GB2172324A - Drilling apparatus - Google Patents

Drilling apparatus Download PDF

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Publication number
GB2172324A
GB2172324A GB08606518A GB8606518A GB2172324A GB 2172324 A GB2172324 A GB 2172324A GB 08606518 A GB08606518 A GB 08606518A GB 8606518 A GB8606518 A GB 8606518A GB 2172324 A GB2172324 A GB 2172324A
Authority
GB
United Kingdom
Prior art keywords
drilling
tube
pump
ofthe
drilling apparatus
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
GB08606518A
Other versions
GB8606518D0 (en
GB2172324B (en
Inventor
Gordon Douglas
Peter Allen
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.)
Cambridge Radiation Tech
Original Assignee
Cambridge Radiation Tech
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
Priority claimed from GB858506866A external-priority patent/GB8506866D0/en
Priority claimed from GB08517749A external-priority patent/GB2177738B/en
Application filed by Cambridge Radiation Tech filed Critical Cambridge Radiation Tech
Priority to GB08606518A priority Critical patent/GB2172324B/en
Publication of GB8606518D0 publication Critical patent/GB8606518D0/en
Publication of GB2172324A publication Critical patent/GB2172324A/en
Application granted granted Critical
Publication of GB2172324B publication Critical patent/GB2172324B/en
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
    • E21B17/10—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
    • 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

Landscapes

  • 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

Drilling apparatus comprising a drilling tube (10) having a drilling bit (12). The tube (10) is deflected by a lateral force which imparts to the tube (10) a curvature, thereby to control the drilling direction. The lateral force is applied by selectively pressurising four flexible actuator bags (42) arranged around the drilling tube (10), the bags being pressurised to a controllable extent in order to provide a controllable magnitude and direction to the lateral face. Hydraulic pressure for the bags (42) is generated by a pump which comprises a further flexible bag (60) (Figure 4), similar to the bags (42), and an eccentric sleeve (58) which rotates with the drilling tube (10) and which causes the pump bag (60) to be cyclically compressed and then relieved of pressure. The four actuator bags (42) and the pump bag are located in a down hole control module (22). <IMAGE>

