CN113250639A - High-torsion-resistance back-off fishing pipe column and fishing method and application thereof - Google Patents
High-torsion-resistance back-off fishing pipe column and fishing method and application thereof Download PDFInfo
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- CN113250639A CN113250639A CN202010885224.0A CN202010885224A CN113250639A CN 113250639 A CN113250639 A CN 113250639A CN 202010885224 A CN202010885224 A CN 202010885224A CN 113250639 A CN113250639 A CN 113250639A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 241000251468 Actinopterygii Species 0.000 claims abstract description 25
- 238000005553 drilling Methods 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 36
- 230000007935 neutral effect Effects 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- 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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/20—Grappling tools, e.g. tongs or grabs gripping internally, e.g. fishing spears
-
- 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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Marine Sciences & Fisheries (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a high-torsion-resistance back-off fishing pipe column and a fishing method and application thereof.A reverse-thread male cone is used for firmly grabbing underground fish; the high-torsion-resistance drill collar is used for realizing independent transmission of torque and axial force and avoiding the reverse opening of the buckle during the reverse buckling operation; the conversion joint is used for realizing conversion from a high torsion resistance type to a drilling tool buckling type; the reverse-thread male cone, the high-torsion-resistance drill collar and the adapter are sequentially and axially connected in a threaded manner from bottom to top. The fishing device adopts a high anti-torsion structure design from a reverse thread male cone, a special drill collar and an adapter, so that the separation of a torque and axial force transmission mechanism in a fishing pipe column is realized; the axial force is still transmitted by the screw thread, and the torque is transmitted by the spline; therefore, the problem that the screw thread is easy to open during back-off operation due to small size is solved; the fishing success rate is improved, and the operation cost is reduced.
Description
Technical Field
The invention relates to the technical field of workover operations of oil fields, oil gases and water wells, in particular to a high-torsion-resistance back-off fishing pipe column and a fishing method and application thereof.
Background
With the continuous promotion of the oil and gas development process of the Bohai sea oil field, the well repair workload of shut-in wells and low-yield and low-efficiency wells is increased year by year, and particularly, the situations that a central pipe column needs to be fished when stuck due to scaling and sand production are more and more. At present, a fishing central pipe in a small-size sand control pipe column in the market is usually carried out by matching a common phi 79mm drill collar with a fishing tool (a male cone, a retractable fishing spear and the like).
The salvaged drilling tool combinations are mainly classified into 2 types: 1. the phi 79mm positive-buckling drill collar and positive-buckling fishing tool has the advantages that the maximum buckling torque of the drill collar is only 4KN.m, so that the back-off torque is small, the drilling tool mainly depends on shock fishing, and the success rate is low. 2. A reversed-buckling drill collar and a reversed-buckling fishing tool with the diameter of 79mm can perform reversed-buckling fishing within the maximum torsion resistance range of the drill collar, and if the reversed-buckling is unsuccessful and the hand needs to be released, the drilling tool and the tool are prone to well dropping accidents caused by the failure of the released hand. The axial force and the torque of the conventional fishing pipe column are transmitted through the thread and the screw thread, and when reverse torque of the reverse thread is transmitted, the risk of opening the thread by the screw thread is very high, so that the fishing pipe column is inverted, and the fishing failure is caused. At present, in a Bohai sea oil field, the accidents of falling of a drill collar with the diameter of 79mm and a fishing tool are up to 10 times each year because the tool cannot be taken off the hand. There is currently no effective solution to this problem.
Disclosure of Invention
The invention overcomes the defects of the prior art, the existing salvage drilling tool combination has the advantages of small bearable back-off torque, salvage by means of jarring, low success rate, and low success rate of hand release when the back-off is unsuccessful and the hand release is needed, and the situation that the drilling tool and the tool fall into the well due to the failure of the hand release often occurs. The invention provides a high-torsion-resistance back-off fishing pipe column and a fishing method and application thereof, the back-off fishing efficiency is greatly improved, and the development cost is reduced.
The purpose of the invention is realized by the following technical scheme.
