CN107503685B - Major diameter riser pipe whipstock that windows - Google Patents
Major diameter riser pipe whipstock that windows Download PDFInfo
- Publication number
- CN107503685B CN107503685B CN201710655068.7A CN201710655068A CN107503685B CN 107503685 B CN107503685 B CN 107503685B CN 201710655068 A CN201710655068 A CN 201710655068A CN 107503685 B CN107503685 B CN 107503685B
- Authority
- CN
- China
- Prior art keywords
- inclined plane
- slips
- piston
- whipstock
- piston cylinder
- 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.)
- Active
Links
- 238000004873 anchoring Methods 0.000 claims abstract description 21
- 239000007921 spray Substances 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 1
- 235000017491 Bambusa tulda Nutrition 0.000 claims 1
- 241001330002 Bambuseae Species 0.000 claims 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 1
- 239000011425 bamboo Substances 0.000 claims 1
- 210000001503 joint Anatomy 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 230000002411 adverse Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000005553 drilling Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 235000012149 noodles Nutrition 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B7/061—Deflecting the direction of boreholes the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/10—Slips; Spiders ; Catching devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells for anchoring the tools or the like
Abstract
The utility model provides a major diameter riser pipe whipstock that windows, including the inclined plane body, the cone piston, the retaining tube, the grafting connects, slips, piston cylinder and connecting cylinder, the anchoring of whipstock is realized by two sets of tube-shape slips device, every slip device of group includes a piston cylinder, a cone piston and a retaining tube, 6-8 slips of circumference equipartition in the piston cylinder wall, two sets of slips devices are by connecting cylinder back threaded connection, retaining tube one end inserts the cone piston centre bore, one end is fixed in two piston cylinder and connecting cylinder connection formation's recess, two sets of slips devices relatively rotate certain angle before welded fastening, ensure that there is a set of slips to avoid the tubular column minor axis orientation, in order to effectively overcome the adverse effect of riser pipe ovality. The tool is easy to process and assemble, has good economy and high safety and reliability, and can provide a reliable inclined guide channel for windowing of a large-diameter riser pipe.
Description
Technical Field
The invention relates to the technical field of oil and gas well shaft windowing sidetracking tools, in particular to a large-diameter riser windowing whipstock.
Background
In the oil-gas field shaft engineering technology, the windowing sidetrack is an effective mode for reducing cost and enhancing efficiency, a key tool of the windowing sidetrack is a whipstock, the whipstock generally comprises an inclined plane body and an anchoring unit, the inclined plane body is anchored at a preset well depth and a preset direction of the inner wall of a shaft by the anchoring unit in the windowing process, a milling cone is limited to mill a window on the side wall of the shaft according to a preset track, and a new channel is provided for subsequent sidetrack drilling and sidetrack horizontal well drilling construction.
At present, the common whipstock mainly aims at a sleeve with a conventional size, and the technical scheme adopted by the common whipstock is as follows: the inclined plane body and the anchoring unit are fixedly connected through threads, the cylindrical anchoring unit is provided with two groups of slips, the inner sides of the slips are conical inclined planes, each group of slips corresponds to one conical piston, the two conical pistons are arranged in the same piston cylinder, the conical directions are opposite, the same retaining tube is arranged between the two conical pistons, the conical pistons are pushed by hydraulic pressure to move relative to the slips through ball throwing and pressing, the slips are pushed to extend out and anchor the conical pistons on the inner wall of the sleeve, and the retaining tube at the center of the conical pistons locks the conical pistons to ensure anchoring and fastening of the whipstock. In a large-diameter well bore windowing whipstock tool, such as an ocean drilling platform riser whipstock tool, if the conventional technical scheme is adopted, the structural size of each part is oversized, the novel problem that is difficult to solve is faced during processing and assembly, meanwhile, due to the fact that the amount of scrap iron generated during windowing is large, well bore annulus is thick, the scrap iron is not easy to circulate out of a well mouth, the scrap iron can partially settle at the anchoring position of the whipstock, in order to clear the scrap iron, the gap between a whipstock body and a well bore needs to be increased, the scrap iron is ensured to leak through the anchoring position of the whipstock, or the diameter of a pipe body is far smaller than the anchoring inner diameter due to pipe body deformation, the maximum extending outer diameter of the whipstock is far longer than the outer diameter of the body, the conical piston is required to be longer, the piston is finally required to be oversized, the piston cylinder is required to be processed, the bevel body is extremely long and overweight, and the tool is assembled, the conditions cause the processing and the manufacturing cost of the tool is extremely large, and the tool is difficult to be realized, in addition, compared with the conventional sleeve, the existing elliptical azimuth anchoring method is required, the conventional whipstock anchoring method is not to be firm, and the conventional whipstock has low reliability and the high risk is used for the conventional whipstock.
