CN110804427B - 一种用于低压气井压井中的可降解暂堵材料及制备方法 - Google Patents
一种用于低压气井压井中的可降解暂堵材料及制备方法 Download PDFInfo
- Publication number
- CN110804427B CN110804427B CN201911226851.7A CN201911226851A CN110804427B CN 110804427 B CN110804427 B CN 110804427B CN 201911226851 A CN201911226851 A CN 201911226851A CN 110804427 B CN110804427 B CN 110804427B
- Authority
- CN
- China
- Prior art keywords
- percent
- agent
- low
- pressure gas
- temporary plugging
- 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
- 239000000463 material Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 66
- 230000015556 catabolic process Effects 0.000 claims abstract description 30
- 238000006731 degradation reaction Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 21
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 19
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 19
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 19
- 239000003999 initiator Substances 0.000 claims abstract description 19
- 230000001737 promoting effect Effects 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 32
- 239000002202 Polyethylene glycol Substances 0.000 claims description 21
- 125000004386 diacrylate group Chemical group 0.000 claims description 21
- 229920001223 polyethylene glycol Polymers 0.000 claims description 21
- CSFWPUWCSPOLJW-UHFFFAOYSA-N lawsone Chemical group C1=CC=C2C(=O)C(O)=CC(=O)C2=C1 CSFWPUWCSPOLJW-UHFFFAOYSA-N 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 19
- 229920001577 copolymer Polymers 0.000 claims description 18
- 229920001483 poly(ethyl methacrylate) polymer Polymers 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 13
- JLTDJTHDQAWBAV-UHFFFAOYSA-N N,N-dimethylaniline Chemical compound CN(C)C1=CC=CC=C1 JLTDJTHDQAWBAV-UHFFFAOYSA-N 0.000 claims description 8
- GEMHFKXPOCTAIP-UHFFFAOYSA-N n,n-dimethyl-n'-phenylcarbamimidoyl chloride Chemical compound CN(C)C(Cl)=NC1=CC=CC=C1 GEMHFKXPOCTAIP-UHFFFAOYSA-N 0.000 claims description 8
- PTTPXKJBFFKCEK-UHFFFAOYSA-N 2-Methyl-4-heptanone Chemical compound CC(C)CC(=O)CC(C)C PTTPXKJBFFKCEK-UHFFFAOYSA-N 0.000 claims description 7
- HFCUBKYHMMPGBY-UHFFFAOYSA-N 2-methoxyethyl prop-2-enoate Chemical compound COCCOC(=O)C=C HFCUBKYHMMPGBY-UHFFFAOYSA-N 0.000 claims description 7
- CNVULGHYDPMIHD-UHFFFAOYSA-L bis[(2-hydroxybenzoyl)oxy]lead Chemical compound [Pb+2].OC1=CC=CC=C1C([O-])=O.OC1=CC=CC=C1C([O-])=O CNVULGHYDPMIHD-UHFFFAOYSA-L 0.000 claims description 7
- ZBBLRPRYYSJUCZ-GRHBHMESSA-L (z)-but-2-enedioate;dibutyltin(2+) Chemical compound [O-]C(=O)\C=C/C([O-])=O.CCCC[Sn+2]CCCC ZBBLRPRYYSJUCZ-GRHBHMESSA-L 0.000 claims description 6
- MMEDJBFVJUFIDD-UHFFFAOYSA-N 2-[2-(carboxymethyl)phenyl]acetic acid Chemical compound OC(=O)CC1=CC=CC=C1CC(O)=O MMEDJBFVJUFIDD-UHFFFAOYSA-N 0.000 claims description 6
- RXBOCDZLKBPILN-UHFFFAOYSA-N 2-propylheptyl prop-2-enoate Chemical compound CCCCCC(CCC)COC(=O)C=C RXBOCDZLKBPILN-UHFFFAOYSA-N 0.000 claims description 6
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 claims description 6
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000376 reactant Substances 0.000 claims description 6
- AFBPFSWMIHJQDM-UHFFFAOYSA-N N-methylaniline Chemical compound CNC1=CC=CC=C1 AFBPFSWMIHJQDM-UHFFFAOYSA-N 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 3
- 230000035699 permeability Effects 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 10
- 238000011084 recovery Methods 0.000 abstract description 5
- 230000004048 modification Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 58
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 12
- 239000000243 solution Substances 0.000 description 10
- 239000012530 fluid Substances 0.000 description 9
- 239000008398 formation water Substances 0.000 description 9
- 230000033558 biomineral tissue development Effects 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 6
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 6
- BAPJBEWLBFYGME-UHFFFAOYSA-N acrylic acid methyl ester Natural products COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 229910017053 inorganic salt Inorganic materials 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 229920002521 macromolecule Polymers 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 230000007281 self degradation Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000012266 salt solution Substances 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 239000004711 α-olefin Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229930192627 Naphthoquinone Natural products 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000013590 bulk material Substances 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 238000004925 denaturation Methods 0.000 description 2
- 230000036425 denaturation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005297 material degradation process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 150000002791 naphthoquinones Chemical class 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 235000019698 starch Nutrition 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 229920000881 Modified starch Polymers 0.000 description 1
- 239000004368 Modified starch Substances 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 229910001622 calcium bromide Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- WGEFECGEFUFIQW-UHFFFAOYSA-L calcium dibromide Chemical compound [Ca+2].[Br-].[Br-] WGEFECGEFUFIQW-UHFFFAOYSA-L 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Polymerisation Methods In General (AREA)
Abstract
Description
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201911226851.7A CN110804427B (zh) | 2019-12-04 | 2019-12-04 | 一种用于低压气井压井中的可降解暂堵材料及制备方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201911226851.7A CN110804427B (zh) | 2019-12-04 | 2019-12-04 | 一种用于低压气井压井中的可降解暂堵材料及制备方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN110804427A CN110804427A (zh) | 2020-02-18 |
CN110804427B true CN110804427B (zh) | 2022-02-01 |
Family
ID=69492416
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201911226851.7A Active CN110804427B (zh) | 2019-12-04 | 2019-12-04 | 一种用于低压气井压井中的可降解暂堵材料及制备方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN110804427B (zh) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111303849B (zh) * | 2020-04-02 | 2021-05-28 | 中国石油大学(华东) | 暂堵剂及其制备方法、以及高温储层暂堵转向压裂的方法 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU5816800A (en) * | 1999-06-22 | 2001-01-09 | Prad Research And Development Limited | Drilling system |
WO2008102122A1 (en) * | 2007-02-23 | 2008-08-28 | Schlumberger Technology B.V. | Wellbore treatment fluid |
CN104531115A (zh) * | 2014-12-30 | 2015-04-22 | 中国石油天然气股份有限公司 | 一种水平井控水用暂堵剂、制备方法及其应用 |
CN105089600A (zh) * | 2015-07-13 | 2015-11-25 | 中国石油大学(北京) | 暂堵转向材料辅助水平井进行拖动式水力喷射改造的方法 |
CN107922302A (zh) * | 2015-08-21 | 2018-04-17 | 阿格罗-金正株式会社 | 2‑羟基‑1,4‑萘醌的制造方法 |
CN109054788A (zh) * | 2018-08-09 | 2018-12-21 | 高阳 | 一种压裂暂堵剂及其制备方法 |
CN109294541A (zh) * | 2018-09-25 | 2019-02-01 | 中国石油天然气股份有限公司 | 一种火驱井自降解暂堵剂及其制备方法与应用 |
-
2019
- 2019-12-04 CN CN201911226851.7A patent/CN110804427B/zh active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU5816800A (en) * | 1999-06-22 | 2001-01-09 | Prad Research And Development Limited | Drilling system |
WO2008102122A1 (en) * | 2007-02-23 | 2008-08-28 | Schlumberger Technology B.V. | Wellbore treatment fluid |
CN104531115A (zh) * | 2014-12-30 | 2015-04-22 | 中国石油天然气股份有限公司 | 一种水平井控水用暂堵剂、制备方法及其应用 |
CN105089600A (zh) * | 2015-07-13 | 2015-11-25 | 中国石油大学(北京) | 暂堵转向材料辅助水平井进行拖动式水力喷射改造的方法 |
CN107922302A (zh) * | 2015-08-21 | 2018-04-17 | 阿格罗-金正株式会社 | 2‑羟基‑1,4‑萘醌的制造方法 |
CN109054788A (zh) * | 2018-08-09 | 2018-12-21 | 高阳 | 一种压裂暂堵剂及其制备方法 |
CN109294541A (zh) * | 2018-09-25 | 2019-02-01 | 中国石油天然气股份有限公司 | 一种火驱井自降解暂堵剂及其制备方法与应用 |
Non-Patent Citations (2)
Title |
---|
储层改造可降解暂堵剂的制备及表征;常冬梅等;《精细化工》;20181031;第35卷(第10期);第1746-1750页第1-2节 * |
新型抗高温水溶性暂堵剂实验研究;李丹等;《应用化工》;20111231;第40卷(第12期);全文 * |
Also Published As
Publication number | Publication date |
---|---|
CN110804427A (zh) | 2020-02-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US11053427B2 (en) | Low-density, high-strength degradable temporary pugging agent and the preparation method and use thereof | |
US10526529B2 (en) | Treatment fluids comprising viscosifying agents and methods of using the same | |
EP1485572B1 (en) | Compositions for restoring lost circulation | |
CA2523472C (en) | Well treating method to prevent or cure lost-circulation | |
EP1490580B1 (en) | High temperature seawater-based cross-linked fracturing fluids and methods | |
CN113185960B (zh) | 一种温度响应型自降解暂堵剂及其制备方法和在井筒封堵中的应用 | |
CN108300439B (zh) | 一种油气井压裂暂堵转向用水溶性暂堵剂及其制备方法 | |
CN111410943B (zh) | 一种高温快速成胶加重的复合凝胶压井胶塞及其制备方法 | |
MXPA02009684A (es) | Reduccion de viscosidad de fluidos basados en tensioactivos viscoelasticos. | |
KR20170071563A (ko) | 구역 분리 및 갱정의 무결성을 위한 경화성, 재밀봉성, 팽창성, 반응성 실란트 조성물 | |
CN104099074B (zh) | 一种体积压裂改造裂缝堵水剂及堵水施工方法 | |
US20110214859A1 (en) | Clean Viscosified Treatment Fluids and Associated Methods | |
CN110804427B (zh) | 一种用于低压气井压井中的可降解暂堵材料及制备方法 | |
US11674368B2 (en) | Salting out inhibitors for use in treatment fluids | |
CN110846014B (zh) | 一种用于低压气井中的低伤害压井液及配置方法 | |
CA2884116C (en) | Triggerable lost circulation material and method of use | |
CN108300442A (zh) | 一种页岩气压裂克服高应力差暂堵转向用暂堵剂及其制备方法 | |
CN112375552A (zh) | 一种无固相清洁低伤害压井液及其制备方法 | |
CN105441048B (zh) | 一种水溶性梳型聚合物压裂暂堵转向剂及其制备使用方法 | |
CN111849438B (zh) | 一种针对含水地层堵漏的堵漏剂及其制备方法和应用 | |
CN103952130A (zh) | 低压油气井暂堵凝胶及其制备方法 | |
CN114058359A (zh) | 深水超深水裂缝性储层钻井堵漏用高效降解凝胶体系制备方法及应用 | |
AU2014249808A1 (en) | Mechanically degradable polymers for wellbore work fluid applications | |
CN114574179A (zh) | 一种压力响应型固结堵漏剂及其制备方法与应用 | |
CN117070202B (zh) | 酸溶性高强度固结堵漏剂及其制备方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
TA01 | Transfer of patent application right |
Applicant before: CNPC CHUANQING DRILLING ENGINEERING COMPANY LIMITED ENGINEERING TECHNOLOGY Research Institute Effective date of registration: 20201202 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Applicant after: CHINA NATIONAL PETROLEUM Corp. Applicant after: CNPC Chuanqing Drilling Engineering Co.,Ltd. Address before: 710018 Shaanxi city of Xi'an province Weiyang District four road Fengcheng Changqing Technology Building Applicant before: CHINA NATIONAL PETROLEUM Corp. Applicant before: CNPC Chuanqing Drilling Engineering Co.,Ltd. |
|
TA01 | Transfer of patent application right | ||
GR01 | Patent grant | ||
GR01 | Patent grant |