Description

SPECIFICATION Drilling apparatus Field of the invention This invention relates to drilling apparatus for drilling bore holes in the ground.
Summary ofthe invention According to the invention drilling apparatus com prises aflexible enclosure located in a space defined between two members, the enclosure serving either as an actuator to control the direction of drilling by applying a radial force between the members resulting in radial displacement between the members, or serving as a pump to deliverfluidto actuating means for controlling the direction of drilling, as a result of variation ofthe spacing betweenthe members.
When the flexible enclosure serves as an actuator, the enclosure is one of a plurality of such actuators disposed in said space which is annular. Preferably, the actuators apply a deflecting force which has a controlled magnitude and direction and which deflect a drilling tube ofthe drilling apparatus.
When the flexible enclosure serves as a pump, the spacing between the members conveniently varies as a result of rotation of an eccentric member. The eccentric member may rotate with a drilling tube and the flexible enclosure is located between a bearing sleeve and an outer casing, the bearing sleeve being non-rotatable and being mounted on the eccentric memberbya bearing.
In the preferred embodimentto be described, drilling apparatus has a plurality of actuators, each in the form of a flexible enclosure, and a pump also in the form of a flexible enclosure, the pump supplying fluid to selected actuators at a controlled pressure in dependence upon the required magnitude and direction ofthe deflecting force to be applied to the drilling tube.
Drilling apparatus according to the invention will now be described by way of example with reference to the accompanying drawings, in which: Figure lisa diagrammatic view of the bottom hole assembly of the drilling apparatus, Figure 2 is a detailed view of part of Figure 1, Figure 3 is a sectional view on the line lil-lil of Figure 2, Figure 4 is a detailed view of another part of Figure 1, and Figures 5,6 and 7 are respectively side, end and plan views of a flexible enclosure of the drilling apparatus.
Detailed description ofthe drawings Referring to Figure 1, the drilling apparatus comprises a rotatable drilling tube 10 carrying at its extremity a drilling bit 12. The drilling tube 10 is supported and centred in a bore hole 14 by two stabilisers 16, 18 and bya third, optional stabiliser 20.
Between the stabilisers 18 and 20 is a control module 22 which effects controlled deflection of the drilling tube 1 0to vary the drilling course or direction. In Figure 1, the undeflected drilling tube is indicated at 24, the deflected drilling tube at 26 and the variation in drilling angle at 28. The arrows 30 depict the reaction forces applied by the bore hole wall to the drilling tube 10, but the reaction to the deflecting force is resisted principally within the control module 22, as will be explained.
The module 22 has a cylindrical casing 32 having end seals 34 and enclosing bearings 36,38 and actuating means 40 for deflecting the drilling tube 10.
Referring to Figures 2 and 3,the actuating means 40 comprisefourflexibleenctosuresintheform of bags 42 located in the annular space between the casing 32 and a bearing sleeve 44. The bearing sleeve 44 does not rotate with the drilling tube 10 but is mounted on the latter by bearings 46. Fluid is fed to the bags 42 through hydraulic pipes 48 which communicate with a pump (50, Figure 4) through a valve block and reservoirs unit 52.
The pump 50 is located in the annular space between the casing 32 and a bearing sleeve 54 which is non-rotatably mounted on the rotatable drilling tube 10 by a bearing 56. Between the drilling tube 10 and the inner race ofthe bearing 56 is located an eccentric sleeve 58 which rotates with the drilling tube 10 and causesthe bearing sleeve 54to oscillate in the radial direction of arrow X in Figure 4, thereby to apply a pumping action to a flexible enclosure or bag 60 ofthe pump. The flexible bag 60 is similar in construction to one ofthe flexible bags 42. An anti-rotation pin 62 interconnecting the casing 32 and the bearing sleeve 54 prevents rotation of these two components.
Figures 5, and 7 showthe construction of a representative bag 42 orthe bag 60. The bag 42 or 60 has a fabric body formed into a tubular configuration, opposite edges being sealed by metallic clamping strips 64, from one of which extends a hydraulic supply or return pipe forming the hydraulic pipe 48.
The magnitude and direction ofthe deflecting force applied by the bags 42to the drilling tube are controlled by appropriate control of the application of hydraulic pressurefrom the pump by 60 tothe actuator bags 42. In order to achieve the required deflecting force, two adjacent bags 42 are individually pressurised to the required extent, and the two remaining bags 42 are completely depressurised, this being achieved by appropriate energisation of the valves in the valve block and reservoirs unit 52.
As mentioned, the deflecting force is applied to the drilling tube, in the desired magnitude and direction, to impart a curvature to the tube, as indicated at 26 in Figure 1. This controlled curvature controls the drilling direction. The reaction to the deflecting force is borne within the casing 32, the bearings 36,38 providing reactive forces on the tube. It will be notedthatthe bore hole wall provides no reactive forces to the tube 10through the intermediary ofthe casing 32.
1. Drilling apparatus comprising a fiexible enclo- sure located in a space defined between two members, the enclosure serving either as an actuatorto control the direction of drilling by applying a radial force between the members resulting in radial displacement between the members, or serving as a
