CA1122965A - Apparatus and method for directional drilling - Google Patents
Apparatus and method for directional drillingInfo
- Publication number
- CA1122965A CA1122965A CA343,775A CA343775A CA1122965A CA 1122965 A CA1122965 A CA 1122965A CA 343775 A CA343775 A CA 343775A CA 1122965 A CA1122965 A CA 1122965A
- Authority
- CA
- Canada
- Prior art keywords
- borehole
- housing
- deflection device
- main body
- body member
- 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.)
- Expired
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title abstract description 11
- 239000012530 fluid Substances 0.000 claims description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 14
- 239000011707 mineral Substances 0.000 abstract description 14
- 239000003245 coal Substances 0.000 description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000005065 mining Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000007872 degassing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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)
Abstract
Case No. 6116 APPARATUS AND METHOD FOR DIRECTIONAL DRILLING
Abstract of the Disclosure A method and apparatus for drilling a horizon-tal borehole through a subterranean mineral bed with a drilling assembly including a drill shaft connected to a down-hole motor and drill bit. A deflection device is positioned between the down-hole motor and the drill bit. The deflection device applies a predetermined per-pendicular force to the drill bit causing the borehole to deviate from the drill shaft axis in the direction of the force. The method includes periodically survey-ing the borehole to determine its position relative to the top or bottom of the mineral bed, and rotating the drill shaft through a half turn sequentially to provide an alternating upward and downward trajectory to the borehole within the upper and lower boundaries of the mineral bed.
Abstract of the Disclosure A method and apparatus for drilling a horizon-tal borehole through a subterranean mineral bed with a drilling assembly including a drill shaft connected to a down-hole motor and drill bit. A deflection device is positioned between the down-hole motor and the drill bit. The deflection device applies a predetermined per-pendicular force to the drill bit causing the borehole to deviate from the drill shaft axis in the direction of the force. The method includes periodically survey-ing the borehole to determine its position relative to the top or bottom of the mineral bed, and rotating the drill shaft through a half turn sequentially to provide an alternating upward and downward trajectory to the borehole within the upper and lower boundaries of the mineral bed.
Description
~lZ~9~5 ~. _ Background of the Invention This invention relates to a method and apparatus for drilling generally horizontal boreholes in a subterranean earth formation, and more particularly to a method and apparatus for adjusting the trajectory of such a borehole to maintain same within the upper and lower boundaries of a mineral bed such as a seam of coal.
The drilling of long generally horizontal gas drainage holes in coal beds is known in the art as a method for degasifying a coal bed in advance of mining. The gas drainage holes drilled in this manner are either vented or connected to a vacuum source to remove methane from a coal bed. The greatest pr'oblem encountered in drilling these gas relief holes is that of maintaining the bit trajectory within the coal seam such that the resulting holes are actually through the coal seam rather than through an overlying or underlying formation. Control of borehole trajectory is also important in exploratory drilling for coal or other minerals.
Description of the Prior Art . .
A directional drilling system including a drill shaft, a down-hole fluid motor connected to a rotatable bit, and a deflection means is described in ~.S. Patent No. 3,260,318.
The deflection means described therein is a shaft housing having a slight angle formed therein to divert the drill bit from the axis of the drill shaft. Rotation of the drill shaft and housing through part of a turn changes the direction of the borehole relative to the drill shaft.
Summary of the 'Invention According to one aspect of the invention, a deflection device for a drilling apparatus is provided. The deflection device applies a predetermined radial force to a drill bit, causing the trajectory of the borehole being drilled to be deflected in the direction of the applied force.
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The drilling of long generally horizontal gas drainage holes in coal beds is known in the art as a method for degasifying a coal bed in advance of mining. The gas drainage holes drilled in this manner are either vented or connected to a vacuum source to remove methane from a coal bed. The greatest pr'oblem encountered in drilling these gas relief holes is that of maintaining the bit trajectory within the coal seam such that the resulting holes are actually through the coal seam rather than through an overlying or underlying formation. Control of borehole trajectory is also important in exploratory drilling for coal or other minerals.
Description of the Prior Art . .
A directional drilling system including a drill shaft, a down-hole fluid motor connected to a rotatable bit, and a deflection means is described in ~.S. Patent No. 3,260,318.
