EP0201398A1 - Einheit, die das Richtbohren erlaubt - Google Patents

Einheit, die das Richtbohren erlaubt Download PDF

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Publication number
EP0201398A1
EP0201398A1 EP86400879A EP86400879A EP0201398A1 EP 0201398 A1 EP0201398 A1 EP 0201398A1 EP 86400879 A EP86400879 A EP 86400879A EP 86400879 A EP86400879 A EP 86400879A EP 0201398 A1 EP0201398 A1 EP 0201398A1
Authority
EP
European Patent Office
Prior art keywords
column
deflector
flexible
assembly according
tool
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.)
Granted
Application number
EP86400879A
Other languages
English (en)
French (fr)
Other versions
EP0201398B1 (de
Inventor
Jean Thiery
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.)
IFP Energies Nouvelles IFPEN
Original Assignee
IFP Energies Nouvelles IFPEN
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 IFP Energies Nouvelles IFPEN filed Critical IFP Energies Nouvelles IFPEN
Publication of EP0201398A1 publication Critical patent/EP0201398A1/de
Application granted granted Critical
Publication of EP0201398B1 publication Critical patent/EP0201398B1/de
Expired legal-status Critical Current

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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
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
    • 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 longitudinal forces of thrust or traction between the main flexible and the drilling tool can be transmitted via the central core constituted by the internal centering body and the deflector and by two axial pivotings arranged respectively at the head and at the foot of this central core.
  • Appropriate conduits at the foot of the main hose, as well as flexible bellows insulation around the deflector, can ensure that between the head of the centering module and the tool, the circulation of drilling mud takes place only in the central part of the device, and that all the radial and axial pivots work in a clean environment lubricated by oil.
  • the present invention allows the optimization of the transmission of thrust and torque from the vertical section of the packing to the drilling tool, through the flexible lower column.
  • the reference 1 designates a geological formation in which a horizontal drain 2 must be drilled.
  • the distance L6 designates the distance separating the surface well 3 from plumb with the start of the horizontal drain 2 to be drilled in the case of the implementation of conventional conventional drilling techniques.
  • the present invention allows precise control of the trajectory of a borehole and makes it possible to rectify it almost instantaneously with a minimum of delay, this thanks to the control and control at all times of the positioning of the tool in the well.
  • the present invention makes it possible to vary the radius of the curve of the trajectory of the drilled well by a large range.
  • the vertical packing may be rigid.
  • This flexible joint forms an extension of the drive column.
  • the axes 202 and 203 are substantially concurrent at a point A and form between them a deflection angle a.
  • the reference 7 designates a deviation and measurement instrument.
  • This instrument comprises a variable angle bend or deflector 8 located inside the lower end of a flexible joint 9 forming a flexible extension of the drive column, immediately behind the tool 6; the radial or polar orientation of this elbow 8 is controlled by a flexible polar orientation column 10 at least on its lower part.
  • This column is substantially coaxial with the flexible joint 9, itself connected to a main drive hose 11, possibly extended to the surface by a rigid extension.
  • the assembly comprising the flexible joint, the main drive hose and the rigid extension constitute a column for driving the tool in rotation, likewise, the assembly comprising the flexible joint and the main drive hose for - will be qualified as a flexible part of the drive column.
  • the axis around which the lower end of the drive column rotates it is the axis of the lower end of the main hose.
  • the bend or deflector 8 makes it possible to print radial deviations from the tool 6 in determined controllable directions, resulting in different degrees of curvature, or in straightness, of the well profile and in controlling its azimuth.
  • This external centering body 15 may include lower 115 and upper 116 centering shoes.
  • the probe 12 can measure the radial or polar orientation of the deflector with respect to the high generatrix of the hole or with respect to magnetic north (in Anglo-Saxon term " tool face "), to allow this radial orientation to be maintained or corrected, by surface action on the orientation column.