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Drilling apparatus Field of the invention This invention relates to drilling apparatus for drilling bore holes in the ground. Summary ofthe invention According to the invention drilling apparatus com prises aflexible enclosure located in a space defined between two members, the enclosure serving either as an actuator to control the direction of drilling by applying a radial force between the members resulting in radial displacement between the members, or serving as a pump to deliverfluidto actuating means for controlling the direction of drilling, as a result of variation ofthe spacing betweenthe members. When the flexible enclosure serves as an actuator, the enclosure is one of a plurality of such actuators disposed in said space which is annular. Preferably, the actuators apply a deflecting force which has a controlled magnitude and direction and which deflect a drilling tube ofthe drilling apparatus. When the flexible enclosure serves as a pump, the spacing between the members conveniently varies as a result of rotation of an eccentric member. The eccentric member may rotate with a drilling tube and the flexible enclosure is located between a bearing sleeve and an outer casing, the bearing sleeve being non-rotatable and being mounted on the eccentric memberbya bearing. In the preferred embodimentto be described, drilling apparatus has a plurality of actuators, each in the form of a flexible enclosure, and a pump also in the form of a flexible enclosure, the pump supplying fluid to selected actuators at a controlled pressure in dependence upon the required magnitude and direction ofthe deflecting force to be applied to the drilling tube. Drilling apparatus according to the invention will now be described by way of example with reference to the accompanying drawings, in which: Figure lisa diagrammatic view of the bottom hole assembly of the drilling apparatus, Figure 2 is a detailed view of part of Figure 1, Figure 3 is a sectional view on the line lil-lil of Figure 2, Figure 4 is a detailed view of another part of Figure 1, and Figures 5,6 and 7 are respectively side, end and plan views of a flexible enclosure of the drilling apparatus. Detailed description ofthe drawings Referring to Figure 1, the drilling apparatus comprises a rotatable drilling tube 10 carrying at its extremity a drilling bit 12. The drilling tube 10 is supported and centred in a bore hole 14 by two stabilisers 16, 18 and bya third, optional stabiliser 20. Between the stabilisers 18 and 20 is a control module 22 which effects controlled deflection of the drilling tube 1 0to vary the drilling course or direction. In Figure 1, the undeflected drilling tube is indicated at 24, the deflected drilling tube at 26 and the variation in drilling angle at 28. The arrows 30 depict the reaction forces applied by the bore hole wall to the drilling tube 10, but the reaction to the deflecting force is resisted principally within the control module 22, as will be explained. The module 22 has a cylindrical casing 32 having end seals 34 and enclosing bearings 36,38 and actuating means 40 for deflecting the drilling tube 10. Referring to Figures 2 and 3,the actuating means 40 comprisefourflexibleenctosuresintheform of bags 42 located in the annular space between the casing 32 and a bearing sleeve 44. The bearing sleeve 44 does not rotate with the drilling tube 10 but is mounted on the latter by bearings 46. Fluid is fed to the bags 42 through hydraulic pipes 48 which communicate with a pump (50, Figure 4) through a valve block and reservoirs unit 52. The pump 50 is located in the annular space between the casing 32 and a bearing sleeve 54 which is non-rotatably mounted on the rotatable drilling tube 10 by a bearing 56. Between the drilling tube 10 and the inner race ofthe bearing 56 is located an eccentric sleeve 58 which rotates with the drilling tube 10 and causesthe bearing sleeve 54to oscillate in the radial direction of arrow X in Figure 4, thereby to apply a pumping action to a flexible enclosure or bag 60 ofthe pump. The flexible bag 60 is similar in construction to one ofthe flexible bags 42. An anti-rotation pin 62 interconnecting the casing 32 and the bearing sleeve 54 prevents rotation of these two components. Figures 5, and 7 showthe construction of a representative bag 42 orthe bag 60. The bag 42 or 60 has a fabric body formed into a tubular configuration, opposite edges being sealed by metallic clamping strips 64, from one of which extends a hydraulic supply or return pipe forming the hydraulic pipe 48. The magnitude and direction ofthe deflecting force applied by the bags 42to the drilling tube are controlled by appropriate control of the application of hydraulic pressurefrom the pump by 60 tothe actuator bags 42. In order to achieve the required deflecting force, two adjacent bags 42 are individually pressurised to the required extent, and the two remaining bags 42 are completely depressurised, this being achieved by appropriate energisation of the valves in the valve block and reservoirs unit 52. As mentioned, the deflecting force is applied to the drilling tube, in the desired magnitude and direction, to impart a curvature to the tube, as indicated at 26 in Figure 1. This controlled curvature controls the drilling direction. The reaction to the deflecting force is borne within the casing 32, the bearings 36,38 providing reactive forces on the tube. It will be notedthatthe bore hole wall provides no reactive forces to the tube 10through the intermediary ofthe casing 32. CLAIMS
1. Drilling apparatus comprising a fiexible enclo- sure located in a space defined between two members, the enclosure serving either as an actuatorto control the direction of drilling by applying a radial force between the members resulting in radial displacement between the members, or serving as a pump to deiiverfluidto actuating means forcontrolling the direction of drilling, as a result of variation of the spacing between the members.
2. Drilling apparatus accordingto claim 1, wherein the flexible enclosure serves as an actuator and is one of a plurality of such actuators disposed in said space which is annular.
3. Drilling apparatus according to claim 2, wherein the actuators apply a deflecting force which has a controlled magnitude and direction and which deflects a drilling tube ofthe drilling apparatus.
4. Drilling apparatus according to claim 3,wherein there are four actuators equi-angulariy positioned around the longitudinal axis ofthe drilling tube.
5. Drilling apparatus according to claim 3 or4, wherein said members are a casing and a bearing sleeve, the bearing sleeve being non-rotatable and being supported by means of bearings on the drilling tube.
6. Drilling apparatus according to claim 1, wherein the flexible enclosure serves as a pump and the spacing between the members varies as a result of rotation of an eccentric member.
7. Drilling apparatus according to claim 6, wherein the eccentric member rotates with a drilling tube and the flexible enclosure is located between a bearing sleeve and an outer casing, the bearing sleeve being non-rotatable and being mounted on the eccentric member buy a bearing.
8. Drilling apparatus according to claim 6 or7, wherein theflexibie enclosure serving as a pump feeds a plurality of actuators each constituted by a flexible enclosure as specified in any of claims 2 to 5.
GB08606518A 1985-03-16 1986-03-17 Drilling apparatus Expired GB2172324B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08606518A GB2172324B (en) 1985-03-16 1986-03-17 Drilling apparatus