The deflection means described therein is a shaft housing having a slight angle formed therein to divert the drill bit from the axis of the drill shaft. Rotation of the drill shaft and housing through part of a turn changes the direction of the borehole relative to the drill shaft.
Summary of the 'Invention According to one aspect of the invention, a deflection device for a drilling apparatus is provided. The deflection device applies a predetermined radial force to a drill bit, causing the trajectory of the borehole being drilled to be deflected in the direction of the applied force.
1;,. J~
llZ2~i5
- 2 -~
Accordingly this aspect of the invention consists of a drilling apparatus comprised of a drill shaft extending to a down-hole motor at the end of said drill shaft, a drill blt rotatably connected to said motor by a rotatable shaft, and a non-rotating housing extending from said motor over said shaft and the improvement wherein a deflection means is attached to said housing, said deflection means extending radially beyond said housing at one side thereof.
In particular, the invention provides a deflection device for use with a directional drilling system including a drill shaft, a downhole fluid motor connected through a rotatable shaft to a drill bit, and a housing having top, bottom and side surfaces over the rotatable shaft, said deflection device comprising:
(a) a main body member adapted for sliding movement over the side surfaces of said housing, said main body member including a borehole wall-contacting surface at the top thereof and having spring-containing recess means formed therein;
(b) a bottom body member attached to said main body member and adapted to abut the bottom surface of said housing when said main body member is in its uppermost position relative to said housing;
and (c) spring means in said recess means, said spring means adapted to constantly urge said wall-contacting surface away from said housing with a force sufficient to deflect the trajectory of a borehole being drilled and being the sole means for moving said deflection device relative to said housing.
The method of using the deflection device includes period-ically surveying the borehole being drilled, and adjusting the orientation of the deflection device to maintain the borehole within the boundaries of the mineral bed through which the borehole is being drilled.
Accordingly this aspect of the invention consists of a method of drilling a horizontal borehole through a subterranean mineral bed with a drilling apparatus having a drill shaft connected to a down-hole motor which provides rotation to a drill bit and the improvement wherein:
(a) a deflection device having an outwardly biased wall contacting surface is provided on said drilling apparatus between said motor and drill bit and oriented relative to said borehole;
(b) said borehole is extended for a distance into said ~r~
1~2;~ ;S
2a -mineral bed while maintaining the orientation of said deflection device;
(c) information regarding the trajectory of said borehole is obtained; and (d) said deflection devlce is rotated through part of a turn whereby upon resumption of drilling the trajectory of said borehole is modified.
Brief Desc iption of the Drawings Figure l is an illustration of a drilling apparatus showing the relation of the deflection device of the invention to a drilling assembly.
Figure 2 is an exploded view showing the structural details of the preferred embodiment of the deflection device.
Figure 3 is a cross section showing the re]ation of the deflection device to the drilling apparatus.
Figure 4 is a cross section of the deflection device and drilling apparatus taken along the line 4-4 of Figure 3.
Description of the Preferred Embodiment _ _ The relationship of the deflection device of this invention to a drilling assembly is shown generally in Figure 1.
Figure 1 shows a drill shaft 10 connected to an orienting sub 11 and a down-hole motor 12. Motor 12 is preferably a Moyno type fluid motor having a rotatable shaft (not shown) extending through shaft housing 14 and connected to drill bit 13. Shaft housing 14 e~tends between motor 12 and bit 13. A deflection device 15 is mounted over a section of shaft housing 14, and extends radially beyond shaft housing 14 at one side. The portion of the deflection device extending beyond the shaft housing includes . . . . . . . . .
112;~ 5 wall contacting surface 26 which contact~ the wall of borehole 16 being drilled through a mineral bed.
The drilling assembly including the drill ~haft orienting sub, motor, ~haft housing and drill bit is preferably of the type generally described in U. S. Patent No. 3,260,318. This type of drilling apparatus, without the deflection de~ice of this invention, has been widely used in the drilling in-dustry .
The details of the preferred version of ths deflection device of this invention are shown in Figures 2, 3 and 4.
Shaft housing 14 is machined to provide a reduced section including a top surface 17, sides 18 and 19, and bottom surface 20. Shaft housing 14 includes an internal bore 29 through which a rotatable shaft (not shown) connecting the fluid motor and the rotating drill bit extends. The main body 21 of deflection device 15 is formed to fit closely over sides 18 and 19 of the reduced section of shaft hou3ing 14 and to be slidable with respect thereto.
