CN103013488A - Slickwater fracturing fluid drag reducer and preparation method thereof - Google Patents
Slickwater fracturing fluid drag reducer and preparation method thereof Download PDFInfo
- Publication number
- CN103013488A CN103013488A CN2013100204019A CN201310020401A CN103013488A CN 103013488 A CN103013488 A CN 103013488A CN 2013100204019 A CN2013100204019 A CN 2013100204019A CN 201310020401 A CN201310020401 A CN 201310020401A CN 103013488 A CN103013488 A CN 103013488A
- Authority
- CN
- China
- Prior art keywords
- preparation
- water
- drag reducer
- oil
- initiator
- 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.)
- Granted
Links
Images
Abstract
The invention discloses drag reducer which can be applied to slickwater fracturing fluid and a method for preparing drag reducer. The method includes: adding organic salt into acrylamide and functional monomer aqueous solution to prepare an aqueous phase, adding the aqueous phase into an oil phase system consisting of surfactant and base oil under the condition of high-speed stirring to form a stable W/O (water in oil) type microemulsion system, feeding nitrogen for dispersing oxygen, and adding initiator for polymerization to form a branchless long chain structure. The polymer microemulsion is a transparent or semitransparent thermodynamic stable system, can be quickly swelled into water and is directly usable. Adding a small quantity of the drag reducer during fluid transport can improve flow quantity and reduce energy consumption to some extent, and the drag reduction effect can reach 30%-65% when the drag reducer is compared with clear water. The drag reducer has the advantages of high stability, dissolving speed and dissolving performance, convenience in use, remarkable drag reduction effects and the like and is applicable to the slickwater fracturing technology, and excellent yield increasing effects are obtained after the drag reducer is applied to field fracturing operations.
Description
Technical field
The present invention relates to hypotonic, low unconventional reservoir reconstruction field, hole, particularly a kind ofly can be applicable to of the fracturing fluid flow improver of slippery water (code name BC-12) and preparation method thereof.
Background technology
Along with starting of unconventional petroleum resources exploitation upsurge, the slippery water fracturing technique that is practically applicable to exploit the unconventional reservoir in hypotonic, low hole (adds a small amount of flow improver and some additives etc. as working fluid in clear water, during construction and add the frac job of a small amount of propping agent) day by day obtained popularization, therefore, the application of the use of additive, particularly flow improver and demand are also more and more in the slippery water fracturing liquid.
Flow improver the earliest is to adopt the method for solution polymerization to carry out, and the aqueous solution polymerization molecular weight is high, impurity is few, but because the viscosity of solution polymer product own is large, and polymer content is low, and dissolution time is long, brings great inconvenience therefore for transportation and use.To the mid-90 in 20th century, developed the method for mass polymerization, greatly improved monomer conversion and flow improver performance.But the reaction heat of the method is difficult for shedding, and produces easily the temperature runaway phenomenon in the reaction, gently then causes local superheating, and molecular weight distribution is broadened; Heavy then temperature control causes sudden and violent poly-ly, and its resistance reducing performance can be affected.A kind of polymerisation new technology-micro-emulsion polymerization that grows up over past ten years is appearance transparent or translucent, the thermodynamically stable profit co-continuous phase system that is formed by water, oil, tensio-active agent and cosurfactant.This microemulsion can directly use, molecular weight is high, and can in water, disperse rapidly, dissolution rate is fast.But there are the problems such as system is complicated, water oil ratio is larger in microemulsion.
Summary of the invention
The present invention has overcome the deficiencies in the prior art, has proposed a kind ofly can be applicable to of the fracturing fluid flow improver of slippery water (code name BC-12) and preparation method thereof, and has solved microemulsion system complicacy, a difficult problem that water oil ratio is larger.