  • a semi-rigid metallic membrane 28 connects the upstream 29 and downstream 30 elements of the toggle 16 around the deflector 8; this membrane may be formed by a metal bellows.
  • the thrust transmission from the main hose 11 to the tool-holder endpiece 32 can preferably be done through the extension of the orientation column 14 and the deflector 8 via the upstream axial stops 24 and downstream 25.
  • the joint flexible 9 will not have to support this thrust, It however supports rotation. torque, and flexion combined. generators of fatigue effects: consequently, this flexible joint 9 can be considered as a wearing part which it is allowed to replace periodically.
  • the axial stop 24 may be placed substantially in the vicinity of the radial stop 22. In this case the transmission of the axial thrust to the tool will be done via the centering module 15 instead of being done via the extension 14 of the orientation column.
  • the main hose 11 has, among other functions, that of transmitting to the tool 6 rotation, cutting, and axial thrust and of conveying the drilling mud towards the bottom. It must allow the ascent of the mud and the cuttings in the ring finger of the hole.
  • This main hose will preferably be designed to minimize the risks of differential bonding, it will have to resist the traction necessary to extract the lining from the drain with the possible help of rotation and circulation combined in case of jamming and finally it will preferably be easily storable and transportable on the surface.
  • main hose 11 may include a spiral outer rib 33 of polyamide loaded with reinforcing fibers - (aramid fibers, for example the fiber designated by "Kevlar” Dupont de Nemours), located on its outskirts.
  • reinforcing fibers - aramid fibers, for example the fiber designated by "Kevlar” Dupont de Nemours
  • the only function of the flexible column 10 is to transmit the orientation torque from the surface to the deflector 8 and to maintain this orientation during drilling. Its diametrical dimensions must spare, in its center, the passage of the electrical transmission cable 18 and, externally, an annular 34 sufficient in the main hose 11 for the passage of the downward flow of the drilling mud, indicated by the arrow 35.
  • This hose 10, permanently installed inside the main hose 11 will nevertheless be easily removable for inspection, maintenance and to allow, if necessary, access to the interior of the main hose 11 during operations (for example for unscrewing with explosive, in Anglo-Saxon terms "back-off", above the background instrument).
  • the electrical transmission cable 18, possibly a single conductor, can be permanently installed in the center of the orientation hose.
  • the lower part it is connected to the measurement probe 12, during the assembly of the main flexible assembly 11 - orientation hose 10 on the bottom instrument 7.
  • a connector 36 possibly a single contact, housed in the center of the combined end piece of main hose 11 and orientation hose 10.
  • the connection of cable 18 to probe 12 can be achieved by a connector 37.
  • the main hose 11 is extended to the surface by a main train 38 , optionally rigid, possibly consisting of drill rods 39 and conventional drill rods 40.
  • the flexible orientation 10 can be extended at the center of the main landing gear 38 by an orientation column 41, possibly rigid, consisting of rods conventional drilling type mining constant external diameter, commonly called “flush mining rod” by those skilled in the art.
  • the assembly comprising the orientation hose and the possibly rigid column constitutes the polar orientation column or more simply the orientation column.
  • the tool and bottom instrument assembly having been pre-assembled is placed on corners.
  • the main flexible assembly 11 - flexible orientation 10 - central cable 18, is connected to the bottom instrument 7 and then lowered, by unwinding from the storage drum 44 - (FIG. 5) of the flexible assembly, up to to be installed on the corners of the upper combined nozzle.
  • the flexible orientation column 10 is then extended to the surface by introduction, screwing, and successive descent of sections of mining rods with constant external diameter, commonly called mining rod "flush" by the skilled person, and constituting the column upper orientation 41 (fitting for connections on a wedge box installed on the top of the upper main rod).
