comprises a central, generally octagonal section, body 19 having four elongate hole side engagement members 20 captively secured thereto by bolts 21.
  • Each said engagement member 20 is provided with an -13- actuator means in the form of a series of pistons 22 mounted in cylinder bores 23 in the body 19 with a distal end 24 located in a blind hole 25 in the base 26 of the engagement member 20 in abutment with the engagement member 20, and a proximal end 27 inside a pressurised fluid supply chamber 28.
  • Return coil spring means 29 are mounted around the captive securing bolts 21 for biasing the engagement members 20 radially inwardly into their retracted positions.
  • the return springs tend to force the pistons 22 back into the chambers 28, draining any excess fluid therein back into the low pressure side of the drill string.
  • fluid pressure is increased inside the chambers 28 (by toggling the control valves 16 of the MCWD device 12 to connect to the high pressure side of the drill motor and drill string)
  • the pistons 24 are displaced radially outwardly against the force of the return springs 29 into engagement with the sides of the well hole 17 as shown in the drawings.
  • the engagement members 20 are all shown equally displaced corresponding to equal opening of the control valves 16. This arrangement provides good stabilisation against lateral deviation.
  • control valves 16 are operated unequally by means of specific telemetric control instructions, so that at least one chamber 28 has a greater fluid pressure and the corresponding engagement member 20 is subjected to a greater driving force, than at least one other neighbouring chamber 28 and engagement member 20, whereby the engagement members 20 are displaced asymmetrically around the device with the result that the central axis of the guide device body 19 and hence of the drill bit 15 connected thereto is offset from the central axis of the well hole 17 above the drill bit 15 whereby the drill bit kicks off along a new drilling line at an angle to the existing one.
  • the guide device of -14- the present invention offers a high degree of control and flexibility in relation to the kick off angle.
  • the apparatus required for directional drilling in accordance with the present invention are considerably simpler in construction and ease of operation than conventional apparatus, with the need for bent subs, gear boxes, and extra motors being avoided.
  • the present invention allows conventional indexing means to be dispensed with, although it is also possible to use a guide device of the invention in combination with a conventional indexing means if desired.
  • the guide devices of the apparatus of Figs 6 to 8 are similar in a number of respects to that of Figs 2 to 5 , and like parts are indicated by like reference numbers .
  • there is no need for independent control of different engagement members 20 so that there is no requirement for independent pressurised fluid supply chambers with associated fluid flow control, the or each engagement member being subjected to just one fluid pressure at any given time.
  • the stabiliser device 29 shown in Figs 6 to 8 the engagement members 20 are all displaced equally and symmetrically whereby the central axis of the body 19 is stabilised in line with the central axis of the hole 17 therearound and against lateral deviation upon the hole clearing bit 30 coming into engagement with an asymmetrical obstruction 31 at one side of hole 17.
  • Fig.9 shows a modified embodiment in which the solid pistons 22 slidably mounted in the body 19 acting against the engagement member 20 in the apparatus of Fig.3 are replaced by tubes 32 fixedly mounted in bores 33 in the body 19 with an open distal end 34 slidably received inside a blind hole 25 in the base 26 of the engagement member 20 and an annular seal 35 between the outside wall 36 of the tube distal end 34 and the -15- inside wall 37 of blind hole 25.
  • pressurized fluid passes through the tubes 32 into the blind holes 25 acting against the end face 38 thereof to urge the engagement member 20 radially outwardly. ... (?)... (?) .

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (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)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)

Abstract

L'invention concerne un dispositif actif de guidage (14) d'un outil de forage pour trou de sonde (17) présentant des parois latérales entre lesquelles un instrument de forage (15) monté sur un train de sonde et équipé dudit dispositif peut être disposé. Le dispositif de guidage (14) comprend au moins deux éléments allongés longitudinaux (20) en contact avec la paroi latérale du trou de sonde. Ces éléments sont montés sur un corps (19) remplaçable si bien que, pendant l'utilisation du dispositif, ils s'alignent sur le train de sonde de manière à se déplacer relativement audit corps (19) entre une position rentrée et une position radialement décalée vers l'extérieur, pour assurer un contact avec la paroi latérale du trou de sonde. Chaque élément de contact (20) est équipé d'un moyen de commande (24) fonctionnant par fluide pressurisé, conçu et configuré pour déplacer ledit élément de contact (20) entre sa position rentrée et sa position de contact avec la paroi latérale du trou de sonde. Le dispositif de guidage (14) comprend en outre un moyen d'alimentation en fluide pressurisé (18, 28) conçu et configuré pour contrôler l'injection de fluide pressurisé dans le moyen de commande (24) et le faire fonctionner. Pendant l'utilisation du dispositif de guidage (14), l'instrument de forage (15) peut être orienté relativement à l'axe longitudinal central du trou de sonde (17) dans lequel l'instrument (15) est placé.
PCT/GB1999/001505 1998-05-13 1999-05-12 Dispositif de guidage WO1999058807A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU40503/99A AU4050399A (en) 1998-05-13 1999-05-12 Guide device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/078,071 US20010011591A1 (en) 1998-05-13 1998-05-13 Guide device
GBGB9810137.1A GB9810137D0 (en) 1998-05-13 1998-05-13 Guide device
GB9810137.1 1998-05-13