The preparation method of slippery water fracturing liquid flow improver BC-12 of the present invention, step is as follows:
(1) outfit of water
With monomer acrylamide and function monomer MAA(methacrylic acid) in mass ratio (2～10): 1 mixes, and is dissolved in the NaCl aqueous solution of 3wt%～5wt%, and monomer acrylamide mass concentration is 30%～40%;
(2) outfit of oil phase
With compound surfactant and base oil in mass ratio (2～3): 10 mixed dissolutions form oil phase; Compound surfactant adopts nonionic surface active agent sorbitan (Span-80) and polyoxyethylene sorbitan stearate (Tween-60), and it is 8.0～9.5 that the ratio of adjustment Span-80 and Tween-60 makes the HLB value of system;
(3) conversed phase micro emulsion copolymerization
Oil phase in the step (2) is joined in the reactor, and reactor is placed 30～50 ℃ thermostat water bath, logical nitrogen flooding oxygen 10～20min; Water in the step (1) is placed dropping funnel, slowly splash in the reactor under high-speed stirring, 20～30min dropwises, after continuing to lead to the fully emulsified 30～40min of nitrogen high-speed stirring; Initiator is splashed in the reactor, at the reaction 1～2h of situation about stirring, polyreaction is finished, and obtains required flow improver again.
Wherein, the described aqueous pH values of step (1) is 7～10.
Wherein, the mass ratio of the described tensio-active agent Span-80 of step (2) and Tween-60 is (1.18～2): 1.
Wherein, the described base oil of step (2) is one or more in white oil, kerosene, cyclohexane, the isoparaffin.
Wherein, the described water of step (1) and the described oil phase mass ratio of step (2) are (2～0.9): 1.
Wherein, the described initiator of step (3) is acrylamide derivative and the K of Potassium Persulphate/sodium bisulfite redox initiator, azo-initiator or tertiary amine groups
2S
2O
8In the redox initiator that forms one or more, addition is 0.15%～0.35% of monomer acrylamide weight.
Wherein, the described initiation reaction temperature of step (3) is 35～45 ℃.
In the preparation process of the present invention flow improver BC-12 in the slippery water fracturing liquid, do not add assistant for emulsifying agent in the microemulsion system, reduced system complex exponent.Use the minimum water oil ratio of complexed surfactant can reach 3:5.The flow improver outward appearance that the method is produced is transparent or semitransparent microemulsion, and good stability can directly use, and can be in water disperses rapidly, dissolution rate is fast.The flow improver of the method being produced by the flowing loop friction drag test macro carries out friction test, compares with clear water, and drag reducing efficiency can reach 30%～65%.And this flow improver has been used for the tight sand pressing crack construction, has obtained preferably fracturing effect.
Description of drawings
Fig. 1 is the relation of drag reducing efficiency and flow;
Fig. 2 is certain oil field well hydraulic fracture operating curve;
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
The ratio of 3:1 is dissolved in monomer acrylamide and function monomer MAA (methacrylic acid) in 3% the NaCl aqueous solution in mass ratio, is made into monomer mass concentration and is 33% the aqueous solution, is water;
With tensio-active agent and cyclohexane 2:9 mixed dissolution in mass ratio, add and be equipped with in the four-hole boiling flask of reflux condensing tube, thermometer, agitator, wherein tensio-active agent is that Span-80 and Tween-60 form HLB=8.7 by the mass ratio of 4:3 is composite.Four-hole bottle places 45 ℃ of constant temperature baths, and logical nitrogen also stirred 15～20 minutes, and water is slowly splashed in the four-hole boiling flask, and water oil ratio is 2:3, continues logical nitrogen gas stirring 30 minutes, makes it fully emulsified; In four-hole bottle, slowly drip respectively water soluble starter AIBI and oil-soluble initiator V-65, wherein initiator accounts for 0.25% of monomer acrylamide quality, the mass ratio of water soluble starter AIBI and oil-soluble initiator V-65 is 1:1, continue again reaction 1～2 hour, polyreaction is finished, and namely obtains water-soluble flow improver BC-12.Water soluble starter AIBI and oil-soluble initiator V-65 are Chemicals commonly used.
Effect assessment:
Use the flowing loop friction drag test macro that friction test is fallen in water-soluble flow improver, do contrast with clear water, add water-soluble flow improver in clear water, concentration is 0.05%.Select the pipeline of 6mm to test, record calculates drag reducing efficiency by the frictional resistance pressure drop behind the pipeline, estimates the drag-reduction effect of water-soluble flow improver according to the size of drag reducing efficiency, the relation of drag reducing efficiency and flow such as Fig. 1, and maximum drag reducing efficiency can reach 57%.
Drag reducing efficiency calculates:
In the formula: Φ----drag reducing efficiency, %;
Δ P
Water----the pressure reduction when clear water passes through the test pipeline, MPa;
Pressure reduction when Δ P----containing water-soluble flow improver fluid passes through the test pipeline, MPa.
The rig-site utilization situation:
Certain oil field well belongs to the compact clastic rock reservoir, and reservoir is complicated, and reserves are large, and reservoir conditions is poor, and it is poor that uniformity is oozed in the hole, and clay content is high, variation is large.The reservoir formation temperature is 41 ℃, well section 1028.2-1033.4m, and rate of permeation is 7.85 * 10
-3μ m
2, porosity is 10%, and Compacted rock is the low hole of low hole-Te, special low permeability reservoir, and reservoir conditions is poor.Reservoir distribution is unstable, and the physical property condition changes greatly.This well has adopted the slippery water fracturing technique, the fracturing liquid prescription: 0.1% flow improver BC-12+1% expansion-resisting agent KCl+0.3% cleanup additive DB-80.The total liquid measure 350.7m of whole construction work
3, sand is than 8.76%, parting pressure 24.3MPa, and operation pressure 31.6MPa, termination of pumping pressure 20.8MPa, pressing crack construction is smooth, and the construction frictional resistance is low, has obtained good effect of increasing production, construction curve such as Fig. 2.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (8)
1. the preparation method of a slippery water fracturing liquid flow improver is characterized in that step is as follows:
(1) outfit of water
With monomer acrylamide and function monomer MAA in mass ratio (2～10): 1 mixes, and is dissolved in the NaCl aqueous solution of 3wt%～5wt%, and monomer acrylamide mass concentration is 30%～40%;
(2) outfit of oil phase
With compound surfactant and base oil in mass ratio (2～3): 10 mixed dissolutions form oil phase; Compound surfactant adopts nonionic surface active agent sorbitan (Span-80) and polyoxyethylene sorbitan stearate (Tween-60), and it is 8.0～9.5 that the ratio of adjustment Span-80 and Tween-60 makes the HLB value of system;
(3) conversed phase micro emulsion copolymerization
Oil phase in the step (2) is joined in the reactor, and reactor is placed 30～50 ℃ thermostat water bath, logical nitrogen flooding oxygen 10～20min; Water in the step (1) is placed dropping funnel, slowly splash in the reactor under high-speed stirring, 20～30min dropwises, after continuing to lead to the fully emulsified 30～40min of nitrogen high-speed stirring; Initiator is splashed in the reactor, at the reaction 1～2h of situation about stirring, polyreaction is finished, and obtains required flow improver again.
2. preparation method according to claim 1 is characterized in that, the described aqueous pH values of step (1) is 7～10.
3. preparation method according to claim 1 is characterized in that, the mass ratio of the described tensio-active agent Span-80 of step (2) and Tween-60 is (1.18～2): 1.
4. preparation method according to claim 1 is characterized in that, the described base oil of step (2) is one or more in white oil, kerosene, cyclohexane, the isoparaffin.
5. preparation method according to claim 1 is characterized in that, the described water of step (1) and the described oil phase mass ratio of step (2) are (2～0.9): 1.
6. preparation method according to claim 1 is characterized in that, the described initiator of step (3) is acrylamide derivative and the K of Potassium Persulphate/sodium bisulfite redox initiator, azo-initiator or tertiary amine groups
2S
2O
8In the redox initiator that forms one or more, addition is 0.15%～0.35% of monomer acrylamide weight.
7. preparation method according to claim 1 is characterized in that, the described initiation reaction temperature of step (3) is 35～45 ℃.
8. the slippery water fracturing liquid flow improver of preparation method according to claim 1 preparation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310020401.9A CN103013488B (en) | 2013-01-21 | 2013-01-21 | Slickwater fracturing fluid drag reducer and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310020401.9A CN103013488B (en) | 2013-01-21 | 2013-01-21 | Slickwater fracturing fluid drag reducer and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103013488A true CN103013488A (en) | 2013-04-03 |
| CN103013488B CN103013488B (en) | 2015-05-20 |
Family
ID=47962611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310020401.9A Active CN103013488B (en) | 2013-01-21 | 2013-01-21 | Slickwater fracturing fluid drag reducer and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103013488B (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103254887A (en) * | 2013-06-09 | 2013-08-21 | 郑建立 | Anti-drag aqueous fracturing fluid preparation |
| CN103265940A (en) * | 2013-05-25 | 2013-08-28 | 西南石油大学 | Water base fracture drag reducer |
| CN103627380A (en) * | 2013-11-08 | 2014-03-12 | 中国石油天然气股份有限公司 | Water-soluble drag reducer as well as preparation method and application thereof |
| CN103820099A (en) * | 2014-03-05 | 2014-05-28 | 成都佰椿石油科技有限公司 | Acid liquor friction reducer and preparation method thereof |
| CN103937484A (en) * | 2014-05-09 | 2014-07-23 | 余维初 | Shale gas well slickwater fracturing fluid system high-efficiency emulsion quick water-soluble drag reducer |
| CN104232055A (en) * | 2013-06-13 | 2014-12-24 | 中国石油化工股份有限公司 | Drag reducer for fracturing fluid and preparation method thereof |
| CN104560002A (en) * | 2013-10-28 | 2015-04-29 | 中国石油化工股份有限公司 | Drag reducer for fracturing shale gas and preparation method of drag reducer |
| CN107207953A (en) * | 2014-12-31 | 2017-09-26 | 凯米罗总公司 | Emulsion comprising alkyl ether sulphate and application thereof |
| US10040988B2 (en) | 2015-02-28 | 2018-08-07 | Phoenix C&W, Inc. | High-efficiency milk-like friction reducer with instant dissolution for shale gas slick water fracturing |
| CN109265605A (en) * | 2018-11-26 | 2019-01-25 | 西南石油大学 | A kind of low adsorption salt tolerant friction reducer suitable for shale reservoir fracturing reform |
| CN111255392A (en) * | 2020-03-31 | 2020-06-09 | 中国石油集团渤海钻探工程有限公司 | Coiled tubing sand washing liquid |
| CN111287719A (en) * | 2020-02-17 | 2020-06-16 | 西南石油大学 | Method for adding thickening agent in integrated fracturing construction |
| CN112029491A (en) * | 2020-09-15 | 2020-12-04 | 郑州德融科技有限公司 | Drag reducer for fracturing and production process thereof |
| CN112126421A (en) * | 2020-09-04 | 2020-12-25 | 四川省威沃敦化工有限公司 | Drag reducer for chemical fracturing and preparation method thereof |
| CN114686197A (en) * | 2022-04-13 | 2022-07-01 | 四川川庆井下科技有限公司 | Multifunctional reversed-phase suspension resistance-reducing agent system for shale gas industrial sand-adding fracturing fluid |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102060965A (en) * | 2009-11-11 | 2011-05-18 | 中国科学院理化技术研究所 | Preparation method of partially hydrolyzed polyacrylamide with improved temperature and salt resisting performances |
-
2013
- 2013-01-21 CN CN201310020401.9A patent/CN103013488B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102060965A (en) * | 2009-11-11 | 2011-05-18 | 中国科学院理化技术研究所 | Preparation method of partially hydrolyzed polyacrylamide with improved temperature and salt resisting performances |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103265940A (en) * | 2013-05-25 | 2013-08-28 | 西南石油大学 | Water base fracture drag reducer |