A high-torsion-resistance back-off fishing pipe column, which comprises a reverse thread male cone, a high-torsion-resistance drill collar and a conversion joint,
the reverse-thread male cone is used for firmly grabbing the fish falling in the well;
the high torsion-resistant drill collar is used for realizing independent transmission of torque and axial force and avoiding the reverse opening of the buckle during the reverse buckling operation;
the conversion joint is used for realizing conversion from a high torsion resistance type to a drilling tool buckling type;
the reverse-thread male cone, the high-torsion-resistance drill collar and the adapter are sequentially axially connected in a threaded manner from bottom to top;
the upper part of the high anti-torsion drill collar is connected with the lower part of the adapter and the upper part of the reverse-thread male cone is connected with the lower part of the high anti-torsion drill collar through splines and spline grooves, so that the high anti-torsion drill collar and the adapter as well as the reverse-thread male cone and the high anti-torsion drill collar are prevented from rotating relatively and can bear large torque, and meanwhile, the threads on the connecting sleeve can not bear external torque; connecting sleeves are arranged on the outer sides of the upper portion of the high anti-torsion drill collar and the lower portion of the adapter, threads are respectively arranged at the upper end and the lower end of each connecting sleeve, the outer wall of the upper portion of the high anti-torsion drill collar is connected with the inner wall of the lower portion of each connecting sleeve through the threads, the outer wall of the lower portion of the adapter is connected with the inner wall of the upper portion of each connecting sleeve through the threads, and the high anti-torsion drill collar, the adapter and the connecting sleeves are in threaded connection and can bear the tensile force.
And installing a drilling tool on the adapter.
The high anti-torsion drill collar is characterized in that a first sealing ring is arranged on a contact surface of the high anti-torsion drill collar and the adapter, a second sealing ring is arranged on a contact surface of the connecting sleeve and the adapter, a third sealing ring is arranged on a contact surface of the connecting sleeve and the high anti-torsion drill collar, the first sealing ring, the second sealing ring and the third sealing ring are used for guaranteeing the sealing performance among the high anti-torsion drill collar, the adapter and the connecting sleeve, through holes are uniformly formed in the outer wall of the lower portion of the connecting sleeve along the circumferential direction, and plugs are arranged on the through holes.
The outer surface of the lower part of the adapter is provided with three sections of steps, the upper step is uniformly provided with external threads and a second sealing ring groove along the circumferential direction, the middle step is uniformly provided with splines along the circumferential direction, and the lower step is uniformly provided with a first sealing ring groove along the circumferential direction; the inner surface of the upper portion of the high anti-torsion drill collar is provided with two sections of steps, spline grooves are uniformly formed in the steps of the upper portion in the circumferential direction, splines on the adapter correspond to the spline grooves on the high anti-torsion drill collar one to one, the size of one group of splines and the spline grooves is larger than that of the other groups of splines and the spline grooves, and third sealing ring grooves and external threads are uniformly formed in the steps of the lower portion in the circumferential direction.
The fishing string is 2-3.5 inches in size, i.e., 2 "-3-1/2".
The tensile strength of the fishing string is 500-700 KN; the maximum torsion resistance of the fishing pipe column is 10-15 KN.m.
A salvaging method of a salvaging pipe column with high torsion resistance is carried out according to the following steps:
step 1, feeding the fishing pipe column into the underground, and firmly grabbing the underground fish in a mode of reversing and making a button by using a reverse thread male cone;
step 3, back-off operation: if the fishing pipe column cannot be unlocked by up-and-down movement and jarring, the fishing pipe column is lifted to a preset hanging weight, the neutral point of the fishing pipe column is located at the expected opening depth of the underground fish, the fishing pipe column is rotated anticlockwise on the ground, the torque is transmitted to the underground fish, when the torque applied by the fishing pipe column exceeds the screw tightening torque of the fish, the underground fish is opened, the fishing pipe column is lifted after continuous reversal, the fish above a tripping part can be recovered out of the well, and the back-off fishing operation is completed.
In step 2, the tensile strength of the fishing string is 500-700 KN.
In step 3, the maximum twist resistance of the fishing string is 10-15 KN.m.
The invention has the beneficial effects that: the fishing device adopts a high anti-torsion structure design from a reverse thread male cone, a special drill collar and an adapter, so that the separation of a torque and axial force transmission mechanism in a fishing pipe column is realized; the axial force is still transmitted by the screw thread, and the torque is transmitted by the spline; therefore, the defect that the screw thread is easy to open during back-off operation due to small size is avoided; the fishing success rate is improved, and the operation cost is reduced.
Drawings
FIG. 1 is a schematic structural view of a high torque-resistant back-off fishing string of the present invention;
FIG. 2 is an enlarged partial schematic view of FIG. 1;
fig. 3 is a schematic cross-sectional view a-a of fig. 2.
In the figure: 1 is a reverse thread male cone; 2 is a high torsion-resistant drill collar; 3 is a crossover sub; 4, a drilling tool; 5 is a connecting sleeve; 6 is a first sealing ring; 7 is a second sealing ring; 8 is a third sealing ring; 9 is a plug
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples.