Reces~es 22 and 23 in main body member 21 are provided for containing springs 24 and 25 which urge borehole wall-contacting surface 26 of deflection device 15 radially outward from shaft housing 14~ Bottom body member 27 attaches to main body member 21 with fasteners 28 to encompass the reduced section of shaft housing 14 and to compress ~prings 24 and 25.
The defleation force provided by the springs depends to some extent on the particular drilling apparatus and the rate of direction chan~e desired. When the borehole has a diameter of from 75 to 150 mm (prefer-ably 75 to 100 mm) a deflection force of at least 225 newtons is preferred. In order to provide the preferred rate of angle build of about 0.5/3 m in a coal seam, a deflection force of 450 to 900 newtons 1~2;~ i5 i8 generally adequate.
Figures 3 and 4 show the assembled deflection device. When it is assembled and unrestrained, the springs 24 and 25 act to position the deflection device ~o that bottom member 27 abutts the bottom surface 20 of housing 14, and wall contacting surface 26 extends outwardly beyond the shaft housing 14.
The apparatus described above is particu-larly suited for drilling generally horizontal de-l~ gasification holes in underground coal seams to re-duce the methane concentration in a mine working area in advance of mining the seam. To be effective, the degaæification holes must be kept within the boun-dari~s of the coal seam. The deflection device, properly used, enables an operator to maintain the borehole between the upper and lower boundaries of the coal seam.
The method of drilling a borehole in a mineral bed using the deflection device of this in-vention will now be described. The drilling apparatusis ~et up, and after drilling an initial surface hole a 9hort distance into the seam, the apparatus as shown in Figure 1 is inserted in the borehole and oriented with the wall-contacting sur~ace 26 of the deflection devlce oriented against either the top or the bottom of the borehole. In order to guide the drill bit succes-fully and contain it in the mineral bed, it is essen-tial to know the position of the bit in relation to - the roof and the floor of the mineral bed and the pitch 3a and roll of the borehole. Borehole survey instruments which provide the required information are available.
These instruments may be pumped down the drill shaft to a position near the motor where they are positioned by an or~enting sub, and information as to the posi-tion of the borehole may be obtained. The surYey probei8 then removed, and if a change in direction of the ~11 2~5 borehole is indicated, the drill shaft is rotated through a part of a turn, thereby also rotating the de~lection device the same amount, and drilling is re-sumed. Normally, the deflection device i8 oriented to provide either an upward or downward force to the drill bit, although in some cases a side force may be indicated. If the borehole is moving upward, and the surveying probe indicates that the borehole is near the top surface of the mineral bed, the drill shaft and deflection device are rotated 180 to provide a downward force to the drill bit. Drilling is resumed until the surveying probe indicates that the borehole is approaching the hottom layer of the mineral bed, at which time the drill shaft and deflection device are again rotated 180. ~his procedure i8 repeated until the borehole extends the desired distance into the minera~ bed.
The deflection device in accordance with the invention has proven to be effective in drilling de-gasification holes in coal seams in advance of mining.
Several degasification holes have been drilled through coal beds for distances greater than 300 meters, there-by providing significant reductions in methane concen-trations at the time of actual mining of the coal bed.
It will be apparent to those skilled in the art that variations and modifications of the structural details of the deflection device described herein could be made without departing from the true scope of the invention as defined in the appended claims.
Accordingly this aspect of the invention consists of a drilling apparatus comprised of a drill shaft extending to a down-hole motor at the end of said drill shaft, a drill blt rotatably connected to said motor by a rotatable shaft, and a non-rotating housing extending from said motor over said shaft and the improvement wherein a deflection means is attached to said housing, said deflection means extending radially beyond said housing at one side thereof.
In particular, the invention provides a deflection device for use with a directional drilling system including a drill shaft, a downhole fluid motor connected through a rotatable shaft to a drill bit, and a housing having top, bottom and side surfaces over the rotatable shaft, said deflection device comprising:
(a) a main body member adapted for sliding movement over the side surfaces of said housing, said main body member including a borehole wall-contacting surface at the top thereof and having spring-containing recess means formed therein;
(b) a bottom body member attached to said main body member and adapted to abut the bottom surface of said housing when said main body member is in its uppermost position relative to said housing;
and (c) spring means in said recess means, said spring means adapted to constantly urge said wall-contacting surface away from said housing with a force sufficient to deflect the trajectory of a borehole being drilled and being the sole means for moving said deflection device relative to said housing.
The method of using the deflection device includes period-ically surveying the borehole being drilled, and adjusting the orientation of the deflection device to maintain the borehole within the boundaries of the mineral bed through which the borehole is being drilled.
Accordingly this aspect of the invention consists of a method of drilling a horizontal borehole through a subterranean mineral bed with a drilling apparatus having a drill shaft connected to a down-hole motor which provides rotation to a drill bit and the improvement wherein:
(a) a deflection device having an outwardly biased wall contacting surface is provided on said drilling apparatus between said motor and drill bit and oriented relative to said borehole;
(b) said borehole is extended for a distance into said ~r~
1~2;~ ;S
2a -mineral bed while maintaining the orientation of said deflection device;
(c) information regarding the trajectory of said borehole is obtained; and (d) said deflection devlce is rotated through part of a turn whereby upon resumption of drilling the trajectory of said borehole is modified.
Brief Desc iption of the Drawings Figure l is an illustration of a drilling apparatus showing the relation of the deflection device of the invention to a drilling assembly.
Figure 2 is an exploded view showing the structural details of the preferred embodiment of the deflection device.
Figure 3 is a cross section showing the re]ation of the deflection device to the drilling apparatus.
Figure 4 is a cross section of the deflection device and drilling apparatus taken along the line 4-4 of Figure 3.
Description of the Preferred Embodiment _ _ The relationship of the deflection device of this invention to a drilling assembly is shown generally in Figure 1.
Figure 1 shows a drill shaft 10 connected to an orienting sub 11 and a down-hole motor 12. Motor 12 is preferably a Moyno type fluid motor having a rotatable shaft (not shown) extending through shaft housing 14 and connected to drill bit 13. Shaft housing 14 e~tends between motor 12 and bit 13. A deflection device 15 is mounted over a section of shaft housing 14, and extends radially beyond shaft housing 14 at one side. The portion of the deflection device extending beyond the shaft housing includes . . . . . . . . .
112;~ 5 wall contacting surface 26 which contact~ the wall of borehole 16 being drilled through a mineral bed.
The drilling assembly including the drill ~haft orienting sub, motor, ~haft housing and drill bit is preferably of the type generally described in U. S. Patent No. 3,260,318. This type of drilling apparatus, without the deflection de~ice of this invention, has been widely used in the drilling in-dustry .
The details of the preferred version of ths deflection device of this invention are shown in Figures 2, 3 and 4.
Shaft housing 14 is machined to provide a reduced section including a top surface 17, sides 18 and 19, and bottom surface 20. Shaft housing 14 includes an internal bore 29 through which a rotatable shaft (not shown) connecting the fluid motor and the rotating drill bit extends. The main body 21 of deflection device 15 is formed to fit closely over sides 18 and 19 of the reduced section of shaft hou3ing 14 and to be slidable with respect thereto.
Reces~es 22 and 23 in main body member 21 are provided for containing springs 24 and 25 which urge borehole wall-contacting surface 26 of deflection device 15 radially outward from shaft housing 14~ Bottom body member 27 attaches to main body member 21 with fasteners 28 to encompass the reduced section of shaft housing 14 and to compress ~prings 24 and 25.
The defleation force provided by the springs depends to some extent on the particular drilling apparatus and the rate of direction chan~e desired. When the borehole has a diameter of from 75 to 150 mm (prefer-ably 75 to 100 mm) a deflection force of at least 225 newtons is preferred. In order to provide the preferred rate of angle build of about 0.5/3 m in a coal seam, a deflection force of 450 to 900 newtons 1~2;~ i5 i8 generally adequate.
Figures 3 and 4 show the assembled deflection device. When it is assembled and unrestrained, the springs 24 and 25 act to position the deflection device ~o that bottom member 27 abutts the bottom surface 20 of housing 14, and wall contacting surface 26 extends outwardly beyond the shaft housing 14.
