CN1171142A - Steerable drilling with downhole motor - Google Patents
Steerable drilling with downhole motor Download PDFInfo
- Publication number
- CN1171142A CN1171142A CN95197026.7A CN95197026A CN1171142A CN 1171142 A CN1171142 A CN 1171142A CN 95197026 A CN95197026 A CN 95197026A CN 1171142 A CN1171142 A CN 1171142A
- Authority
- CN
- China
- Prior art keywords
- motor
- hole
- longitudinal axis
- drill
- boring
- 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
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 23
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 11
- 238000002788 crimping Methods 0.000 claims description 21
- 230000003213 activating effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 241001074085 Scophthalmus aquosus Species 0.000 claims 1
- 230000001939 inductive effect Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Images
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
- 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
Landscapes
- 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)
- Earth Drilling (AREA)
- Drilling And Boring (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
A method is provided for creating a borehole in an earth formation using a drilling assembly comprising a drill string (5) extending into the borehole, a downhole motor (6) including a housing (7) and a drive shaft (8) for rotating a drill bit (9), which drive shaft has an inclined orientation relative to a longitudinal axis of the lower part of the drill string. The motor housing is connected to the lower part of the drill string in a manner so as to allow rotation of the motor housing about said longitudinal axis. The drilling assembly further comprises an electric motor (23) for rotation of the motor housing about said longitudinal axis and relative to the drill string. The method comprises drilling a substantially straight section of said borehole by inducing said electric motor to rotate the motor housing continuously about said longitudinal axis and relative to the drill string while the downhole motor is operated to rotate the drill bit.
Description
Method that the present invention relates in earth formation, hole and device.More specifically, the present invention relates to allow boring method and the device of the direction of control drill bit to the underground target area that requires with the boring assembly.Needing the typical case of this control drill bit direction to use is for example offshore drilling, wherein will be from the offshore platform to the earth formation in a plurality of positions in hydrocarbon-containifirst zone get out a plurality of wellholes of opening partially.The application that needs in addition to use the drill bit that can control direction comprises that the wellhole level of getting out or high inclination gets into this hydrocarbon-containifirst district.
EP-571045-A1 discloses a kind of method of holing in earth formation, use a boring assembly, comprise the drill set that extends in the hole, the motor of going into the well that comprises the driving shaft of a shell and rotary drill bit, this driving shaft has the longitudinal axis of relative drill set bottom that incline direction is arranged, motor case is connected with the drill set bottom around the mode that described longitudinal axis rotates to allow the boring assembly, and drill tool assembly comprises that also the control motor case is around the control device that rotate of described longitudinal axis relative to drill set.In this known method, use the motor of going into the well of shell, thereby when boring straightway, it is zero that elbow is transferred to angle of bend, and when boring curved section with adjustable elbow, the radian in hole that elbow is adjusted to bent angle and requirement is suitable.Before boring curved section, motor case rotates so that motor case is oriented in the azimuth direction of requirement relative to the angle step of drill set around the increment of selected quantity.
The purpose of this invention is to provide a kind of method of holing in earth formation, its motor case need not established can regulate elbow, and gets out curved section and straightway with the motor of going into the well.
Another object of the present invention provides a kind of boring assembly of holing in earth formation, its motor case need not established can regulate elbow, and gets out curved section and straightway with the motor of going into the well.
Therefore comprise by activating described control device according to method of the present invention making motor case, get out the step of the straightway in described hole continuously around described longitudinal axis and rotate the motor of going into the well of operation simultaneously with respect to drill set drill bit is rotated.The direction of the driving shaft of the inclination of the shell assurance motor of continuous rotation motor continuously changes thereby drill bit does not have preferential direction in the stratum.As a result, when shell rotates continuously, the straightway that bit drills is portalled.
Comprise a kind of boring assembly of in earth formation, holing according to boring assembly of the present invention, comprise the drill set that extends in the hole, a following hole motor, it comprises that a shell and one are used for the driving shaft of rotary drill bit, the longitudinal axis of the relative drill set Lower Half of the direction of this driving shaft tilts, motor case and drill set Lower Half connect into and make motor case to rotate around described longitudinal axis, the boring assembly comprises that also the control motor case is around described longitudinal axis and the control device that rotates relative to drill set, and the device of the straightway of drilling bore hole, it is to make motor case continuously around described longitudinal axis with rotate relative to drill set and operate the motor of going into the well simultaneously and make the drill bit rotation and the straightway of drilling bore hole by the actuation control dress.