| CN103265940B (en) * | 2013-05-25 | 2014-06-11 | 西南石油大学 | Water base fracture drag reducer |
| CN103254887A (en) * | 2013-06-09 | 2013-08-21 | 郑建立 | Anti-drag aqueous fracturing fluid preparation |
| CN103254887B (en) * | 2013-06-09 | 2015-07-01 | 郑建立 | Anti-drag aqueous fracturing fluid preparation |
| CN104232055B (en) * | 2013-06-13 | 2017-05-31 | 中国石油化工股份有限公司 | A kind of fracturing fluid drag reducer and preparation method thereof |
| CN104232055A (en) * | 2013-06-13 | 2014-12-24 | 中国石油化工股份有限公司 | Drag reducer for fracturing fluid and preparation method thereof |
| CN104560002A (en) * | 2013-10-28 | 2015-04-29 | 中国石油化工股份有限公司 | Drag reducer for fracturing shale gas and preparation method of drag reducer |
| CN104560002B (en) * | 2013-10-28 | 2017-12-15 | 中国石油化工股份有限公司 | Shale gas pressure break drag reducer and preparation method thereof |
| CN103627380A (en) * | 2013-11-08 | 2014-03-12 | 中国石油天然气股份有限公司 | Water-soluble drag reducer as well as preparation method and application thereof |
| CN103627380B (en) * | 2013-11-08 | 2016-06-08 | 中国石油天然气股份有限公司 | A kind of water solublity drag reducer and preparation thereof and application |
| CN103820099A (en) * | 2014-03-05 | 2014-05-28 | 成都佰椿石油科技有限公司 | Acid liquor friction reducer and preparation method thereof |
| CN103937484A (en) * | 2014-05-09 | 2014-07-23 | 余维初 | Shale gas well slickwater fracturing fluid system high-efficiency emulsion quick water-soluble drag reducer |
| CN103937484B (en) * | 2014-05-09 | 2015-06-10 | 余维初 | Shale gas well slickwater fracturing fluid system high-efficiency emulsion quick water-soluble drag reducer |
| CN107207953A (en) * | 2014-12-31 | 2017-09-26 | 凯米罗总公司 | Emulsion comprising alkyl ether sulphate and application thereof |
| US10040988B2 (en) | 2015-02-28 | 2018-08-07 | Phoenix C&W, Inc. | High-efficiency milk-like friction reducer with instant dissolution for shale gas slick water fracturing |
| CN109265605A (en) * | 2018-11-26 | 2019-01-25 | 西南石油大学 | A kind of low adsorption salt tolerant friction reducer suitable for shale reservoir fracturing reform |
| CN109265605B (en) * | 2018-11-26 | 2020-12-04 | 西南石油大学 | Low-adsorption salt-resistant resistance-reducing agent suitable for shale reservoir fracturing transformation |
| CN111287719A (en) * | 2020-02-17 | 2020-06-16 | 西南石油大学 | Method for adding thickening agent in integrated fracturing construction |
| CN111255392A (en) * | 2020-03-31 | 2020-06-09 | 中国石油集团渤海钻探工程有限公司 | Coiled tubing sand washing liquid |
| CN112126421A (en) * | 2020-09-04 | 2020-12-25 | 四川省威沃敦化工有限公司 | Drag reducer for chemical fracturing and preparation method thereof |
| CN112126421B (en) * | 2020-09-04 | 2021-04-30 | 四川省威沃敦化工有限公司 | Drag reducer for chemical fracturing and preparation method thereof |
| CN112029491A (en) * | 2020-09-15 | 2020-12-04 | 郑州德融科技有限公司 | Drag reducer for fracturing and production process thereof |
| CN114686197A (en) * | 2022-04-13 | 2022-07-01 | 四川川庆井下科技有限公司 | Multifunctional reversed-phase suspension resistance-reducing agent system for shale gas industrial sand-adding fracturing fluid |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103013488B (en) | 2015-05-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103013488B (en) | Slickwater fracturing fluid drag reducer and preparation method thereof | |
| CN103627380B (en) | A kind of water solublity drag reducer and preparation thereof and application | |
| CN104448126B (en) | Harsh oil deposit reversed-phase microemulsion profile-control flooding system and preparation method thereof | |