  • the extension 50 of the electric cable is then introduced into the center of the column and lowered by unwinding: a possibly single-contact plug 36, at its foot, ballasted with a load bar, is connected, for example, by simple fitting, at the end of the descent , on the head plug of the flexible assembly
  • the total length of the cable may, depending on the depth of the well, be made up of several sub-sections, and may have a significant excess length compared to the length of the rigid train.
  • the cable extension ends with a plug, possibly a single contact, 52 which comes to rest in a support end piece at the top of the upper rod of the orientation column.
  • a set of two paired sections of main rods 54 and orientation 55 is prepared in the rat hole (in English term "rat hole"), the bottom of the latter being arranged so that the mining rod 55 is offset, upwards, relative to the main rod, for example 0.2 meters.
  • the motorized injection head 59 (in Anglo-Saxon terms “power swivel”), with its screwing tip on the rods and driving the drill train in rotation, is provided with an upper column extension 60 orientation 41, entered in the orienter 43 of "tool face", analogous to a small caliber hydraulic wrench.
  • the orienter 43 is supported by a jack 61 with vertical clearance which can be approximately 0.5 meters, itself anchored on the frame of the motorized head 42.
  • a cable gland 62 with hydraulic control (of the lubricator type “snubbing" "), above the" power swivel ", allows sealing on the upper extension (outside polished chrome) of the orientation column.
  • the upper extension 60 of the orientation column is permanently fitted with the upper extension of the electric cable, terminated in the lower part by a single-contact plug, and in the upper part by a rotary contact 65. Above this rotary contact, the cable surface follows the mud injection hose, and is connected to the equipment for receiving surface measurements and the deflector's remote control.
  • the upper extension 60 of the orientation column is positioned to protrude under the nozzle of the injection head, for example 0.1 meter, while the support cylinder is in the middle position.
  • the injection head 42 is brought to the vertical of the rat hole and positioned using the muffle to locate the foot of the upper extension 60 of the orientation column above the mining rod 55, for example at 10- 15 cm.
  • the upper extension 60 is then approached then engaged and screwed onto the mining rod 55 by combining the rotation of the orienter 43 and the translation of its support cylinder 61, which allows a fine approach and avoids the risks of deterioration of the mining rod threads 55.
  • the electrical cable connection 56 is established simultaneously.
  • the bio-cage is made at the maximum admissible torque for threading, a torque which can be automatically measured by the guide 43 or applied by keys.
  • the jaws of the orienter 43 are then loosened and separated from the upper extension 60 of the orientation column.
  • the injection head 42 is lowered using the muffle and the nozzle of the injection head is engaged and screwed onto the main rod 54 by rotation of the head. Locking can be completed with conventional keys.
  • the support cylinder 61 is put in the high position.
  • the orienting jaws 43 are tightened on the upper extension 60.
  • the set of addition rods 53 thus connected to the injection head is extracted from the rat hole and brought with the aid of the muffle above the drilling train 38 on standby on corners 46, 47, maintaining a space between main rod 45 on corners and main adding rod 54, this space may be approximately 0.5 meters.
  • the upper extension 60 of the orientation column 41 is lowered and approached then connected to the orientation column on standby in the drilling train 38 by actions of the orienter 43 and its support jack 61.
  • the orienting jaws are loosened, and the main adding rod 53 is approached and connected to the main landing gear 38 on corners 46, 47 by actions of the muffle and of the injection head, the blocking can be completed by the keys .
  • the support cylinder 61 is positioned for setting the orientation column 41 under tension under its own weight (slight sliding possible of the sliding fitting at the foot of the column).
  • the cable gland 62 is closed on the upper orientation extender.
  • each addition 53 can be made by sections of 2 or 3 rods of 9 meters, or by 27 meters: there will therefore be 11 to 18 additions to operate for a drain of 300 to 500 meters.
  • the movement for driving the tool comes from a downhole motor (see FIG. 6).