Example one
A high-torsion-resistance back-off fishing pipe column comprises a reverse-thread male cone 1, a high-torsion-resistance drill collar 2 and an adapter 3,
the reverse-thread male cone 1 is used for firmly grabbing the fish falling in the well;
the high anti-torsion drill collar 2 is used for realizing independent transmission of torque and axial force and avoiding the back-off during back-off operation;
the conversion joint 3 is used for realizing conversion from a high torsion-resistant type to a drill tool buckling type;
the reverse-thread male cone 1, the high-torsion-resistance drill collar 2 and the adapter 3 are sequentially axially connected in a threaded manner from bottom to top;
the tail end (namely the upper part) of the high anti-torsion drill collar 2 is connected with the head end (namely the lower part) of the adapter 3, the tail end (namely the upper part) of the reverse thread male cone 1 is connected with the head end (namely the lower part) of the high anti-torsion drill collar 2 through splines and spline grooves, so that the high anti-torsion drill collar 2 is prevented from rotating relative to the adapter 3 and the reverse thread male cone 1 is prevented from rotating relative to the high anti-torsion drill collar 2, the high anti-torsion drill collar can bear larger torque, and meanwhile, the threads on the connecting sleeve 5 are prevented from bearing external torque; the connecting sleeve 5 is arranged on the outer side of the tail end (namely the upper part) of the high anti-torsion drill collar 2 and the head end (namely the lower part) of the adapter 3, threads are respectively arranged at the head end and the tail end of the connecting sleeve 5, the outer wall of the tail end (namely the upper part) of the high anti-torsion drill collar 2 is connected with the inner wall of the tail end (namely the lower part) of the connecting sleeve 5 through the threads, the outer wall of the head end (namely the lower part) of the adapter 3 is connected with the inner wall of the head end (namely the upper part) of the connecting sleeve 5 through the threads, and the threaded connection of the high anti-torsion drill collar 2 and the adapter 3 with the connecting sleeve 2 can bear the tensile force.
A drill 4 is mounted on the crossover joint 3.
The high anti-torsion drill collar comprises a high anti-torsion drill collar 2, an adapter 3, a first sealing ring 6, a second sealing ring 7, a third sealing ring 8, a through hole and a plug 7, wherein the first sealing ring 6 is arranged on a contact surface of the high anti-torsion drill collar 2 and the adapter 3, the second sealing ring 7 is arranged on a contact surface of the connecting sleeve 5 and the adapter 3, the third sealing ring 8 is arranged on a contact surface of the connecting sleeve 5 and the high anti-torsion drill collar 2, the first sealing ring 6, the second sealing ring 7 and the third sealing ring 8 are used for guaranteeing the sealing performance among the high anti-torsion drill collar 2, the adapter 3 and the connecting sleeve 5, the outer wall of the tail end (namely the lower part) of the connecting sleeve 5 is uniformly provided with the through hole along the circumferential direction, and the plug 7 is arranged on the through hole.
The outer surface of the head end (namely the lower part) of the adapter 3 is provided with three steps, the upper step is uniformly provided with external threads and a second sealing ring groove along the circumferential direction, the middle step is uniformly provided with splines along the circumferential direction, and the lower step is uniformly provided with a first sealing ring groove along the circumferential direction; two sections of steps are arranged on the inner surface of the tail end (namely the upper part) of the high anti-torsion drill collar 2, spline grooves are uniformly formed in the upper step along the circumferential direction, and the splines on the adapter 3 correspond to the spline grooves on the high anti-torsion drill collar 2 one by one. The size of one group of splines and spline grooves is larger than that of the other groups of splines and spline grooves, and third sealing ring grooves and external threads are uniformly arranged on the lower step along the circumferential direction.
Example two
The fishing string is 2-3.5 inches, i.e., 2 "-3-1/2", in size based on example one.
The fishing string has tensile strength of 500-700KN, preferably 600 KN.
The maximum twist resistance of the fishing string is 10-15KN.m, preferably 12 KN.m.
EXAMPLE III
A salvaging method of a salvaging pipe column with high torsion resistance is carried out according to the following steps:
step 1, feeding the fishing pipe column into the underground, and firmly grabbing the underground fish in a mode of reversing and making a button by using a reverse thread male cone;
Step 3, back-off operation: if the fishing pipe column cannot be unlocked by up-and-down movement and jarring, the fishing pipe column is lifted to a preset hanging weight, the neutral point of the fishing pipe column is located at the expected opening depth of the underground fish, the fishing pipe column is rotated anticlockwise on the ground, the torque is transmitted to the underground fish, when the torque applied by the fishing pipe column exceeds the screw tightening torque of the fish, the underground fish is opened, the fishing pipe column is lifted after continuous reversal, the fish above a tripping part can be recovered out of the well, and the back-off fishing operation is completed.
In step 2, the tensile strength of the fishing string is 500-700 KN.
In step 3, the maximum twist resistance of the fishing string is 10-15 KN.m.
Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.
The present invention has been described in detail, but the above description is only a preferred embodiment of the present invention, and is not to be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The utility model provides a high antitorque back-off salvage tubular column which characterized in that: the anti-twist drill collar comprises a reverse-thread male cone, a high-anti-twist drill collar and a conversion joint;
the reverse-thread male cone is used for firmly grabbing the fish falling in the well;
the high torsion-resistant drill collar is used for realizing independent transmission of torque and axial force and avoiding the reverse opening of the buckle during the reverse buckling operation;
the conversion joint is used for realizing conversion from a high torsion resistance type to a drilling tool buckling type;
the reverse-thread male cone, the high-torsion-resistance drill collar and the adapter are sequentially connected in a thread manner from bottom to top;
the upper part of the high anti-torsion drill collar is connected with the lower part of the adapter and the upper part of the reverse-thread male cone is connected with the lower part of the high anti-torsion drill collar through splines and spline grooves, so that the high anti-torsion drill collar and the adapter as well as the reverse-thread male cone and the high anti-torsion drill collar are prevented from rotating relatively and can bear large torque, and meanwhile, the threads on the connecting sleeve can not bear external torque; connecting sleeves are arranged on the outer sides of the upper portion of the high anti-torsion drill collar and the lower portion of the adapter, threads are respectively arranged at the upper end and the lower end of each connecting sleeve, the outer wall of the upper portion of the high anti-torsion drill collar is connected with the inner wall of the lower portion of each connecting sleeve through the threads, the outer wall of the lower portion of the adapter is connected with the inner wall of the upper portion of each connecting sleeve through the threads, and the high anti-torsion drill collar, the adapter and the connecting sleeves are in threaded connection and can bear the tensile force.
2. A high torque back-off resistance fishing string as claimed in claim 1, wherein: and installing a drilling tool on the adapter.
3. A high torque back-off resistance fishing string as claimed in claim 2, wherein: the high anti-torsion drill collar is characterized in that a first sealing ring is arranged on a contact surface of the high anti-torsion drill collar and the adapter, a second sealing ring is arranged on a contact surface of the connecting sleeve and the adapter, a third sealing ring is arranged on a contact surface of the connecting sleeve and the high anti-torsion drill collar, the first sealing ring, the second sealing ring and the third sealing ring are used for guaranteeing the sealing performance among the high anti-torsion drill collar, the adapter and the connecting sleeve, through holes are uniformly formed in the outer wall of the lower portion of the connecting sleeve along the circumferential direction, and plugs are arranged on the through holes.
4. A high torque back-off resistance fishing string as claimed in claim 3, wherein: the outer surface of the lower part of the adapter is provided with three sections of steps, the upper step is uniformly provided with external threads and a second sealing ring groove along the circumferential direction, the middle step is uniformly provided with splines along the circumferential direction, and the lower step is uniformly provided with a first sealing ring groove along the circumferential direction; the inner surface of the upper portion of the high anti-torsion drill collar is provided with two sections of steps, spline grooves are uniformly formed in the steps of the upper portion in the circumferential direction, splines on the adapter correspond to the spline grooves on the high anti-torsion drill collar one to one, the size of one group of splines and the spline grooves is larger than that of the other groups of splines and the spline grooves, and third sealing ring grooves and external threads are uniformly formed in the steps of the lower portion in the circumferential direction.
5. A high torque resistant back-off fishing string as claimed in claim 4, wherein: the fishing string is 2-3.5 inches in size.
6. A high torque resistant back-off fishing string as claimed in claim 5, wherein: the tensile strength of the fishing string is 500-700KN, and the maximum torsion resistance of the fishing string is 10-15KN.
7. The utility model provides a high antitorque back-off salvage tubular column's salvage method which characterized in that: the method comprises the following steps.
Step 1, feeding the fishing pipe column into the underground, and firmly grabbing the underground fish in a mode of reversing and making a button by using a reverse thread male cone;
step 2, fishing operation: when the underground fish is grabbed firmly and lifted up for releasing the jam, the axial force of the fishing pipe column is transmitted and born by the thread threads connected with the fishing pipe column, and the jam can be released in an up-and-down moving or shocking mode;
step 3, back-off operation: if the fishing pipe column cannot be unlocked by up-and-down movement and jarring, the fishing pipe column is lifted to a preset hanging weight, the neutral point of the fishing pipe column is located at the expected opening depth of the underground fish, the fishing pipe column is rotated anticlockwise on the ground, the torque is transmitted to the underground fish, when the torque applied by the fishing pipe column exceeds the screw tightening torque of the fish, the underground fish is opened, the fishing pipe column is lifted after continuous reversal, the fish above a tripping part can be recovered out of the well, and the back-off fishing operation is completed.