Illustrate in greater detail the present invention with reference to the accompanying drawings, in the accompanying drawing:
Fig. 1 schematically shows the elevation of the bottom of the drilling well assembly that the inventive method uses.
Drilling well assembly shown in Fig. 1 puts in the hole 1 that forms in the stratum 3.The bottom of this assembly only is shown in Fig. 1, and this assembly comprises into the drill set of the boring of pipe 5 shapes, and its diameter is less, for example for about 50mm, manages 5 before in dropping to hole 1 and is stored on the spool that is positioned at ground surface to enclose roll form.When progress boring, pipe 5 debatching from the spool is got off, and drops to gradually in the hole 1.Pipe 5 is also referred to as pipe crimping, and is also referred to as " pipe crimping boring " with this pipe bit hole.The underground drilling motor 6 that has shell 7 is positioned at the lower end of drill tool assembly, and motor 6 drives the driving shaft 8 that has drill bit 9, when drilling well, at the bottom of the drill bit 9 incision holes in 11 the rock.The motor 6 of going into the well is hydraulic motors of Moineau type, and it is known in steerable drilling well.Driving shaft 8 and drill bit 9 are arranged to opposite shell 7, thereby the longitudinal axis 17 of the longitudinal axis 13 of the bottom of pipe crimping 5 and driving shaft 8 at angle 15. Longitudinal axis 13 and 17 has an intersection point 19 to be positioned at the place of the shell 7 that is lower than motor.The motor 6 of going into the well is provided with a plurality of stabilization 21 so that the bottom of drilling well assembly is stablized and is centered in the hole 1.
The motor 6 of going into the well links to each other with pipe crimping 5 by the motor 23 that shell 26 and output shaft 27 are arranged, and fixedlys connected with the lower end of pipe crimping 5 in the upper end of shell 25, and the upper end of the shell 7 of the lower end of output shaft 27 and the motor of going into the well is permanently connected.The output shaft 27 of motor 23 can rotate around the longitudinal axis of axle 27 relative to the shell 25 of motor 23.One hole (not shown) extends through motor 23 inside, and this hole provides the fluid course between the fluid inlet of the pipe crimping and the motor 6 of going into the well.Therefore, when pumping into drilling fluid by pipe crimping 5 and go into the well motor 6 with driving, the orifice flow of drilling fluid by motor 23 is to the import of the motor 16 of going into the well.Electric energy is supplied with motor 23 by the power line that extends through protection steel bushing 29 inside, and this steel bushing 29 is linked ground rigidly along pipe crimping 5.Link to each other with the power supply (not shown) of being controlled by suitable control system at ground supply line.Motor 23 also is provided with a direction indicator (not shown) so that the indication of the angle direction of output shaft 27, and the direction of the motor 6 of going into the well to be provided with respect to pipe crimping 5.On behalf of the signal of output shaft 27 directions, this direction indicator offer the operator on ground by the appropriate signal bundle of lines that extends through steel bushing 29.
In the normal running of drilling well assembly, following getting out is the hole portion of straight line substantially.Drilling fluid pumps into by pipe crimping 5, and the hole by motor 23 is to the fluid inlet of the motor 6 of going into the well.Thereby go into the well motor 6 of operation drives driving shaft 8 and drill bits 9.When motor 6 was gone into the well in operation, the control system on ground made power supply supply with motor 23 to electric energy, and the controlled speed of the output shaft 27 of motor 23 is rotated continuously, thereby the shell of the motor 6 of going into the well also rotates with same controlled speed.Therefore drill bit 9 rotates around two axis 13,17 in hole 1.Because drill bit 9 is around the rotation of axis 13, the direction of drill bit 9 in hole 1 continuously changes, and therefore do not have preferential direction to make drill bit 9 expand deep hole 1.Therefore, drill bit 9 gets out the straightway that points to along axis 13 substantially.Should notice that the skew with rectilinear direction can take place in the hole portion that gets out by this way if earth formation 3 is anisotropic or heterogeneous.But for example use the known method of telemetering method of measured hole 1 at regular intervals, and the curved section (as described below) that gets out one section weak point if desired just can be corrected this direction skew.