| CN102093880B (en) | Water control agent for oil well and preparation method thereof | |
| Wang et al. | Preparation of microgel nanospheres and their application in EOR | |
| CN103951785B (en) | A kind of fracturing liquid flow improver and its preparation method and application | |
| CN106590614B (en) | Instant salt-resistant high-viscosity resistance reducing agent and preparation method thereof | |
| CN104403656A (en) | Novel zwitterionic slickwater fracturing fluid and preparation method thereof | |
| CN103694984A (en) | Shale gas acid fracturing drag reducer and reparation method thereof | |
| CN108559479A (en) | It is a kind of can On-line construction verse phase microemulsion polymer fracturing fluid system | |
| CN104178102A (en) | Cross-linkable high-temperature-resistant residue-free polybasic copolymerizable fracturing fluid and preparation method thereof | |
| CN101314713A (en) | Controllable-viscosity acid liquor system for carbonatite container horizon acid fracturing | |
| CN105567211A (en) | Shale gas slickwater fracturing fluid and preparation method thereof | |
| CN105238381B (en) | A kind of function composite lotion state polymer fracturing fluid and preparation method thereof | |
| CN103602329B (en) | A kind of pressure break flow improver | |
| CN115612021B (en) | Nano drag reducer for unconventional reservoir hydraulic fracturing and preparation method thereof | |
| CN105504182A (en) | Nanoscale Pickering emulsion type fracturing fluid and preparing method thereof | |
| CN105086982B (en) | Multi-component slickwater drag reducer and preparation method thereof | |
| CN106350053A (en) | Quick-dissolving type seawater-based high-temperature fracturing fluid | |
| CN103937484A (en) | Shale gas well slickwater fracturing fluid system high-efficiency emulsion quick water-soluble drag reducer | |
| CN103254887A (en) | Anti-drag aqueous fracturing fluid preparation | |
| CN104962275A (en) | Fiber-reactive aqueous fracturing fluid for compact reservoir transformation, and use method thereof | |
| CN116410402A (en) | Resistance reducing agent for fracturing and preparation method thereof | |
| CN108690597A (en) | A kind of slippery water fracturing fluid | |
| CN104232055B (en) | A kind of fracturing fluid drag reducer and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Free format text: FORMER OWNER: CHENGDU BAICHUN PETROLEUM TECHNOLOGY CO., LTD. Effective date: 20150525 Owner name: CHENGDU BAICHUN PETROLEUM TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: SOUTHWEST PETROLEUM UNIVERSITY Effective date: 20150525 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20150525 Address after: 610500 science and Technology Park, Southwest Petroleum University, Xindu District, Sichuan, Chengdu 706B Patentee after: CHENGDU BAICHUN PETROLEUM TECHNOLOGY Co.,Ltd. Address before: No. 8 Road, Xindu Xindu District of Chengdu city of Sichuan Province in 610500 Patentee before: Southwest Petroleum University Patentee before: CHENGDU BAICHUN PETROLEUM TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20220831 Address after: 704ab, Science Park building, Southwest Petroleum University, 8 Xindu Avenue, Xindu District, Chengdu, Sichuan 610500 Patentee after: CHENGDU BAICHUN PETROLEUM TECHNOLOGY Co.,Ltd. Patentee after: Sichuan Deyi Datong Oil and Gas Engineering Technology Service Co.,Ltd. Address before: Room 706B, Science and Technology Park, Southwest Petroleum University, Xindu District, Chengdu, Sichuan 610500 Patentee before: CHENGDU BAICHUN PETROLEUM TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right |