The apparatus described above is particu-larly suited for drilling generally horizontal de-l~ gasification holes in underground coal seams to re-duce the methane concentration in a mine working area in advance of mining the seam. To be effective, the degaæification holes must be kept within the boun-dari~s of the coal seam. The deflection device, properly used, enables an operator to maintain the borehole between the upper and lower boundaries of the coal seam.
The method of drilling a borehole in a mineral bed using the deflection device of this in-vention will now be described. The drilling apparatusis ~et up, and after drilling an initial surface hole a 9hort distance into the seam, the apparatus as shown in Figure 1 is inserted in the borehole and oriented with the wall-contacting sur~ace 26 of the deflection devlce oriented against either the top or the bottom of the borehole. In order to guide the drill bit succes-fully and contain it in the mineral bed, it is essen-tial to know the position of the bit in relation to - the roof and the floor of the mineral bed and the pitch 3a and roll of the borehole. Borehole survey instruments which provide the required information are available.
These instruments may be pumped down the drill shaft to a position near the motor where they are positioned by an or~enting sub, and information as to the posi-tion of the borehole may be obtained. The surYey probei8 then removed, and if a change in direction of the ~11 2~5 borehole is indicated, the drill shaft is rotated through a part of a turn, thereby also rotating the de~lection device the same amount, and drilling is re-sumed. Normally, the deflection device i8 oriented to provide either an upward or downward force to the drill bit, although in some cases a side force may be indicated. If the borehole is moving upward, and the surveying probe indicates that the borehole is near the top surface of the mineral bed, the drill shaft and deflection device are rotated 180 to provide a downward force to the drill bit. Drilling is resumed until the surveying probe indicates that the borehole is approaching the hottom layer of the mineral bed, at which time the drill shaft and deflection device are again rotated 180. ~his procedure i8 repeated until the borehole extends the desired distance into the minera~ bed.
The deflection device in accordance with the invention has proven to be effective in drilling de-gasification holes in coal seams in advance of mining.
Several degasification holes have been drilled through coal beds for distances greater than 300 meters, there-by providing significant reductions in methane concen-trations at the time of actual mining of the coal bed.
It will be apparent to those skilled in the art that variations and modifications of the structural details of the deflection device described herein could be made without departing from the true scope of the invention as defined in the appended claims.
Claims (4)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A deflection device for use with a directional drilling system including a drill shaft, a downhole fluid motor connected through a rotatable shaft to a drill bit, and a housing having top, bottom and side surfaces over the rotatable shaft, said deflection device comprising:
(a) a main body member adapted for sliding movement over the side surfaces of said housing, said main body member including a borehole wall-contacting surface at the top thereof and having spring-containing recess means formed therein;
(b) a bottom body member attached to said main body member and adapted to abut the bottom surface of said housing when said main body member is in its uppermost position relative to said housing; and (c) spring means in said recess means, said spring means adapted to constantly urge said wall-contacting surface away from said housing with a force sufficient to deflect the trajectory of a borehole being drilled and being the sole means for moving said deflection device relative to said housing.
(a) a main body member adapted for sliding movement over the side surfaces of said housing, said main body member including a borehole wall-contacting surface at the top thereof and having spring-containing recess means formed therein;
(b) a bottom body member attached to said main body member and adapted to abut the bottom surface of said housing when said main body member is in its uppermost position relative to said housing; and (c) spring means in said recess means, said spring means adapted to constantly urge said wall-contacting surface away from said housing with a force sufficient to deflect the trajectory of a borehole being drilled and being the sole means for moving said deflection device relative to said housing.
2. The device of Claim 1 wherein said main body housing includes two spring containing recesses each having a coil spring therein.
3. The device of Claim 1 wherein said spring means provides a deflection force of at least 225 newtons.
4. The device of Claim 1 wherein said spring means provides a deflection force of from 450 to 900 newtons.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US1358479A | 1979-02-21 | 1979-02-21 | |
| US13,584 | 1979-02-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1122965A true CA1122965A (en) | 1982-05-04 |
Family
ID=21760692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA343,775A Expired CA1122965A (en) | 1979-02-21 | 1980-01-16 | Apparatus and method for directional drilling |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0015137B1 (en) |
| AU (1) | AU536113B2 (en) |
| CA (1) | CA1122965A (en) |
| DE (1) | DE3066665D1 (en) |
| PL (1) | PL124814B1 (en) |
| ZA (1) | ZA797051B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5101912A (en) * | 1990-01-15 | 1992-04-07 | Marc Smet | Steerable ground drilling devices |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4471843A (en) * | 1982-04-23 | 1984-09-18 | Conoco Inc. | Method and apparatus for rotary drill guidance |
| GB9521972D0 (en) * | 1995-10-26 | 1996-01-03 | Camco Drilling Group Ltd | A drilling assembly for drilling holes in subsurface formations |
| NO308552B1 (en) * | 1998-12-09 | 2000-09-25 | Devico As | Device for non-conforming drills |
| WO2004113666A1 (en) * | 2003-06-17 | 2004-12-29 | Noble Drilling Services Inc. | Split housing for rotary steerable tool |
| US7267184B2 (en) | 2003-06-17 | 2007-09-11 | Noble Drilling Services Inc. | Modular housing for a rotary steerable tool |
| US10316638B1 (en) | 2004-10-28 | 2019-06-11 | Danny T. Williams | Formation dip geo-steering method |
| US8875806B2 (en) | 2004-10-28 | 2014-11-04 | Danny T. Williams | Formation dip geo-steering method |
| US8960326B2 (en) | 2004-10-28 | 2015-02-24 | Danny T. Williams | Formation dip geo-steering method |
| US7191850B2 (en) * | 2004-10-28 | 2007-03-20 | Williams Danny T | Formation dip geo-steering method |
| US10544666B1 (en) | 2004-10-28 | 2020-01-28 | Danny T. Williams | Formation dip geo-steering method |
| US11261667B2 (en) | 2015-03-24 | 2022-03-01 | Baker Hughes, A Ge Company, Llc | Self-adjusting directional drilling apparatus and methods for drilling directional wells |
| US11193331B2 (en) | 2019-06-12 | 2021-12-07 | Baker Hughes Oilfield Operations Llc | Self initiating bend motor for coil tubing drilling |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2316409A (en) * | 1941-12-05 | 1943-04-13 | Lloyd R Downing | Oil well straightener |
| US3062303A (en) * | 1960-03-21 | 1962-11-06 | Shell Oil Co | Method and apparatus for controlling hole direction and inclination |
| US3098534A (en) * | 1960-06-14 | 1963-07-23 | Carr Warren Farrell | Directional drill with hydraulically extended shoe |
| US3298449A (en) * | 1963-10-24 | 1967-01-17 | Drilco Oil Tools Inc | Well bore apparatus |
| US3561549A (en) * | 1968-06-07 | 1971-02-09 | Smith Ind International Inc | Slant drilling tools for oil wells |
| US3593810A (en) * | 1969-10-13 | 1971-07-20 | Schlumberger Technology Corp | Methods and apparatus for directional drilling |
| US3888319A (en) * | 1973-11-26 | 1975-06-10 | Continental Oil Co | Control system for a drilling apparatus |
| JPS5265148A (en) * | 1975-11-25 | 1977-05-30 | Kogyo Gijutsuin | Curve boring device |
| US4040495A (en) * | 1975-12-22 | 1977-08-09 | Smith International, Inc. | Drilling apparatus |
-
1979
- 1979-12-24 AU AU54184/79A patent/AU536113B2/en not_active Ceased
- 1979-12-28 ZA ZA00797051A patent/ZA797051B/en unknown
-
1980
- 1980-01-16 CA CA343,775A patent/CA1122965A/en not_active Expired
- 1980-02-19 DE DE8080300476T patent/DE3066665D1/en not_active Expired
- 1980-02-19 EP EP80300476A patent/EP0015137B1/en not_active Expired
- 1980-02-21 PL PL1980222161A patent/PL124814B1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5101912A (en) * | 1990-01-15 | 1992-04-07 | Marc Smet | Steerable ground drilling devices |
Also Published As
| Publication number | Publication date |
|---|---|
| PL222161A1 (en) | 1980-11-03 |
| ZA797051B (en) | 1980-12-31 |
| DE3066665D1 (en) | 1984-03-29 |
| EP0015137A1 (en) | 1980-09-03 |
| PL124814B1 (en) | 1983-02-28 |
| AU536113B2 (en) | 1984-04-19 |
| EP0015137B1 (en) | 1984-02-22 |
| AU5418479A (en) | 1980-08-28 |
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