Get out a curved slot section after getting out a straight hole section, drilling well is following to be carried out.At first the control system supply of electrical energy operating motor 23 on ground make output shaft 27 around with hole 1 in the go into the well suitable selected angular turn of preferential direction of shell 7 of motor 6, this direction of motor case 7 determines to bore the direction that the curved slot section is carried out.In order to reach the direction that shell 7 requires, the direction indication that makes direction indicator output shaft 27 is provided for terrestrial operation person.After the direction that requires reached, motor 23 quit work, and made the fluid inlet that drilling fluid pumps into the motor of going into the well motor 6 work of going into the well so that rotating driveshaft 8 and drill bit 9 by pipe crimping 5 and motor hole 23.Therefore hole under the situation that drill bit 9 rotates in that the shell 7 of the motor 6 of going into the well is motionless.Because the longitudinal axis 13 of drill bit 9 relative drill bit assembly bottoms tilts, so the hole section of a bending is expanded deeply thereby gets out in hole 1 along the incline direction of drill bit 9.
When the direction of finding hole 1 is a direction along the process that requires, drilling well should be proceeded along rectilinear direction, and work again simultaneously continuously rotation motor shell 7 and operation of motor 23 gone into the well motor 6 so that drill bit 9 is rotated.In order to reach the target area in earth formation 3, the drilling operator can repeat said procedure and alternately get out straight hole section and curved slot section.
In drilling well, owing to the reaction torque that acts on the pipe crimping 5, the pipe crimping distortion, the degree of distortion depends on various factors, and diameter and wall thickness as pipe crimping are pressed in the weight on the drill bit, driving the go into the well fluid pressure of motor or the value of the frictional force between pipe crimping and hole wall.Replace above-mentioned operating motor determine the to go into the well direction of motor of passing through, torsional angle that can be by changing pipe crimping or by motor work with change combining of torsional angle determine the to go into the well direction of motor, changing torsional angle can be by for example regulating the weight that is pressed on the drill bit or regulating the go into the well pressure of drilling fluid of motor of driving and realize.
Replace shell, can operate hydraulic motor or any other suitable motor in order to control mode with the motor of going into the well of motor rotating drive drilling bit.
Best described control device does not comprise the control motor case around the device of described longitudinal axis with respect to the rotation of drill set, this rotation be since in the hole reaction torque effect of rotary drill bit apply reaction torque power and form.
In sum, said method and system have used a pipe crimping, motor and control second motor that motor case rotates of going into the well of going into the well, and the drill set that this method and system need not rotate on ground, and can get out a straight hole section and a curved slot section.
Claims (14)
1. the method for a drilling bore hole in earth formation, use a boring assembly, comprise the drill set that extends in the hole, the motor of going into the well that comprises the driving shaft of a shell and rotary drill bit, this driving shaft has the longitudinal axis of relative drill set bottom that incline direction is arranged, motor case is connected with the drill set bottom around the mode that described longitudinal axis rotates to allow the boring assembly, drill tool assembly comprises that also the control motor case is around the control device that rotate of described longitudinal axis relative to drill set, described method comprises: make motor case continuously around described longitudinal axis and rotate the motor of going into the well of operation simultaneously with respect to drill set drill bit is rotated by activating described control device, get out the straightway in described hole.
2. according to the method for claim 1, the step and another curved section that bores described hole that it is characterized in that the hole of described brill straightway hocket, the curved section of described boring prevents motor case around described longitudinal axis and relative to the rotating of drilling tool by actuation control device, and the operation motor of going into the well rotates drill bit.
3. according to the method for claim 2, it is characterized in that: before boring described curved section step, activate described control device make motor case around with the angular turn of drill bit with respect to the predetermined direction in hole.
4. according to each method among the claim 1-3, it is characterized in that described control device does not comprise the described motor of control around described longitudinal axis with respect to the device of the rotation of drill set, this rotation is that the power that the reaction torque effect by rotary drill bit in the hole is applied to the moment of reaction on the motor case causes.
5. according to each method among the claim 1-4, it is characterized in that described control device comprises in the group of a hydraulic motor and a motor.
6. according to each method among the claim 1-5, it is characterized in that described drill set forms a pipe crimping on the spool, when boring was carried out, debatching was got off and is dropped in the hole on the pipe crimping upper drum.