Disclosure of Invention
The invention provides a large-diameter riser window whipstock aiming at the problems. The tool is easy to process and assemble, has high safety and reliability, can effectively overcome the adverse effect of ovality of the riser, and provides a reliable deflection tool for windowing of a large-diameter riser of an ocean drilling platform.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a major diameter pit shaft whipstock that windows, including the inclined plane body, the spray tube, go up the slips, the cone piston, the retaining tube, lower slips, the ball seat, the steel ball, the connecting cylinder, the piston cylinder, the slips shear pin, the grafting joint, the round pin axle, hoist and send into the pole, the inclined plane body adopts "T" profile structure and two round pin axle fixed connection with the anchor part, grafting joint and the piston cylinder threaded connection of last slips device, the outer screw thread of spray tube large end and grafting joint centre bore threaded connection, the inner screw thread of spray tube large end and send into pole threaded connection as the release, the spray tube tip and cone piston hole sliding seal connection constitute sealed cavity, the anchor of whipstock is realized by two sets of mutually independent slips devices, every slips device of group includes a piston cylinder, a cone piston and a retaining tube, the slips are arranged in the circumference equipartition in the cylinder wall of piston cylinder, every slips is connected by 1 slips, two sets of slips devices are by connecting cylinder threaded connection, retaining tube one end inserts cone piston centre bore, one end is fixed in two piston cylinders and connecting the recess that the connecting cylinder is formed, two sets of slips are connected, two sets of slips are rotated relative to each other, the corresponding to each slip circumferential distribution is guaranteed by a corresponding to the degree of different spacer tube, the different cross-section is guaranteed.
The inclined plane body is formed by cutting a columnar metal body through a group of planes, the uppermost end of the inclined plane is an initial inclined plane, the middle of the inclined plane is a main inclined plane, the bottommost end of the inclined plane is an auxiliary inclined plane, the lower end of the inclined plane body is of a T-shaped body structure, two parallel pin shaft holes are arranged on the side face of the T-shaped body structure, locking screw holes are respectively arranged on the outer sides of the aperture of the pin shaft, a weight reducing groove is formed in the back side of the inclined plane body inclined plane, materials are removed from the parallel inclined plane to reduce weight, the middle part of the inclined plane body is plate-shaped, and a feeding rod hole is formed in the middle of the inclined plane body.
The side of the inner hole of the large end of the piston cylinder is a conical piston working surface, the inner side of the open end of the working surface is provided with plug connector connecting threads, slip supporting grooves are circumferentially arranged below the threads, the cross section of each slip supporting groove is rectangular, the cross section of each slip supporting groove penetrates through the cylinder wall, the outer side of the small end of the piston cylinder is provided with connecting cylinder connecting threads, and the end face of each connecting cylinder is a stop tube suspension surface.
Compared with the conventional whipstock technology, the tool has larger outer diameter when in an anchoring state, and a larger gap is formed between the tool body and the windowing cylinder body, so that the tool is convenient to descend into a well and fall off from scrap iron; because two sets of slips devices correspond a piston cylinder, a cone piston and a retaining tube respectively, the two sets of slips devices can rotate relatively in the axial direction, a set of slips are ensured to avoid the short axis direction of the pipe column when the seat is hung, the adverse effect of ovality of the riser pipe on anchoring can be effectively overcome, meanwhile, the size of the external dimension of a tool part is reduced to a reasonable range, the inclined plane body and the plug connector are connected by adopting a T-shaped body structure and a pin shaft, and the tool processing and assembling difficulty is greatly reduced.