8. A method of fishing a fishing string against high torque back-off as claimed in claim 7, wherein: in step 2, the tensile strength of the fishing string is 500-700 KN.
9. A method of fishing a fishing string against high torque back-off as claimed in claim 7, wherein: in step 3, the maximum twist resistance of the fishing string is 10-15 KN.m.
10. Use of a high torque back off fishing string as claimed in any of claims 1 to 6 in a fishing over a central pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010885224.0A CN113250639A (en) | 2020-08-28 | 2020-08-28 | High-torsion-resistance back-off fishing pipe column and fishing method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010885224.0A CN113250639A (en) | 2020-08-28 | 2020-08-28 | High-torsion-resistance back-off fishing pipe column and fishing method and application thereof |
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| Publication Number | Publication Date |
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| CN113250639A true CN113250639A (en) | 2021-08-13 |
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|---|---|---|---|
| CN202010885224.0A Pending CN113250639A (en) | 2020-08-28 | 2020-08-28 | High-torsion-resistance back-off fishing pipe column and fishing method and application thereof |
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|---|---|---|---|---|
| CN2228970Y (en) * | 1995-08-18 | 1996-06-12 | 长庆石油勘探局钻采工艺研究院 | Combined drill collar device |
| CN201567995U (en) * | 2009-07-31 | 2010-09-01 | 中国石油集团西部钻探工程有限公司克拉玛依钻井工艺研究院 | Positive inverted back-off device assembly |
| CN201778685U (en) * | 2010-07-28 | 2011-03-30 | 中国石油天然气股份有限公司 | Torque-resistant drill collar for petroleum drilling |
| US20150226018A1 (en) * | 2014-02-07 | 2015-08-13 | Toby Scott Baudoin | Downhole Separation Apparatus and Method |
| CN204899829U (en) * | 2015-07-30 | 2015-12-23 | 中国石油集团长城钻探工程有限公司 | Cover mills back -off integration fishing device |
| CN106869848A (en) * | 2017-02-21 | 2017-06-20 | 中国石油集团渤海钻探工程有限公司 | Reaming fishing integrated tool and its fishing method |
| CN107035322A (en) * | 2017-06-09 | 2017-08-11 | 贵州高峰石油机械股份有限公司 | A kind of method and structure of positive and negative high antitorque anti-back button |
| CN108331536A (en) * | 2018-01-25 | 2018-07-27 | 中国海洋石油集团有限公司 | A kind of small drill collar joint of novel torsion-resistant |
| CN210105775U (en) * | 2019-06-13 | 2020-02-21 | 中国石油集团西部钻探工程有限公司 | While-drilling back-off device |
-
2020
- 2020-08-28 CN CN202010885224.0A patent/CN113250639A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2228970Y (en) * | 1995-08-18 | 1996-06-12 | 长庆石油勘探局钻采工艺研究院 | Combined drill collar device |
| CN201567995U (en) * | 2009-07-31 | 2010-09-01 | 中国石油集团西部钻探工程有限公司克拉玛依钻井工艺研究院 | Positive inverted back-off device assembly |
| CN201778685U (en) * | 2010-07-28 | 2011-03-30 | 中国石油天然气股份有限公司 | Torque-resistant drill collar for petroleum drilling |
| US20150226018A1 (en) * | 2014-02-07 | 2015-08-13 | Toby Scott Baudoin | Downhole Separation Apparatus and Method |
| CN204899829U (en) * | 2015-07-30 | 2015-12-23 | 中国石油集团长城钻探工程有限公司 | Cover mills back -off integration fishing device |
| CN106869848A (en) * | 2017-02-21 | 2017-06-20 | 中国石油集团渤海钻探工程有限公司 | Reaming fishing integrated tool and its fishing method |
| CN107035322A (en) * | 2017-06-09 | 2017-08-11 | 贵州高峰石油机械股份有限公司 | A kind of method and structure of positive and negative high antitorque anti-back button |
| CN108331536A (en) * | 2018-01-25 | 2018-07-27 | 中国海洋石油集团有限公司 | A kind of small drill collar joint of novel torsion-resistant |
| CN210105775U (en) * | 2019-06-13 | 2020-02-21 | 中国石油集团西部钻探工程有限公司 | While-drilling back-off device |
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Application publication date: 20210813 |