7. boring assembly of in earth formation, holing, comprise the drill set that extends in the hole, a following hole motor, it comprises that a shell and one are used for the driving shaft of rotary drill bit, the longitudinal axis of the relative drill set Lower Half of the direction of this driving shaft tilts, motor case and drill set Lower Half connect into and make motor case to rotate around described longitudinal axis, the boring assembly comprises that also the control motor case is around described longitudinal axis and the control device that rotates relative to drill set, and the device of the straightway of drilling bore hole, it is to make motor case continuously around described longitudinal axis with rotate relative to drill set and operate the motor of going into the well simultaneously and make the drill bit rotation and the straightway of drilling bore hole by actuation control device.
8. according to the boring assembly of claim 7, it is characterized in that also comprising using preventing that motor case from rotating the motor of going into the well of operation simultaneously around described longitudinal axis with respect to drill set and drill bit being rotated and device that the step of the straightway of the step of the curved section of drilling bore hole and drilling bore hole replaces by activating described control device.
9. according to the boring assembly of claim 8, it is characterized in that also being included in get out curved section before, activate described control device and make the device of motor case around an angular turn suitable with respect to one of the hole selected direction with drill bit.
10. according to each boring assembly among the claim 7-9, it is characterized in that described control device does not comprise the control motor case around the device of described longitudinal axis with respect to the rotation of drill set, this rotation is because the moment of reaction power that the moment of reaction effect of rotation boring is applied on the motor case in the hole causes.
11., it is characterized in that described control device comprises in a group on hydraulic motor and the motor according to each boring assembly among the claim 7-10.
12. according to each boring assembly among the claim 7-11, it is characterized in that described drill set forms the pipe crimping around spool, assembly also is included in boring when carrying out, and pipe crimping debatching from spool is got off and drops to device the hole.
13. with reference to accompanying drawing such as above-mentioned method.
14. with reference to accompanying drawing such as above-mentioned boring assembly.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP94203712 | 1994-12-21 | ||
| EP94203712.8 | 1994-12-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1171142A true CN1171142A (en) | 1998-01-21 |
| CN1062634C CN1062634C (en) | 2001-02-28 |
Family
ID=8217472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95197026A Expired - Fee Related CN1062634C (en) | 1994-12-21 | 1995-12-20 | Steerable drilling with downhole motor |
Country Status (17)
| Country | Link |
|---|---|
| EP (1) | EP0799363B1 (en) |
| CN (1) | CN1062634C (en) |
| AR (1) | AR004469A1 (en) |
| AU (1) | AU692040B2 (en) |
| BR (1) | BR9510493A (en) |
| CA (1) | CA2207923C (en) |
| CO (1) | CO4480786A1 (en) |
| DE (1) | DE69509557T2 (en) |
| DK (1) | DK0799363T3 (en) |
| EG (1) | EG20620A (en) |
| MY (1) | MY115387A (en) |
| NO (1) | NO310036B1 (en) |
| OA (1) | OA10429A (en) |
| RU (1) | RU2149248C1 (en) |
| SA (1) | SA95160479B1 (en) |
| TN (1) | TNSN95131A1 (en) |
| WO (1) | WO1996019635A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101918672A (en) * | 2007-11-21 | 2010-12-15 | 普拉德研究及开发股份有限公司 | Drilling system |
| CN1926304B (en) * | 2004-01-27 | 2011-08-17 | 普拉德研究及开发股份有限公司 | Downhole drilling of a lateral hole |