  • the main hose 11 is rotated by a downhole motor 66, preferably of the volumetric type connected at the head of the flexible train 11.
  • This motor 66 is used in the inverted position relative to the conventional mode: it is the external body 67, normally stator, which is connected to the main flexible 11 and which becomes the rotor or rotating element.
  • the central shaft 68 With lobes, becomes stator: the end piece 70, normally a tool holder, of this central shaft 68 is in the upper position, and connected to the drill set 69 and conventional stems rising to the surface .
  • the other, normally free, end 71 of the central shaft 68 is connected to the orientation hose 72: the latter can therefore be oriented by action on the upper rod train 73 which, apart from the orientation movements, remains stationary angularly.
  • the central shaft 68 of the downhole motor as well as its extension in its pivoting and its precession gimbals may be arranged to provide a central passage in which is housed an extension 75 of the electrical transmission cable 74. This passage may be cylindrical and have a diameter of about 1/2 ".
  • the electrical connection to the surface is formed by an optionally monoconductive cable 77, connected in the lower part to the extender 75 in the engine, by an optionally monocontact plug which can be ballasted with a load bar.
  • It may include a first section of cable of ad-hoc length, introduced in the center of the assembled rods when the tool is near the bottom of the hole before drilling begins, plus a complement of cable "wire line" in the center rods, connected to the previous one by possibly single contact plug surmounted by a load bar, and exiting at the head of the rod train through a cable gland, this additional cable therefore having to be operated during each addition.
  • the cable will have to be maneuvered 11 to 18 times in total if the additions are made in triplicate, using an injection head.
  • rod elements grouped in groups of three for additions each group being fitted with a central cable with end plugs, possibly single contact, permanently installed.
  • each rod element is equipped with a central cable with plug.
  • the rotary drilling embodiment has great flexibility in adapting rotation speeds and torques to terrain and drilling conditions. There is no limitation in maximum torques other than that imposed by the resistance limits of the rods. So the capacity to fight against conditions of jamming or intense friction is high.
  • Such an embodiment allows complete independence of the mechanical parameters of the drilling and of the mud flow rates and pressures.
  • the entire electrical connection between the bottom and the surface is done without mud which, according to the embodiment described as rotary drilling, facilitates the obtaining and maintenance of good electrical insulation at the connections and eliminates the problems of Erosion and deterioration of cables in the mud flow.
  • the rotary embodiment avoids the problems linked to the cable placed in the annular of a well or to frequent cable maneuvers.
  • the embodiment according to the present invention qualified as rotary drilling allows, if necessary, in particular in the case of jamming impossible to solve by rotation-traction-circulation, to completely extract the central orientation column, including the flexible part, at the same time as the electric cable and the measuring probe, thus freeing the center of the main landing gear to the deflector and allowing the execution of an unscrewing with explosives and the possible recovery of most of the undercarriage, including all or part of the main hose, depending on the level of jamming.
  • this embodiment makes it possible, in the event of loss of circulation, to inject sticky products.
  • this embodiment has drawbacks relative to the downhole engine version which resides in particular in the relative complexity of the composition of the rigid drilling train as a whole and of its implementation. This is to be tempered, however, in consideration of the simplicity, classurgi, and robustness of the individual components of this drill string.
  • the embodiment according to the present invention which includes a downhole motor, has advantages relative to the so-called rotary version including, in particular, that of the simplicity of the composition of the rigid drilling train, and of its implementation.
  • the maximum torque that can be supplied by the downhole motor is necessarily limited. For example, with 9 lobe motors. currently available on the market, you can only count on 400 to 500 mkg.