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB858506866A GB8506866D0 (en) 1985-03-16 1985-03-16 Control of drilling courses
GB08517749A GB2177738B (en) 1985-07-13 1985-07-13 Control of drilling courses in the drilling of bore holes
GB08606518A GB2172324B (en) 1985-03-16 1986-03-17 Drilling apparatus

Publications (3)

Publication Number Publication Date
GB8606518D0 GB8606518D0 (en) 1986-04-23
GB2172324A true GB2172324A (en) 1986-09-17
GB2172324B GB2172324B (en) 1988-07-20

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GB08606518A Expired GB2172324B (en) 1985-03-16 1986-03-17 Drilling apparatus

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Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1001450A3 (en) * 1988-02-12 1989-10-31 Smet Marc Jozef Maria Tunnelling machine with jet nozzle - has remote-controlled units on head selectively varying body shape
WO1991019879A1 (en) * 1990-06-11 1991-12-26 Shirley Kirk R Drill steering apparatus
US6109372A (en) * 1999-03-15 2000-08-29 Schlumberger Technology Corporation Rotary steerable well drilling system utilizing hydraulic servo-loop
US6158529A (en) * 1998-12-11 2000-12-12 Schlumberger Technology Corporation Rotary steerable well drilling system utilizing sliding sleeve
WO2001004453A1 (en) 1999-07-12 2001-01-18 Halliburton Energy Services, Inc. Steerable rotary drilling device and directional drilling method
WO2001084023A1 (en) 2000-05-02 2001-11-08 Halliburton Energy Services, Inc. Seal assembly for limiting the movement of a seal within a seal housing
US6340063B1 (en) 1998-01-21 2002-01-22 Halliburton Energy Services, Inc. Steerable rotary directional drilling method
EP1264960A2 (en) 2001-06-05 2002-12-11 Services Petroliers Schlumberger Drilling tool with non rotating sleeve
WO2003002841A1 (en) 2001-06-28 2003-01-09 Halliburton Energy Services, Inc. Drilling direction control device
US6581699B1 (en) 1998-12-21 2003-06-24 Halliburton Energy Services, Inc. Steerable drilling system and method
US6598687B2 (en) * 1997-10-27 2003-07-29 Halliburton Energy Services, Inc. Three dimensional steerable system
US6712366B1 (en) 2000-05-02 2004-03-30 Halliburton Energy Services, Inc. Seal assembly for limiting the movement of a seal within a seal housing
US6948572B2 (en) 1999-07-12 2005-09-27 Halliburton Energy Services, Inc. Command method for a steerable rotary drilling device
EP1621722A1 (en) * 2004-07-26 2006-02-01 Walter Albrecht Steerable excavator
US7066284B2 (en) 2001-11-14 2006-06-27 Halliburton Energy Services, Inc. Method and apparatus for a monodiameter wellbore, monodiameter casing, monobore, and/or monowell
US7188689B2 (en) 2003-11-07 2007-03-13 Halliburton Energy Services, Inc. Variable gauge drilling apparatus and method of assembly therefor
US7222681B2 (en) 2005-02-18 2007-05-29 Pathfinder Energy Services, Inc. Programming method for controlling a downhole steering tool
US7245229B2 (en) 2003-07-01 2007-07-17 Pathfinder Energy Services, Inc. Drill string rotation encoding
US7306058B2 (en) 1998-01-21 2007-12-11 Halliburton Energy Services, Inc. Anti-rotation device for a steerable rotary drilling device
EP2180349A2 (en) 2008-10-22 2010-04-28 Gyrodata, Incorporated Downhole surveying utilizing multiple measurements
WO2011053364A1 (en) 2009-10-28 2011-05-05 Gyrodata Incorporated Downhole surveying utilizing multiple measurements
WO2011126760A2 (en) 2010-03-30 2011-10-13 Gyrodata, Incorporated Bending of a shaft of a steerable borehole drilling tool
US8065087B2 (en) 2009-01-30 2011-11-22 Gyrodata, Incorporated Reducing error contributions to gyroscopic measurements from a wellbore survey system
US8065085B2 (en) 2007-10-02 2011-11-22 Gyrodata, Incorporated System and method for measuring depth and velocity of instrumentation within a wellbore using a bendable tool
US8408331B2 (en) 2010-01-08 2013-04-02 Schlumberger Technology Corporation Downhole downlinking system employing a differential pressure transducer
US8570833B2 (en) 2010-05-24 2013-10-29 Schlumberger Technology Corporation Downlinking communication system and method
US8590636B2 (en) 2006-04-28 2013-11-26 Schlumberger Technology Corporation Rotary steerable drilling system
US8792304B2 (en) 2010-05-24 2014-07-29 Schlumberger Technology Corporation Downlinking communication system and method using signal transition detection
US9038750B2 (en) 2011-06-08 2015-05-26 Gas Technology Institute Rotary joint for subterranean drilling

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6092610A (en) * 1998-02-05 2000-07-25 Schlumberger Technology Corporation Actively controlled rotary steerable system and method for drilling wells
WO2001034935A1 (en) 1999-11-10 2001-05-17 Schlumberger Holdings Limited Control method for use with a steerable drilling system

Cited By (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1001450A3 (en) * 1988-02-12 1989-10-31 Smet Marc Jozef Maria Tunnelling machine with jet nozzle - has remote-controlled units on head selectively varying body shape
WO1991019879A1 (en) * 1990-06-11 1991-12-26 Shirley Kirk R Drill steering apparatus
US6843332B2 (en) 1997-10-27 2005-01-18 Halliburton Energy Services, Inc. Three dimensional steerable system and method for steering bit to drill borehole
US6607044B1 (en) 1997-10-27 2003-08-19 Halliburton Energy Services, Inc. Three dimensional steerable system and method for steering bit to drill borehole
US7195083B2 (en) 1997-10-27 2007-03-27 Halliburton Energy Services, Inc Three dimensional steering system and method for steering bit to drill borehole
US6598687B2 (en) * 1997-10-27 2003-07-29 Halliburton Energy Services, Inc. Three dimensional steerable system
US7306058B2 (en) 1998-01-21 2007-12-11 Halliburton Energy Services, Inc. Anti-rotation device for a steerable rotary drilling device
US6640909B2 (en) 1998-01-21 2003-11-04 Halliburton Energy Services, Inc. Steerable rotary drilling device
US6340063B1 (en) 1998-01-21 2002-01-22 Halliburton Energy Services, Inc. Steerable rotary directional drilling method
US6415878B1 (en) 1998-01-21 2002-07-09 Halliburton Energy Services, Inc. Steerable rotary drilling device
US6158529A (en) * 1998-12-11 2000-12-12 Schlumberger Technology Corporation Rotary steerable well drilling system utilizing sliding sleeve
US6581699B1 (en) 1998-12-21 2003-06-24 Halliburton Energy Services, Inc. Steerable drilling system and method
US7147066B2 (en) 1998-12-21 2006-12-12 Halliburton Energy Services, Inc. Steerable drilling system and method
US6109372A (en) * 1999-03-15 2000-08-29 Schlumberger Technology Corporation Rotary steerable well drilling system utilizing hydraulic servo-loop
EP1308598A2 (en) 1999-07-12 2003-05-07 Halliburton Energy Services, Inc. Pressure compensation system for a steerable rotary drilling device
US6244361B1 (en) 1999-07-12 2001-06-12 Halliburton Energy Services, Inc. Steerable rotary drilling device and directional drilling method
WO2001004453A1 (en) 1999-07-12 2001-01-18 Halliburton Energy Services, Inc. Steerable rotary drilling device and directional drilling method
EP1400654A2 (en) 1999-07-12 2004-03-24 Halliburton Energy Services, Inc. Command method for a steerable rotary drilling device
US6948572B2 (en) 1999-07-12 2005-09-27 Halliburton Energy Services, Inc. Command method for a steerable rotary drilling device
WO2001084023A1 (en) 2000-05-02 2001-11-08 Halliburton Energy Services, Inc. Seal assembly for limiting the movement of a seal within a seal housing
US7651100B2 (en) 2000-05-02 2010-01-26 Halliburton Energy Services, Inc. Seal assembly for limiting movement of a seal within a seal housing
US6712366B1 (en) 2000-05-02 2004-03-30 Halliburton Energy Services, Inc. Seal assembly for limiting the movement of a seal within a seal housing
EP1264960A2 (en) 2001-06-05 2002-12-11 Services Petroliers Schlumberger Drilling tool with non rotating sleeve
US6769499B2 (en) 2001-06-28 2004-08-03 Halliburton Energy Services, Inc. Drilling direction control device
WO2003002841A1 (en) 2001-06-28 2003-01-09 Halliburton Energy Services, Inc. Drilling direction control device
US7234544B2 (en) 2001-06-28 2007-06-26 Halliburton Energy Services, Inc. Drill tool shaft-to-housing locking device
US7225879B2 (en) 2001-11-14 2007-06-05 Halliburton Energy Services, Inc. Method and apparatus for a monodiameter wellbore, monodiameter casing, monobore, and/or monowell
US7066284B2 (en) 2001-11-14 2006-06-27 Halliburton Energy Services, Inc. Method and apparatus for a monodiameter wellbore, monodiameter casing, monobore, and/or monowell
US7245229B2 (en) 2003-07-01 2007-07-17 Pathfinder Energy Services, Inc. Drill string rotation encoding
US7188689B2 (en) 2003-11-07 2007-03-13 Halliburton Energy Services, Inc. Variable gauge drilling apparatus and method of assembly therefor
EP1621722A1 (en) * 2004-07-26 2006-02-01 Walter Albrecht Steerable excavator
US7222681B2 (en) 2005-02-18 2007-05-29 Pathfinder Energy Services, Inc. Programming method for controlling a downhole steering tool
US8590636B2 (en) 2006-04-28 2013-11-26 Schlumberger Technology Corporation Rotary steerable drilling system
US8065085B2 (en) 2007-10-02 2011-11-22 Gyrodata, Incorporated System and method for measuring depth and velocity of instrumentation within a wellbore using a bendable tool
US8655596B2 (en) 2007-10-02 2014-02-18 Gyrodata, Incorporated System and method for measuring depth and velocity of instrumentation within a wellbore using a bendable tool
US8433517B2 (en) 2007-10-02 2013-04-30 Gyrodata, Incorporated System and method for measuring depth and velocity of instrumentation within a wellbore using a bendable tool
US8781744B2 (en) 2008-10-22 2014-07-15 Gyrodata Incorporated Downhole surveying utilizing multiple measurements
US8433519B2 (en) 2008-10-22 2013-04-30 Gyrodata, Incorporated Downhole surveying utilizing multiple measurements
US8095317B2 (en) 2008-10-22 2012-01-10 Gyrodata, Incorporated Downhole surveying utilizing multiple measurements
US8185312B2 (en) 2008-10-22 2012-05-22 Gyrodata, Incorporated Downhole surveying utilizing multiple measurements
EP2180349A2 (en) 2008-10-22 2010-04-28 Gyrodata, Incorporated Downhole surveying utilizing multiple measurements
US8428879B2 (en) 2008-10-22 2013-04-23 Gyrodata, Incorporated Downhole drilling utilizing measurements from multiple sensors
US8374793B2 (en) 2009-01-30 2013-02-12 Gyrodata, Incorporated Reducing error contributions to gyroscopic measurements from a wellbore survey system
US8065087B2 (en) 2009-01-30 2011-11-22 Gyrodata, Incorporated Reducing error contributions to gyroscopic measurements from a wellbore survey system
WO2011053364A1 (en) 2009-10-28 2011-05-05 Gyrodata Incorporated Downhole surveying utilizing multiple measurements
US8408331B2 (en) 2010-01-08 2013-04-02 Schlumberger Technology Corporation Downhole downlinking system employing a differential pressure transducer
US8746366B2 (en) 2010-01-08 2014-06-10 Schlumberger Technology Corporation Downhole downlinking system employing a differential pressure transducer
WO2011126760A2 (en) 2010-03-30 2011-10-13 Gyrodata, Incorporated Bending of a shaft of a steerable borehole drilling tool
US8570833B2 (en) 2010-05-24 2013-10-29 Schlumberger Technology Corporation Downlinking communication system and method
US8792304B2 (en) 2010-05-24 2014-07-29 Schlumberger Technology Corporation Downlinking communication system and method using signal transition detection
US9726011B2 (en) 2010-05-24 2017-08-08 Schlumberger Technology Corporation Downlinking communication system and method
US9038750B2 (en) 2011-06-08 2015-05-26 Gas Technology Institute Rotary joint for subterranean drilling

Also Published As

Publication number Publication date
GB8606518D0 (en) 1986-04-23
GB2172324B (en) 1988-07-20

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Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
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Effective date: 20060316