| CN102325963A (en) * | 2009-02-20 | 2012-01-18 | 坎里格钻探技术有限公司 | Drilling scorecard |
| CN104838083A (en) * | 2012-12-19 | 2015-08-12 | 哈里伯顿能源服务公司 | Directional drilling using a rotating housing and a selectively offsetable drive shaft |
| CN105143589A (en) * | 2013-03-05 | 2015-12-09 | 国民油井华高有限合伙公司 | Adjustable bend assembly for a downhole motor |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5738178A (en) * | 1995-11-17 | 1998-04-14 | Baker Hughes Incorporated | Method and apparatus for navigational drilling with a downhole motor employing independent drill string and bottomhole assembly rotary orientation and rotation |
| US6047784A (en) * | 1996-02-07 | 2000-04-11 | Schlumberger Technology Corporation | Apparatus and method for directional drilling using coiled tubing |
| DE69940734D1 (en) | 1998-06-15 | 2009-05-28 | Brunob Ii Bv | IMPROVEMENT OF PLANTS AND THEIR PRODUCTS |
| US6446737B1 (en) * | 1999-09-14 | 2002-09-10 | Deep Vision Llc | Apparatus and method for rotating a portion of a drill string |
| DE19963445A1 (en) | 1999-12-28 | 2001-07-05 | Basf Ag | Process for the separation of formaldehyde from polyol-containing reaction mixtures with the addition of solvents |
| US6419014B1 (en) | 2000-07-20 | 2002-07-16 | Schlumberger Technology Corporation | Apparatus and method for orienting a downhole tool |
| US8720604B2 (en) | 2007-08-15 | 2014-05-13 | Schlumberger Technology Corporation | Method and system for steering a directional drilling system |
| US8763726B2 (en) | 2007-08-15 | 2014-07-01 | Schlumberger Technology Corporation | Drill bit gauge pad control |
| US8534380B2 (en) | 2007-08-15 | 2013-09-17 | Schlumberger Technology Corporation | System and method for directional drilling a borehole with a rotary drilling system |
| US8727036B2 (en) | 2007-08-15 | 2014-05-20 | Schlumberger Technology Corporation | System and method for drilling |
| US8066085B2 (en) | 2007-08-15 | 2011-11-29 | Schlumberger Technology Corporation | Stochastic bit noise control |
| US20100038141A1 (en) | 2007-08-15 | 2010-02-18 | Schlumberger Technology Corporation | Compliantly coupled gauge pad system with movable gauge pads |
| US8757294B2 (en) | 2007-08-15 | 2014-06-24 | Schlumberger Technology Corporation | System and method for controlling a drilling system for drilling a borehole in an earth formation |
| AU2009251533B2 (en) | 2008-04-18 | 2012-08-23 | Shell Internationale Research Maatschappij B.V. | Using mines and tunnels for treating subsurface hydrocarbon containing formations |
| AU2009303604B2 (en) | 2008-10-13 | 2013-09-26 | Shell Internationale Research Maatschappij B.V. | Circulated heated transfer fluid heating of subsurface hydrocarbon formations |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3423465C1 (en) * | 1984-06-26 | 1985-05-02 | Norton Christensen, Inc., Salt Lake City, Utah | Devices for alternative straight or directional drilling in underground rock formations |
| DE3839760C1 (en) * | 1988-11-25 | 1990-01-18 | Gewerkschaft Walter Ag | Double rotary drilling apparatus for making directionally accurate bores, in particular horizontal bores |
| US5022471A (en) * | 1990-01-08 | 1991-06-11 | Maurer Engineering, Inc. | Deviated wellbore drilling system and apparatus |
| GB9210846D0 (en) * | 1992-05-21 | 1992-07-08 | Baroid Technology Inc | Drill bit steering |
-
1995
- 1995-12-19 EG EG104595A patent/EG20620A/en active
- 1995-12-19 TN TNTNSN95131A patent/TNSN95131A1/en unknown
- 1995-12-19 AR ARP950100623A patent/AR004469A1/en unknown
- 1995-12-19 MY MYPI95003957A patent/MY115387A/en unknown
- 1995-12-20 CN CN95197026A patent/CN1062634C/en not_active Expired - Fee Related
- 1995-12-20 EP EP95943229A patent/EP0799363B1/en not_active Expired - Lifetime
- 1995-12-20 CO CO95060551A patent/CO4480786A1/en unknown
- 1995-12-20 RU RU97112381A patent/RU2149248C1/en not_active IP Right Cessation
- 1995-12-20 DK DK95943229T patent/DK0799363T3/en active