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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)
EP86400879A 1985-05-07 1986-04-23 Einheit, die das Richtbohren erlaubt Expired EP0201398B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8507069 1985-05-07
FR8507069A FR2581698B1 (fr) 1985-05-07 1985-05-07 Ensemble permettant d'effectuer des forages orientes

Publications (2)

Publication Number Publication Date
EP0201398A1 true EP0201398A1 (de) 1986-12-17
EP0201398B1 EP0201398B1 (de) 1989-03-08

Family

ID=9319124

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86400879A Expired EP0201398B1 (de) 1985-05-07 1986-04-23 Einheit, die das Richtbohren erlaubt

Country Status (6)

Country Link
US (1) US4858705A (de)
EP (1) EP0201398B1 (de)
CA (1) CA1265122A (de)
DE (1) DE3662290D1 (de)
ES (1) ES8705078A1 (de)
FR (1) FR2581698B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0271933A1 (de) * 1986-12-17 1988-06-22 Hydro Soil Services Verfahren und Vorrichtung zum Bergen von auf dem Seeboden liegenden Gegenständen
FR2898935A1 (fr) * 2006-03-27 2007-09-28 Francois Guy Jacques Re Millet Dispositif d'orientation d'outils de forage

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FR2627649B1 (fr) * 1988-02-22 1990-10-26 Inst Francais Du Petrole Methode et dispositif de transmission de l'information par cable et par ondes de boue
US5220963A (en) * 1989-12-22 1993-06-22 Patton Consulting, Inc. System for controlled drilling of boreholes along planned profile
US5419405A (en) * 1989-12-22 1995-05-30 Patton Consulting System for controlled drilling of boreholes along planned profile
US4993503A (en) * 1990-03-27 1991-02-19 Electric Power Research Institute Horizontal boring apparatus and method
US5096002A (en) * 1990-07-26 1992-03-17 Cherrington Corporation Method and apparatus for enlarging an underground path
US5139094A (en) * 1991-02-01 1992-08-18 Anadrill, Inc. Directional drilling methods and apparatus
US5117927A (en) * 1991-02-01 1992-06-02 Anadrill Downhole adjustable bent assemblies
US5165491A (en) * 1991-04-29 1992-11-24 Prideco, Inc. Method of horizontal drilling
US5154243A (en) * 1991-07-26 1992-10-13 Dudman Roy L Bent sub
US5215151A (en) * 1991-09-26 1993-06-01 Cudd Pressure Control, Inc. Method and apparatus for drilling bore holes under pressure
US5209605A (en) * 1991-11-08 1993-05-11 Evi Cherrington Enviromental, Inc. Gravel-packed pipeline and method and apparatus for installation thereof
US5230388A (en) * 1991-11-08 1993-07-27 Cherrington Corporation Method and apparatus for cleaning a bore hole using a rotary pump
AU1321892A (en) * 1991-12-09 1993-07-19 Bob J. Patton System for controlled drilling of boreholes along planned profile
US5265687A (en) * 1992-05-15 1993-11-30 Kidco Resources Ltd. Drilling short radius curvature well bores
US5320179A (en) * 1992-08-06 1994-06-14 Slimdril International Inc. Steering sub for flexible drilling
US5297641A (en) * 1992-12-28 1994-03-29 Falgout Sr Thomas E Drilling deviation control tool
US5421420A (en) * 1994-06-07 1995-06-06 Schlumberger Technology Corporation Downhole weight-on-bit control for directional drilling
US5617926A (en) * 1994-08-05 1997-04-08 Schlumberger Technology Corporation Steerable drilling tool and system
US5484029A (en) * 1994-08-05 1996-01-16 Schlumberger Technology Corporation Steerable drilling tool and system
US5520256A (en) * 1994-11-01 1996-05-28 Schlumberger Technology Corporation Articulated directional drilling motor assembly
US5727641A (en) * 1994-11-01 1998-03-17 Schlumberger Technology Corporation Articulated directional drilling motor assembly
US5542482A (en) * 1994-11-01 1996-08-06 Schlumberger Technology Corporation Articulated directional drilling motor assembly
US6092610A (en) * 1998-02-05 2000-07-25 Schlumberger Technology Corporation Actively controlled rotary steerable system and method for drilling wells
US6158529A (en) * 1998-12-11 2000-12-12 Schlumberger Technology Corporation Rotary steerable well drilling system utilizing sliding sleeve
US6109372A (en) * 1999-03-15 2000-08-29 Schlumberger Technology Corporation Rotary steerable well drilling system utilizing hydraulic servo-loop
US7136795B2 (en) 1999-11-10 2006-11-14 Schlumberger Technology Corporation Control method for use with a steerable drilling system
US6601658B1 (en) 1999-11-10 2003-08-05 Schlumberger Wcp Ltd Control method for use with a steerable drilling system
CA2567855C (en) 1999-12-06 2009-09-08 Precision Drilling Corporation Coiled tubing drilling rig
US6536539B2 (en) 2000-06-30 2003-03-25 S & S Trust Shallow depth, coiled tubing horizontal drilling system
DE10149018B4 (de) 2001-10-04 2007-05-24 Tracto-Technik Gmbh Verfahren zum Richtungsbohren
US7188685B2 (en) 2001-12-19 2007-03-13 Schlumberge Technology Corporation Hybrid rotary steerable system
GB2405483B (en) 2002-05-13 2005-09-14 Camco Internat Recalibration of downhole sensors
US7730965B2 (en) 2002-12-13 2010-06-08 Weatherford/Lamb, Inc. Retractable joint and cementing shoe for use in completing a wellbore
US7938201B2 (en) 2002-12-13 2011-05-10 Weatherford/Lamb, Inc. Deep water drilling with casing
USRE42877E1 (en) 2003-02-07 2011-11-01 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
CA2651966C (en) 2006-05-12 2011-08-23 Weatherford/Lamb, Inc. Stage cementing methods used in casing while drilling
US8276689B2 (en) 2006-05-22 2012-10-02 Weatherford/Lamb, Inc. Methods and apparatus for drilling with casing
WO2012135188A2 (en) * 2011-03-28 2012-10-04 Taylor Mickal R Fluid-saving pump down tool
CN104114805B (zh) * 2012-02-17 2016-06-29 哈利伯顿能源服务公司 定向钻井系统
US9556677B2 (en) 2012-02-17 2017-01-31 Halliburton Energy Services, Inc. Directional drilling systems
US20240093623A1 (en) * 2021-06-16 2024-03-21 Radjet Services Us, Inc. Method and system for reducing friction in radial drilling and jet drilling operations