Publications (1)

Publication Number Publication Date
WO1999058807A1 true WO1999058807A1 (fr) 1999-11-18

Family

ID=26313654

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/001505 WO1999058807A1 (fr) 1998-05-13 1999-05-12 Dispositif de guidage

Country Status (4)

Country Link
US (1) US20010011591A1 (fr)
AU (1) AU4050399A (fr)
GB (1) GB9810137D0 (fr)
WO (1) WO1999058807A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2357101A (en) * 1999-12-10 2001-06-13 Baker Hughes Inc Simultaneous Drilling and Casing Of Wellbores
CN108590557A (zh) * 2018-04-23 2018-09-28 西华大学 一种液压式可重复打开收回的段铣器

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* Cited by examiner, † Cited by third party
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US6840336B2 (en) * 2001-06-05 2005-01-11 Schlumberger Technology Corporation Drilling tool with non-rotating sleeve
US7004263B2 (en) * 2001-05-09 2006-02-28 Schlumberger Technology Corporation Directional casing drilling
US6607045B2 (en) * 2001-10-10 2003-08-19 Donald Beyerl Steering apparatus
GB0312899D0 (en) * 2003-06-05 2003-07-09 Armell Richard A Downhole tool
GB2439661B (en) * 2003-11-26 2008-06-18 Schlumberger Holdings Steerable drilling system
GB2408526B (en) * 2003-11-26 2007-10-17 Schlumberger Holdings Steerable drilling system
GB2411415B (en) * 2004-02-24 2006-07-12 Lance Robinson Directional driving device
US8881846B2 (en) * 2012-12-21 2014-11-11 Halliburton Energy Services, Inc. Directional drilling control using a bendable driveshaft
CN107313739B (zh) * 2017-09-06 2020-07-17 成都百胜野牛科技有限公司 流体分隔装置、井道结构及石油或天然气的生产方法
CN110410037A (zh) * 2019-08-27 2019-11-05 阜宁县石油机械有限公司 一种套管刮削器

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE870383C (de) * 1951-10-26 1953-03-12 Walter Baum Verfahren und Vorrichtung zur Durchfuehrung von Bohrungen
US2637527A (en) * 1950-08-21 1953-05-05 Jr Joseph B Andrews Well drilling device
DE1483750B1 (de) * 1966-07-07 1970-07-02 Smith Ind Internat Inc Ausrichtelement fuer Tiefbohrgeraete
EP0377373A1 (fr) * 1988-12-30 1990-07-11 Institut Français du Pétrole Garniture pour forage à trajectoire contrôlée comportant un élément coude à angle variable et utilisation de cette garniture
DE4007907A1 (de) * 1989-03-13 1990-09-27 Transbor Proprietary Ltd Lenkvorrichtung fuer eine bohrerspitze in einem bohrloch
EP0459008A2 (fr) * 1990-06-01 1991-12-04 Eastman Teleco Company Outil de forage pour forage dirigé
US5238061A (en) * 1992-09-29 1993-08-24 Camco International Inc. Apparatus for rotating a bit in a well
GB2306985A (en) * 1995-11-07 1997-05-14 Hector Filippus Alexand Susman Improvements in milling

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2637527A (en) * 1950-08-21 1953-05-05 Jr Joseph B Andrews Well drilling device
DE870383C (de) * 1951-10-26 1953-03-12 Walter Baum Verfahren und Vorrichtung zur Durchfuehrung von Bohrungen
DE1483750B1 (de) * 1966-07-07 1970-07-02 Smith Ind Internat Inc Ausrichtelement fuer Tiefbohrgeraete
EP0377373A1 (fr) * 1988-12-30 1990-07-11 Institut Français du Pétrole Garniture pour forage à trajectoire contrôlée comportant un élément coude à angle variable et utilisation de cette garniture
DE4007907A1 (de) * 1989-03-13 1990-09-27 Transbor Proprietary Ltd Lenkvorrichtung fuer eine bohrerspitze in einem bohrloch
EP0459008A2 (fr) * 1990-06-01 1991-12-04 Eastman Teleco Company Outil de forage pour forage dirigé
US5238061A (en) * 1992-09-29 1993-08-24 Camco International Inc. Apparatus for rotating a bit in a well
GB2306985A (en) * 1995-11-07 1997-05-14 Hector Filippus Alexand Susman Improvements in milling

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2357101A (en) * 1999-12-10 2001-06-13 Baker Hughes Inc Simultaneous Drilling and Casing Of Wellbores
US6419033B1 (en) 1999-12-10 2002-07-16 Baker Hughes Incorporated Apparatus and method for simultaneous drilling and casing wellbores
GB2357101B (en) * 1999-12-10 2002-07-17 Baker Hughes Inc Apparatus and method for simultaneous drilling and casing wellbores
CN108590557A (zh) * 2018-04-23 2018-09-28 西华大学 一种液压式可重复打开收回的段铣器
CN108590557B (zh) * 2018-04-23 2020-03-24 西华大学 一种液压式可重复打开收回的段铣器

Also Published As

Publication number Publication date
US20010011591A1 (en) 2001-08-09
GB9810137D0 (en) 1998-07-08
AU4050399A (en) 1999-11-29

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