- 1995-12-20 WO PCT/EP1995/005163 patent/WO1996019635A1/en active IP Right Grant
- 1995-12-20 AU AU44357/96A patent/AU692040B2/en not_active Ceased
- 1995-12-20 BR BR9510493A patent/BR9510493A/en not_active IP Right Cessation
- 1995-12-20 CA CA002207923A patent/CA2207923C/en not_active Expired - Fee Related
- 1995-12-20 DE DE69509557T patent/DE69509557T2/en not_active Expired - Fee Related
- 1995-12-27 SA SA95160479A patent/SA95160479B1/en unknown
-
1997
- 1997-06-20 NO NO972878A patent/NO310036B1/en unknown
- 1997-06-20 OA OA70030A patent/OA10429A/en unknown
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1926304B (en) * | 2004-01-27 | 2011-08-17 | 普拉德研究及开发股份有限公司 | Downhole drilling of a lateral hole |
| CN101918672A (en) * | 2007-11-21 | 2010-12-15 | 普拉德研究及开发股份有限公司 | Drilling system |
| CN102325963A (en) * | 2009-02-20 | 2012-01-18 | 坎里格钻探技术有限公司 | Drilling scorecard |
| CN102325963B (en) * | 2009-02-20 | 2014-12-03 | 坎里格钻探技术有限公司 | Drilling scorecard |
| CN104838083A (en) * | 2012-12-19 | 2015-08-12 | 哈里伯顿能源服务公司 | Directional drilling using a rotating housing and a selectively offsetable drive shaft |
| CN104838083B (en) * | 2012-12-19 | 2017-06-23 | 哈里伯顿能源服务公司 | Using rotational shell and selectivity can offset drive shaft directed drilling |
| CN105143589A (en) * | 2013-03-05 | 2015-12-09 | 国民油井华高有限合伙公司 | Adjustable bend assembly for a downhole motor |
Also Published As
| Publication number | Publication date |
|---|---|
| MY115387A (en) | 2003-05-31 |
| CO4480786A1 (en) | 1997-07-09 |
| CA2207923A1 (en) | 1996-06-27 |
| SA95160479B1 (en) | 2005-06-14 |
| NO972878L (en) | 1997-06-20 |
| EP0799363B1 (en) | 1999-05-06 |
| RU2149248C1 (en) | 2000-05-20 |
| CA2207923C (en) | 2006-05-16 |
| AU692040B2 (en) | 1998-05-28 |
| CN1062634C (en) | 2001-02-28 |
| NO310036B1 (en) | 2001-05-07 |
| EP0799363A1 (en) | 1997-10-08 |
| AU4435796A (en) | 1996-07-10 |
| WO1996019635A1 (en) | 1996-06-27 |
| DE69509557T2 (en) | 1999-11-04 |
| TNSN95131A1 (en) | 1996-02-06 |
| AR004469A1 (en) | 1998-12-16 |
| DE69509557D1 (en) | 1999-06-10 |
| DK0799363T3 (en) | 1999-11-15 |
| MX9704585A (en) | 1997-10-31 |
| OA10429A (en) | 2002-03-21 |
| BR9510493A (en) | 1998-01-13 |
| NO972878D0 (en) | 1997-06-20 |
| EG20620A (en) | 1999-09-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1062634C (en) | Steerable drilling with downhole motor | |
| US4492276A (en) | Down-hole drilling motor and method for directional drilling of boreholes | |
| EP0103913B1 (en) | Down-hole motor and method for directional drilling of boreholes | |
| CA1157005A (en) | Tool for drilling curved sections of well holes | |
| EP0441890B1 (en) | Directional drilling apparatus and method | |
| US7188685B2 (en) | Hybrid rotary steerable system | |
| US5050692A (en) | Method for directional drilling of subterranean wells | |
| CA2213713C (en) | Downhole tool | |
| US6269892B1 (en) | Steerable drilling system and method | |
| EP0085444B1 (en) | Method and means for controlling the course of a bore hole | |
| US5148877A (en) | Apparatus for lateral drain hole drilling in oil and gas wells | |
| CA2096192C (en) | Drilling short radius curvature well bores | |
| EP0571045A1 (en) | Directional drilling with downhole motor on coiled tubing | |
| US8307914B2 (en) | Drill bits and methods of drilling curved boreholes | |
| US11434696B2 (en) | Directional drilling systems and methods | |
| US20120031677A1 (en) | Directional wellbore control by pilot hole guidance | |
| RU2114273C1 (en) | Method and device for drilling slant-directed bore-holes | |
| GB2343470A (en) | Eccentrically weighted drilling apparatus for deviated boreholes | |
| CA1235686A (en) | Apparatus for optional straight or directional drilling underground formations | |
| MXPA97004585A (en) | Orientable drilling with motor located in the drilling fund or p | |
| TH17989B (en) | Turnable drilling with bottom drilling motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |