CN111364933B - Sand prevention supporting device - Google Patents
Sand prevention supporting device Download PDFInfo
- Publication number
- CN111364933B CN111364933B CN202010028790.XA CN202010028790A CN111364933B CN 111364933 B CN111364933 B CN 111364933B CN 202010028790 A CN202010028790 A CN 202010028790A CN 111364933 B CN111364933 B CN 111364933B
- Authority
- CN
- China
- Prior art keywords
- outer cylinder
- ring
- mandrel
- rupture disc
- pressure difference
- 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.)
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Links
- 239000004576 sand Substances 0.000 title claims abstract description 18
- 230000002265 prevention Effects 0.000 title description 5
- 238000007789 sealing Methods 0.000 claims description 47
- 239000000428 dust Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 239000007790 solid phase Substances 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 6
- 238000010008 shearing Methods 0.000 abstract description 5
- 238000004062 sedimentation Methods 0.000 abstract description 3
- 230000002706 hydrostatic effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells
- E21B23/06—Apparatus for displacing, setting, locking, releasing, or removing tools, packers or the like in the boreholes or wells for setting packers
Abstract
The invention discloses a sand control bearing device which comprises a mandrel, a pressure difference outer cylinder, a rupture disc outer cylinder and a dust-proof ring, wherein the mandrel, the pressure difference outer cylinder, the rupture disc outer cylinder and the dust-proof ring are integrally formed, when the pressure difference outer cylinder is subjected to the action of external force, a shearing pin between the pressure difference outer cylinder and the rupture disc outer cylinder is sheared, at the moment, the pressure difference outer cylinder moves upwards along the mandrel, and the dust-proof ring is extruded and deformed to be contacted with the inner wall of a sleeve and separate a sedimentation channel, so that solid-phase substances can be prevented from being deposited on the upper part of a packer. And the dustproof ring is uniformly provided with pressure transmission holes, so that the pressure of the pressure difference outer cylinder to the dustproof ring is continuously transmitted through the pressure transmission holes after the dustproof ring is deformed.
Description
Technical Field
The invention relates to the technical field of oil and gas wells, in particular to a sand prevention supporting device.
Background
In the Tarim block, the removable packer is widely applied to the petroleum engineering fields such as oil testing completion, downhole operation, well repair operation and the like due to the convenience of carrying out well bore operation in the later stage. However, the slurry, annulus protection liquid and the like are easy to deposit due to solid phase under high temperature and high pressure conditions, and the well casing can be corroded and peeled off under well medium conditions, so that excessive solid phase substances can be deposited on the upper part of the packer along with the extension of time, and the problems of difficult final deblocking of the packer, tool embedding and the like are caused. Moreover, the problem of buried clamp of the operation pipe column is easily caused by sand discharge of the water layer at the upper part of the self-flow water injection operation.
Disclosure of Invention
The invention aims to provide a sand prevention supporting device which can prevent solid phase substances from being deposited on the upper part of a packer and effectively solve the problems of difficult packer deblocking, tool embedding and the like.
In order to achieve the naming purpose of the invention, the technical scheme adopted by the invention comprises the following specific contents:
the utility model provides a sand control supporting device, includes integrated into one piece's dabber, pressure differential urceolus, rupture disc urceolus and dust ring, the rupture disc urceolus with pressure differential urceolus cup joints in proper order from the bottom up the dabber is in the dust ring cup joints the dabber is epaxial, and with the upper end of pressure differential urceolus is connected, the rupture disc urceolus with dabber threaded connection, pressure differential urceolus is through shearing pin connection the rupture disc urceolus.
As the preferable of the scheme, the dustproof ring is uniformly provided with a plurality of pressure transmission holes.
Preferably, the sand control bearing device further comprises a positioning ring sleeved on the mandrel, and the positioning ring is connected with the dust-proof ring.
Preferably, the positioning ring is connected with the mandrel through a first fastening pin, and the lower end of the outer cylinder of the rupture disc is connected with the mandrel through a second fastening pin.
As a preferable mode of the scheme, two first sealing air chambers are arranged between the upper end of the pressure difference outer cylinder and the mandrel, each first sealing air chamber comprises a first O-shaped sealing ring and a first mounting groove for accommodating the first O-shaped sealing ring, and the first mounting groove is arranged on the pressure difference outer cylinder or the mandrel.
As preferable of the above scheme, two second sealing air chambers are arranged between the middle part of the pressure difference outer cylinder and the mandrel, each second sealing air chamber comprises a second O-shaped sealing ring and a second mounting groove for accommodating the second O-shaped sealing ring, and the second mounting groove is arranged on the pressure difference outer cylinder or the mandrel.
As a preferable aspect of the above, two third seal air chambers are provided between the lower end of the differential pressure outer tube and the rupture disc outer tube, and each of the third seal air chambers includes a third O-ring and a third mounting groove for receiving the third O-ring, and the third mounting groove is provided on the differential pressure outer tube or the rupture disc outer tube.
As a preferable aspect of the above, two fourth sealing air chambers are provided between the lower end of the outer disc cartridge and the spindle, and each of the fourth sealing air chambers includes a fourth O-ring and a fourth mounting groove for receiving the fourth O-ring, and the fourth mounting groove is provided on the outer disc cartridge or the spindle.
Preferably, the sand control support device further comprises a rupture disc, and the rupture disc is connected with the outer disc cylinder through threads.
Compared with the prior art, the invention has the beneficial effects that:
1. the sand control supporting device disclosed by the invention comprises a mandrel, a pressure difference outer cylinder, a rupture disc outer cylinder and a dust-proof ring which are integrally formed, wherein after the pressure difference outer cylinder is subjected to the action of external force, a shearing pin between the pressure difference outer cylinder and the rupture disc outer cylinder is sheared, at the moment, the pressure difference outer cylinder moves upwards along the mandrel, and the dust-proof ring is contacted with the inner wall of a sleeve and cuts off a sedimentation channel after being subjected to extrusion deformation, so that solid-phase substances can be prevented from being deposited on the upper part of a packer.
2. And pressure transmission holes are uniformly formed in the dustproof ring, so that the pressure of the pressure difference outer cylinder to the dustproof ring is continuously transmitted through the pressure transmission holes after the dustproof ring is deformed.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention, as well as the preferred embodiments thereof, together with the following detailed description of the invention, given by way of illustration only, together with the accompanying drawings.
Drawings
FIG. 1 is a schematic view of a sand control bearing device according to the present invention;
wherein, the reference numerals in fig. 1 are:
1. a mandrel; 2. a positioning ring; 3. a differential pressure outer cylinder; 4. a first support ring; 5. a dust-proof ring; 6. an outer cartridge of rupture disc; 7. a first O-ring seal; 8. a second O-ring seal; 9. a second support ring; 10. a first locking pin; 11. shearing pins; 12. a second locking pin; 13. a rupture disc; 14. a third O-ring seal; 15. a third support ring; 16. a fourth O-ring seal; 17. and a fourth support ring.
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following detailed description is given below of the specific implementation, structure, characteristics and effects according to the invention with reference to the accompanying drawings and preferred embodiments:
as shown in fig. 1, the sand control supporting device disclosed by the invention comprises a mandrel 1, a differential pressure outer cylinder 3, a rupture disc outer cylinder 6 and a dust ring 5 which are integrally formed, wherein the rupture disc outer cylinder 6 and the differential pressure outer cylinder 3 are sequentially sleeved on the mandrel 1 from bottom to top, the dust ring 5 is sleeved on the mandrel 1 and is connected with the upper end of the differential pressure outer cylinder 3, the rupture disc outer cylinder 6 is in threaded connection with the mandrel 1, and the differential pressure outer cylinder 3 is connected with the rupture disc outer cylinder 6 through a shear pin 11.
When setting is carried out, the ground insulating pressure generated by hydrostatic column pressure and additional pressure applied by a shaft directly acts on the lower piston surface of the differential pressure outer cylinder 3, and after the shearing pin 11 is sheared by the generated piston force, the differential pressure outer cylinder 3 is pushed to move upwards along the mandrel 1 and push the dustproof ring 5, so that the dustproof ring 5 is extruded and deformed under the pushing action of the differential pressure outer cylinder 3, and after deformation, the dustproof ring 5 is contacted with the inner wall of a sleeve and blocks a sedimentation channel, thereby avoiding solid phase substances from being deposited on the upper part of a packer. When the packer needs to be unpacked, after sediment substances on the upper part of the anti-settling ring are positively and circularly washed away through a circulating valve on the pipe column, the sand control supporting device can be lifted out together with the pipe column after the unpacked packer is directly lifted.
A plurality of pressure transmission holes are uniformly formed in the dustproof ring 5, so that the pressure of the pressure difference outer cylinder 3 to the dustproof ring 5 is continuously transmitted through the pressure transmission holes after the dustproof ring 5 is deformed; moreover, the pressure transmission holes on the dustproof ring 5 are uniformly arranged, so that the same acting force applied to different positions of the dustproof ring 5 can be ensured.
The sand control supporting device further comprises a positioning ring 2 sleeved on the mandrel 1, the positioning ring 2 is connected with the dustproof ring 5, and the dustproof ring 5 can be ensured to be normally compressed and clung to the inner wall of the differential pressure outer cylinder 3 after being started so as to isolate a ring control space.
In order to avoid the position change of the positioning ring 2 and the outer rupture disc cylinder 6 caused by the external force, the positioning ring 2 is connected with the mandrel 1 through a first fastening pin 10, and the lower end of the outer rupture disc cylinder 6 is connected with the mandrel 1 through a second fastening pin 12.
Two first sealing air chambers are arranged between the upper end of the differential pressure outer cylinder 3 and the mandrel 1, and the pressure inside the two first sealing air chambers is zero, so that the differential pressure outer cylinder 3 can be pushed upwards under the action of hydrostatic column pressure and the ground insulating pressure generated by the extra pressure applied by the shaft. Moreover, each of the first seal air chambers includes a first O-ring 7 and a first mounting groove for accommodating the first O-ring 7, and the first mounting groove is provided on the differential pressure outer cylinder 3 or the mandrel 1, so that when the first O-ring 7 is mounted in the first mounting groove, the first O-ring 7 is compressed such that there is no gap on both sides of the first O-ring 7, thereby isolating external pressure from entering between the differential pressure outer cylinder 3 and the mandrel 1.
In addition, in order to ensure that the first O-ring 7 still has higher sealing performance when being subjected to external force, the first sealing air cavity further comprises a first supporting ring 4, and the first O-ring 7 is sleeved on the first supporting ring 4, so that on one hand, the stability of the first O-ring 7 can be improved through the first supporting ring 4; on the other hand, the first O-ring 7 has a high sealing performance under the combined action of the first support ring 4 and the mandrel 1.
As a preferable mode of the scheme, two second sealing air chambers are arranged between the middle part of the differential pressure outer cylinder 3 and the mandrel 1, and the pressure inside the two second sealing air chambers is zero, so that the differential pressure outer cylinder 3 can be pushed upwards under the action of the hydrostatic column pressure and the ground insulating pressure generated by the extra pressure applied by the shaft. Moreover, each of the second sealing air chambers includes a second O-ring 8 and a second mounting groove for accommodating the second O-ring 8, and the second mounting groove is provided on the differential pressure outer cylinder 3 or the mandrel 1, so that when the second O-ring 8 is mounted in the second mounting groove, the second O-ring 8 is compressed such that there is no gap on both sides of the second O-ring 8, thereby isolating external pressure from entering between the differential pressure outer cylinder 3 and the mandrel 1.
In addition, in order to ensure that the second O-ring 8 still has higher sealing performance when being subjected to external force, the second sealing air cavity further comprises a second supporting ring 9, and the second O-ring 8 is sleeved on the second supporting ring 9, so that on one hand, the stability of the second O-ring 8 can be improved through the second supporting ring 9; on the other hand, the second O-ring 8 has a high sealing performance under the combined action of the second support ring 9 and the mandrel 1.
Two third sealing air chambers are arranged between the lower end of the pressure difference outer cylinder 3 and the rupture disc outer cylinder 6, and the pressure inside the two third sealing air chambers is zero, so that the pressure difference outer cylinder 3 can be pushed upwards under the action of hydrostatic column pressure and the ground insulating pressure generated by the additional pressure applied by a shaft. Moreover, each of the third seal air chambers includes a third O-ring 14 and a third mounting groove for receiving the third O-ring 14, and the third mounting groove is provided on the differential pressure outer tube 3 or the rupture disc outer tube 6, so that when the third O-ring 14 is mounted in the third mounting groove, the third O-ring 14 will be compressed such that there is no gap on both sides of the third O-ring 14, thereby isolating external pressure from entering between the differential pressure outer tube 3 and the rupture disc outer tube 6.
In addition, in order to ensure that the third O-ring 14 still has higher sealing performance when being subjected to external force, the third sealing air chamber further comprises a third supporting ring 15, and the third O-ring 14 is sleeved on the third supporting ring 15, so that on one hand, the stability of the third O-ring 14 can be improved through the third supporting ring 15; on the other hand, the third O-ring 14 has a high sealing performance under the combined action of the third support ring 15 and the differential pressure outer cylinder 3.
Two fourth sealing air chambers are arranged between the lower end of the outer rupture disc cylinder 6 and the mandrel 1, and the pressure inside the two fourth sealing air chambers is zero, so that the outer rupture disc cylinder 6 can be pushed upwards under the action of hydrostatic column pressure and the insulating pressure generated by the additional pressure applied by a shaft. Moreover, each of the fourth seal air chambers includes a fourth O-ring 16 and a fourth mounting groove for receiving the fourth O-ring 16, and the fourth mounting groove is provided on the outer disc cartridge 6 or the spindle 1, so that, when the fourth O-ring 16 is mounted in the fourth mounting groove, the fourth O-ring 16 will be compressed such that there is no gap on both sides of the fourth O-ring 16, thereby isolating external pressure from entering between the outer disc cartridge 6 and the spindle 1.
In addition, in order to ensure that the fourth O-ring 16 still has higher sealing performance when being subjected to external force, the fourth sealing air chamber further comprises a fourth supporting ring 17, and the fourth O-ring 16 is sleeved on the fourth supporting ring 17, so that on one hand, the stability of the fourth O-ring 16 can be improved through the fourth supporting ring 17; on the other hand, the fourth O-ring 16 has a high sealing performance under the combined action of the fourth supporting ring 17 and the mandrel 1.
As the scheme is preferable, the sand prevention supporting device further comprises a rupture disc 13, and the rupture disc 13 is connected with the outer cylinder 6 of the rupture disc through threads, so that the situation that the hydrostatic column pressure and the ground insulating pressure generated by the extra pressure applied by a shaft directly act on the lower differential pressure area of the outer cylinder 3 of the differential pressure can be effectively avoided, and the device is started in advance in the running process of a pipe column.
It should be noted that in the description of the present invention, the terms "first," "second," "third," and "fourth," etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (1)
1. A sand control supporting device, characterized in that: the anti-dust pressure-drop device comprises an integrally formed mandrel, a pressure difference outer cylinder, a rupture disc outer cylinder and a dust-proof ring, wherein the rupture disc outer cylinder and the pressure difference outer cylinder are sequentially sleeved on the mandrel from bottom to top, the dust-proof ring is sleeved on the mandrel and is connected with the upper end of the pressure difference outer cylinder, the rupture disc outer cylinder is in threaded connection with the mandrel, and the pressure difference outer cylinder is connected with the rupture disc outer cylinder through a shear pin; the sand control supporting device further comprises a positioning ring sleeved on the mandrel, the positioning ring is connected with the dust control ring, the positioning ring is connected with the mandrel through a first fastening pin, and the lower end of the outer cylinder of the rupture disc is connected with the mandrel through a second fastening pin;
two first sealing air chambers are arranged between the upper end of the pressure difference outer cylinder and the mandrel, each first sealing air chamber comprises a first O-shaped sealing ring and a first mounting groove for accommodating the first O-shaped sealing ring, and the first mounting grooves are arranged on the pressure difference outer cylinder or the mandrel; two second sealing air chambers are arranged between the middle part of the pressure difference outer cylinder and the mandrel, each second sealing air chamber comprises a second O-shaped sealing ring and a second mounting groove for accommodating the second O-shaped sealing ring, and the second mounting groove is arranged on the pressure difference outer cylinder or the mandrel; two third sealing air chambers are arranged between the lower end of the pressure difference outer cylinder and the rupture disc outer cylinder, each third sealing air chamber comprises a third O-shaped sealing ring and a third mounting groove for accommodating the third O-shaped sealing ring, and the third mounting groove is arranged on the pressure difference outer cylinder or the rupture disc outer cylinder; two fourth sealing air chambers are arranged between the lower end of the outer rupture disc cylinder and the mandrel, each fourth sealing air chamber comprises a fourth O-shaped sealing ring and a fourth mounting groove for accommodating the fourth O-shaped sealing ring, and the fourth mounting grooves are arranged on the outer rupture disc cylinder or the mandrel; the sand control support device also comprises a rupture disc, and the rupture disc is connected with the outer cylinder of the rupture disc through threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010028790.XA CN111364933B (en) | 2020-01-11 | 2020-01-11 | Sand prevention supporting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010028790.XA CN111364933B (en) | 2020-01-11 | 2020-01-11 | Sand prevention supporting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111364933A CN111364933A (en) | 2020-07-03 |
| CN111364933B true CN111364933B (en) | 2024-01-30 |
Family
ID=71206226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010028790.XA Active CN111364933B (en) | 2020-01-11 | 2020-01-11 | Sand prevention supporting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111364933B (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5109925A (en) * | 1991-01-17 | 1992-05-05 | Halliburton Company | Multiple stage inflation packer with secondary opening rupture disc |
| US5193621A (en) * | 1991-04-30 | 1993-03-16 | Halliburton Company | Bypass valve |
| US5341883A (en) * | 1993-01-14 | 1994-08-30 | Halliburton Company | Pressure test and bypass valve with rupture disc |
| US5400855A (en) * | 1993-01-27 | 1995-03-28 | Halliburton Company | Casing inflation packer |
| US5582253A (en) * | 1995-06-02 | 1996-12-10 | Baker Hughes Incorporated | Debris barrier with a downhole tool setting assembly |
| CA2367491A1 (en) * | 1999-04-21 | 2000-10-26 | Schlumberger Canada Limited | Wellbore packer with rupture disc |
| CN200982173Y (en) * | 2006-12-14 | 2007-11-28 | 大港油田集团有限责任公司 | Hydraulic type sand-blocking control leather bowl |
| CN203175480U (en) * | 2013-01-10 | 2013-09-04 | 中国石油天然气股份有限公司 | Internal-pressure type RDS circulating valve |
| CN204457614U (en) * | 2015-02-04 | 2015-07-08 | 中曼石油天然气集团股份有限公司北京国际钻井工程分公司 | A kind of two disc type circulating valve that breaks |
| CN205189848U (en) * | 2015-06-10 | 2016-04-27 | 北京日升恒诚能源技术开发有限公司 | Discodactylous that breaks end well cementation fracturing sliding sleeve |
| CN110259408A (en) * | 2019-07-17 | 2019-09-20 | 中石化石油工程技术服务有限公司 | A kind of oil/gas well packing completion system |
| CN110566146A (en) * | 2019-09-30 | 2019-12-13 | 中国石油集团川庆钻探工程有限公司 | Internal pressurization type power mandrel and underground power device for oil testing well completion |
| CN212130435U (en) * | 2020-01-11 | 2020-12-11 | 中石化石油工程技术服务有限公司 | Sand control supporting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7604048B2 (en) * | 2006-11-21 | 2009-10-20 | Baker Hughes Incorporated | Spring energized debris barrier for mechanically set retrievable packer |
| US7913770B2 (en) * | 2008-06-30 | 2011-03-29 | Baker Hughes Incorporated | Controlled pressure equalization of atmospheric chambers |
| US8881802B2 (en) * | 2011-11-30 | 2014-11-11 | Baker Hughes Incorporated | Debris barrier for packer setting sleeve |
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Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5109925A (en) * | 1991-01-17 | 1992-05-05 | Halliburton Company | Multiple stage inflation packer with secondary opening rupture disc |
| US5193621A (en) * | 1991-04-30 | 1993-03-16 | Halliburton Company | Bypass valve |
| US5341883A (en) * | 1993-01-14 | 1994-08-30 | Halliburton Company | Pressure test and bypass valve with rupture disc |
| US5400855A (en) * | 1993-01-27 | 1995-03-28 | Halliburton Company | Casing inflation packer |
| US5582253A (en) * | 1995-06-02 | 1996-12-10 | Baker Hughes Incorporated | Debris barrier with a downhole tool setting assembly |
| CA2367491A1 (en) * | 1999-04-21 | 2000-10-26 | Schlumberger Canada Limited | Wellbore packer with rupture disc |
| CN200982173Y (en) * | 2006-12-14 | 2007-11-28 | 大港油田集团有限责任公司 | Hydraulic type sand-blocking control leather bowl |
| CN203175480U (en) * | 2013-01-10 | 2013-09-04 | 中国石油天然气股份有限公司 | Internal-pressure type RDS circulating valve |
| CN204457614U (en) * | 2015-02-04 | 2015-07-08 | 中曼石油天然气集团股份有限公司北京国际钻井工程分公司 | A kind of two disc type circulating valve that breaks |
| CN205189848U (en) * | 2015-06-10 | 2016-04-27 | 北京日升恒诚能源技术开发有限公司 | Discodactylous that breaks end well cementation fracturing sliding sleeve |
| CN110259408A (en) * | 2019-07-17 | 2019-09-20 | 中石化石油工程技术服务有限公司 | A kind of oil/gas well packing completion system |
| CN110566146A (en) * | 2019-09-30 | 2019-12-13 | 中国石油集团川庆钻探工程有限公司 | Internal pressurization type power mandrel and underground power device for oil testing well completion |
| CN212130435U (en) * | 2020-01-11 | 2020-12-11 | 中石化石油工程技术服务有限公司 | Sand control supporting device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111364933A (en) | 2020-07-03 |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20200819 Address after: 100728 Beijing, Chaoyangmen, North Street, No. 22, No. Applicant after: SINOPEC Group Applicant after: SINOPEC OILFIELD SERVICE Corp. Applicant after: SINOPEC OILFIELD SERVICE JIANGHAN Corp. Applicant after: DOWNHOLE TESTING COMPANY OF SINOPEC JIANGHAN OILFIELD SERVICE CO.,LTD. Address before: 100029, Beijing, Chaoyang District Xin Tung Street, a No. 6, Twelfth layers Applicant before: SINOPEC OILFIELD SERVICE Corp. Applicant before: SINOPEC OILFIELD SERVICE JIANGHAN Corp. Applicant before: DOWNHOLE TESTING COMPANY OF SINOPEC JIANGHAN OILFIELD SERVICE CO.,LTD. |
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