Drawings
FIG. 1 is a side cross-sectional view of a large diameter riser fenestration whipstock tool;
FIG. 2 is an enlarged view I of a portion of FIG. 1;
FIG. 3 is a front view of the large diameter riser whipstock;
FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;
FIG. 5 is a side view of a beveled body;
fig. 6 is a front view of the bevel body.
In the figure, the inclined plane body 1, the spray pipe 2, the upper slip 4, the cone piston 5, the stop pipe 6, the lower slip 7, the ball seat 8, the steel ball 9, the connecting cylinder 10, the piston cylinder 11, the slip shear pin 12, the plug connector 13, the pin shaft 14, the lifting tool 15, the feeding rod 101, the initial inclined plane 102, the main inclined plane 103, the auxiliary inclined plane 104, the locking screw hole 105, the pin shaft hole 106, the feeding rod hole 107, the weight reducing groove 108 and the T-shaped body structure.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
In the drawings 1, 2, 3 and 4, a large-diameter shaft windowing whipstock comprises a bevel body 1, a spray pipe 2, an upper slip 3, a cone piston 4, a stop pipe 5, a lower slip 6, a ball seat 7, a steel ball 8, a connecting cylinder 9, a piston cylinder 10, a slip shear pin 11, a plug connector 12, a pin shaft 13, a lifting appliance 14 and a feeding rod 15.
The inclined plane body 1 and the plug connector 12 are fixedly connected by adopting a T-shaped body structure and two pin shafts 13, the plug connector 12 is in threaded connection with the piston cylinder 10 of the upper slip device, the external thread at the large end of the spray pipe 2 is in threaded connection with the middle hole of the plug connector 12, the internal thread at the large end of the spray pipe 2 is in threaded connection with the feeding rod 15 to serve as releasing, and the small end of the spray pipe 2 is in sliding sealing connection with the inner hole of the cone piston 4 to form a sealing cavity. The anchoring of the whipstock is realized by two groups of slip devices which are mutually independent, each group of slip device comprises a piston cylinder 10, a cone piston 4 and a retaining tube 5, an upper slip 3 and a lower slip 6 are circumferentially and uniformly distributed in the cylinder wall of the piston cylinder 10 and are in inclined surface contact with the cone piston 4 and are connected by slip shear pins 11, the two groups of slip devices are connected by connecting cylinders 9 in a threaded manner, one end of the retaining tube 5 is inserted into a central hole of the cone piston 4, the other end of the retaining tube is fixed in a groove formed by connecting the two piston cylinders 10 and the connecting cylinders 9, and the two groups of slip devices are axially and relatively rotated to ensure that each circumferential determined angle corresponds to one slip so as to cope with different distribution of the ovality of the section of the riser.
As shown in fig. 5 and fig. 6, the inclined plane body 1 is formed by cutting a columnar metal body through a group of planes, the uppermost end of the inclined plane is an initial inclined plane 101, the middle is a main inclined plane 102, the lowermost end is an auxiliary inclined plane 103, the lower end of the inclined plane body 1 is a 'T' -shaped body structure 108, two parallel pin shaft holes 105 are arranged on the side surface of the 'T' -shaped body structure 108, locking screw holes 104 are respectively arranged on the radial outer sides of the pin shaft holes 105, a weight reducing groove 107 is arranged on the inclined plane back side of the inclined plane body, the parallel inclined plane removes materials to reduce weight, the middle part of the inclined plane body is plate-shaped, and the middle of the inclined plane body 1 is a feeding rod hole 106.
The side surface of the inner hole of the large end of the piston cylinder 10 is a working surface of the cone piston 4, the inner side of the open end of the working surface is provided with a splicing connector 12 for connecting threads, the rear part of the threads is circumferentially provided with a slip supporting groove, the cross section of the slip supporting groove is rectangular, the cross section of the slip supporting groove penetrates through the cylinder wall, the outer side of the small end of the piston cylinder 10 is provided with a connecting cylinder 9 for connecting threads, and the end surface of the piston cylinder is provided with a stop tube 5 for suspending noodles.
The invention relates to a large-diameter riser pipe windowing whipstock, which is used in the following process: after the whipstock is assembled, the relative angles of the two groups of slip devices are adjusted through relative rotation according to the ovality distribution condition of the riser, and then each thread connecting seam is welded and fixed, so that the slips avoid the long and short axis directions of the section of the riser when the anchor is anchored, and the adverse influence of ovality of the riser on the anchoring is finally overcome.
During field operation, the whipstock is conveyed into a well according to a preset well depth and a preset direction through the conveying rod 15, the steel ball 8 is put into the conveying pipe column, the circulating channel is plugged at the ball seat 7, and the conveying rod 15, the inclined plane body 1, the spray pipe 2, the cone piston 4, the piston cylinder 10, the connecting cylinder 9, the ball seat 7 and the steel ball 8 form a sealing cavity together. By pressing, the cone piston 4 moves relative to the piston cylinder 10 under the pushing of hydraulic pressure, and as the upper slips 3 and the lower slips 6 are arranged in the slip grooves of the piston cylinder 10 and can only extend radially and contact with the inclined surfaces of the cone piston 4 and are connected by the slip shear pins 11, the cone piston 4 pushes the upper slips 3 and the lower slips 6 to invade and anchor the inner wall of the water isolation pipe while overcoming the supporting resistance of the retaining pipe 5 and shearing the slip shear pins 11, and the retaining pipe 5 follows and locks the cone piston 4 to lock the upper slips 3 and the lower slips 6 to keep an anchored state. Lifting and pressing the feeding rod 15 down ensures reliable anchoring, rotating the feeding rod 15 for a plurality of circles, completing the releasing of the whipstock and completing the hanging of the whipstock seat.
Claims (3)
1. The utility model provides a major diameter riser pipe whipstock that windows, includes the inclined plane body, anchoring mechanism and is used for connecting the grafting joint of inclined plane body, anchoring mechanism, and wherein anchoring mechanism mainly comprises piston cylinder, cone piston and the slips device that stopping pipe, slips are constituteed, slips arrangement in piston cylinder section of thick bamboo wall circumference equipartition, characterized by: the anchoring mechanism consists of an upper slip device and a lower slip device which are mutually independent and are symmetrically arranged along the axial direction, each slip device is independently provided with a retaining tube, one end of the retaining tube is inserted into a central hole of a cone piston, the other end of the retaining tube is fixed with a piston cylinder, and the involution parts of the two slip devices are connected by a connecting cylinder; the lower end of the inclined plane body is provided with a plug with a T-shaped body structure, and the inclined plane body is axially provided with a through feeding rod hole along the center; the upper end of the plug connector is provided with a plug groove which is in plug connection fit with a T-shaped body structure plug arranged at the lower end of the inclined plane body, the lower end of the plug connector is provided with an opening, and the periphery of the plug connector is provided with a circulation hole; the plug of the inclined plane body is connected with the plug groove of the plug connector through a pin shaft, and the plug connector is connected with the anchoring mechanism through a piston cylinder of the upper slip device; the upper end of the spray pipe is fixed at the upper end part of the plug connector in a sealing way and is connected and matched with a feeding rod in a feeding rod hole of the inclined plane body, and the lower end of the spray pipe and a cone piston inner hole of the upper slip device form axial sliding sealing and matching; the slips are in sliding fit with the inclined planes of the cone pistons, and the initial butt joint surfaces of the slips and the cone pistons are connected through slips and shear nails; the side face of the inner hole at the large end of the piston cylinder is a conical piston working face, plug-in connector connecting threads are arranged at the inner side of the open end of the working face, slip supporting grooves are circumferentially arranged behind the threads, the cross section of each slip supporting groove is rectangular, the cross section of each slip supporting groove penetrates through the cylinder wall, and connecting cylinder connecting threads are arranged at the outer side of the small end of the piston cylinder.
2. The large diameter riser fenestration whipstock of claim 1 wherein: the inclined plane body is formed by cutting a columnar metal body through a group of planes, the uppermost end of the inclined plane is an initial inclined plane, the middle of the inclined plane is a main inclined plane, the bottommost end of the inclined plane body is an auxiliary inclined plane, the lower end of the inclined plane body is of a T-shaped body structure, two parallel pin shaft holes are arranged on the side face of the T-shaped body structure, locking screw holes are respectively arranged on the outer sides of the aperture of the pin shaft, a weight reducing groove is formed in the back side of the inclined plane body inclined plane, materials are removed from the parallel inclined plane to reduce weight, the middle part of the inclined plane body is plate-shaped, and a feeding rod hole is formed in the middle of the inclined plane body.
3. The large-diameter riser window whipstock according to claim 1 or 2, wherein: and two ends of the connecting cylinder are respectively in threaded connection with the small ends of the upper piston cylinder and the lower piston cylinder, and a gap between the small ends of the two piston cylinders is used for fixing the retaining pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710655068.7A CN107503685B (en) | 2017-08-03 | 2017-08-03 | Major diameter riser pipe whipstock that windows |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710655068.7A CN107503685B (en) | 2017-08-03 | 2017-08-03 | Major diameter riser pipe whipstock that windows |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107503685A CN107503685A (en) | 2017-12-22 |
| CN107503685B true CN107503685B (en) | 2024-03-01 |
Family
ID=60690490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710655068.7A Active CN107503685B (en) | 2017-08-03 | 2017-08-03 | Major diameter riser pipe whipstock that windows |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107503685B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110965966B (en) * | 2019-11-16 | 2022-02-22 | 中国海洋石油集团有限公司 | Riser reentry whipstock |
| CN112973890B (en) * | 2021-04-02 | 2022-09-13 | 山西氢电科技有限公司 | Pipeline cracking device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201756914U (en) * | 2010-06-22 | 2011-03-09 | 江苏君鑫谊石油机械有限公司 | Dragable type lateral side drill integral inclination guidance device |
| CN102418486A (en) * | 2011-12-29 | 2012-04-18 | 中国海洋石油总公司 | Anchoring tool for windowing and side drilling of branched well |
| CN202348191U (en) * | 2011-12-21 | 2012-07-25 | 中国石油集团渤海钻探工程有限公司 | One-trip window sidetrack drilling tool |
| CN203374205U (en) * | 2013-05-31 | 2014-01-01 | 中国石油集团川庆钻探工程有限公司 | Slip type whipstock |
| CN207144824U (en) * | 2017-08-03 | 2018-03-27 | 中石化石油工程技术服务有限公司 | A kind of major diameter riser pipe windowing whipstock |
-
2017
- 2017-08-03 CN CN201710655068.7A patent/CN107503685B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201756914U (en) * | 2010-06-22 | 2011-03-09 | 江苏君鑫谊石油机械有限公司 | Dragable type lateral side drill integral inclination guidance device |
| CN202348191U (en) * | 2011-12-21 | 2012-07-25 | 中国石油集团渤海钻探工程有限公司 | One-trip window sidetrack drilling tool |
| CN102418486A (en) * | 2011-12-29 | 2012-04-18 | 中国海洋石油总公司 | Anchoring tool for windowing and side drilling of branched well |
| CN203374205U (en) * | 2013-05-31 | 2014-01-01 | 中国石油集团川庆钻探工程有限公司 | Slip type whipstock |
| CN207144824U (en) * | 2017-08-03 | 2018-03-27 | 中石化石油工程技术服务有限公司 | A kind of major diameter riser pipe windowing whipstock |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107503685A (en) | 2017-12-22 |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20240122 Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Applicant after: CHINA PETROLEUM & CHEMICAL Corp. Country or region after: China Applicant after: Sinopec Petroleum Engineering Technology Service Co.,Ltd. Applicant after: SINOPEC SHENGLI PETROLEUM ENGINEERING Co.,Ltd. Applicant after: SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD. DRILLING TECHNOLOGY Research Institute Address before: 100101 Beichen West Road, Chaoyang District, Beijing 8 Beichen world center, block A 703. Applicant before: SINOPEC OILFIELD SERVICE Corp. Country or region before: China Applicant before: SINOPEC SHENGLI PETROLEUM ENGINEERING Co.,Ltd. Applicant before: SINOPEC SHENGLI PETROLEUM ENGINEERING CO., LTD. DRILLING TECHNOLOGY Research Institute |
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