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US1850403A (en) * 1931-10-08 1932-03-22 Robert E Lee Mechanism for drilling angular channels
US2198016A (en) * 1938-08-18 1940-04-23 James C Rogers Lateral drill mechanism
BE865954A (fr) * 1978-04-13 1978-07-31 Foraky Perfectionnements aux installations de forage
BE865955A (fr) * 1978-04-13 1978-07-31 Foraky Perfectionnements aux installations de forage
DE3306405A1 (de) * 1983-02-24 1984-08-30 Manfred 2305 Heikendorf Schmidt Verfahren und vorrichtung von leitungsstraengen im erdreich
DE3412219A1 (de) * 1984-04-02 1985-10-10 Witte Bohrtechnik GmbH, 3060 Stadthagen Vorrichtung zum unterirdischen rohrvortrieb im bereich unbegehbarer rohrdurchmesser

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US2672321A (en) * 1948-12-10 1954-03-16 John A Zublin Apparatus for drilling oriented drain holes
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US3667556A (en) * 1970-01-05 1972-06-06 John Keller Henderson Directional drilling apparatus
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Publication number Priority date Publication date Assignee Title
US1850403A (en) * 1931-10-08 1932-03-22 Robert E Lee Mechanism for drilling angular channels
US2198016A (en) * 1938-08-18 1940-04-23 James C Rogers Lateral drill mechanism
BE865954A (fr) * 1978-04-13 1978-07-31 Foraky Perfectionnements aux installations de forage
BE865955A (fr) * 1978-04-13 1978-07-31 Foraky Perfectionnements aux installations de forage
DE3306405A1 (de) * 1983-02-24 1984-08-30 Manfred 2305 Heikendorf Schmidt Verfahren und vorrichtung von leitungsstraengen im erdreich
DE3412219A1 (de) * 1984-04-02 1985-10-10 Witte Bohrtechnik GmbH, 3060 Stadthagen Vorrichtung zum unterirdischen rohrvortrieb im bereich unbegehbarer rohrdurchmesser

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
REVUE DE L'INSTITUT FRANCAIS DU PETROLE, vol. 38, no. 1, janvier-février 1983, pages 63-81, Paris, FR; R. DESBRANDES et al.: "Récents développements en forage téléguidé" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0271933A1 (de) * 1986-12-17 1988-06-22 Hydro Soil Services Verfahren und Vorrichtung zum Bergen von auf dem Seeboden liegenden Gegenständen
FR2898935A1 (fr) * 2006-03-27 2007-09-28 Francois Guy Jacques Re Millet Dispositif d'orientation d'outils de forage
WO2007110502A1 (fr) 2006-03-27 2007-10-04 Millet Francois Dispositif d'orientation d'outils de forage

Also Published As

Publication number Publication date
DE3662290D1 (en) 1989-04-13
ES554695A0 (es) 1987-04-16
FR2581698B1 (fr) 1987-07-24
ES8705078A1 (es) 1987-04-16
FR2581698A1 (fr) 1986-11-14
EP0201398B1 (de) 1989-03-08
US4858705A (en) 1989-08-22
CA1265122A (fr) 1990-01-30

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