CN104481475A - Oil well carbon dioxide carbonated water throughput production increasing method - Google Patents
Oil well carbon dioxide carbonated water throughput production increasing method Download PDFInfo
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- CN104481475A CN104481475A CN201410528792.XA CN201410528792A CN104481475A CN 104481475 A CN104481475 A CN 104481475A CN 201410528792 A CN201410528792 A CN 201410528792A CN 104481475 A CN104481475 A CN 104481475A
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- carbon dioxide
- oil
- well
- oil well
- liquid
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 33
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 230000001965 increasing effect Effects 0.000 title claims abstract description 14
- 239000003129 oil well Substances 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 239000012530 fluid Substances 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 230000002528 anti-freeze Effects 0.000 claims abstract description 6
- 238000005070 sampling Methods 0.000 claims abstract description 6
- 238000010276 construction Methods 0.000 claims abstract description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 27
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 8
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 4
- 235000019270 ammonium chloride Nutrition 0.000 claims description 4
- 239000008398 formation water Substances 0.000 claims description 4
- 239000001103 potassium chloride Substances 0.000 claims description 4
- 235000011164 potassium chloride Nutrition 0.000 claims description 4
- 239000001509 sodium citrate Substances 0.000 claims description 4
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 4
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 3
- 150000002462 imidazolines Chemical class 0.000 claims description 3
- 239000003112 inhibitor Substances 0.000 claims description 3
- 239000012188 paraffin wax Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000004094 surface-active agent Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000002265 prevention Effects 0.000 abstract 1
- 238000005086 pumping Methods 0.000 abstract 1
- 238000002791 soaking Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 20
- 230000000638 stimulation Effects 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 230000035699 permeability Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 210000002615 epidermis Anatomy 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 125000002636 imidazolinyl group Chemical group 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 iron ions Chemical class 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
-
- 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
- C09K8/5045—Compositions based on water or polar solvents containing inorganic 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
-
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
-
- 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
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/32—Anticorrosion additives
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Geochemistry & Mineralogy (AREA)
- Edible Oils And Fats (AREA)
Abstract
The invention provides an oil well carbon dioxide carbonated water throughput production increasing method. The method comprises the following steps of: injecting softening liquid, when a large amount of yellowish liquid is generated at a sampling port, repeatedly sampling at the sampling port of the oil well, detecting the antifreeze content by using a micro-water detector, when the antifreeze content is 20%, stopping a pumping unit to a bottom dead center, closing a wax prevention gate to complete softening liquid construction, injecting 300m3 of prepad liquid fluid, injecting liquid carbon dioxide under the average wellhead injection pressure of about 10MPa, soaking for 20 days and then opening the well for production. According to the application method, a lot of carbon dioxide is allowed to enter the remaining oil in a high level segment, and the carbon dioxide throughput oil recovery is significantly increased.
Description
Technical field:
The present invention relates to technical field of oilfield recovery percent improvement, specifically belong to a kind of oil well carbon dioxide carbonated water and to handle up method for increasing.
Background technology:
CO_2 stimulation is that after a certain amount of carbon dioxide is injected stratum by the oil jacket annular space of oil well, through stewing well after a while, carbon dioxide is fully diffused in oil reservoir, makes viscosity of crude reduction, volume expansion etc., makes crude oil be easy to extraction.But at the scene in process of the test, due to interlayer physical difference, interlayer pressure is different, epidermis interference etc., the carbon dioxide injected can not even air-breathing, the carbon dioxide of such injection can not effectively utilize, most of carbon dioxide injection is good to physical property most probably, formation depletion, the well section that completion condition is good, and in fact the remaining oil of this part interval is limited, substantially idle space is belonged to, be difficult to safeguard measure oil increasing effect, in order to improve the success rate of CO_2 stimulation measure, need before CO_2 stimulation, inject a certain amount of prepad fluid, this prepad fluid can not pollute stratum, the effect of adjustment gas entry profile can be played again, guarantee the even air-breathing of each payzone, improve measure effect, increase oil output per well.
Summary of the invention:
In order to overcome the deficiency that background technology exists, the invention provides a kind of oil well carbon dioxide carbonated water and to handle up method for increasing, application the method makes more carbon dioxide enter into the interval of residue innage, and the oil recovery factor of CO_2 stimulation is significantly improved.
Technical scheme of the present invention is: this oil well carbon dioxide carbonated water method for increasing of handling up comprises the following steps: first will inject bating liquor, when there is weak yellow liquid in a large number in sample tap, repeatedly sample at oil well sampling mouth, utilize microwater device chemical examination antifreeze glycol content wherein, when its content reaches 20%, now oil pumper is stopped to bottom dead centre, close Paraffin Removal gate, bating liquor construction terminates, and next step starts to inject 300m
3after prepad fluid fluid, start to inject liquid carbon dioxide, the average injection pressure of well head remains on about 10MPa, stewing well opening well and making production after 20 days.
In such scheme, bating liquor consists of, by mass percentage: ethylene glycol 50%, carbon dioxide corrosion inhibitor 3%, expansion-resisting agent 5%, scale preventative 2%, surfactant 2% and excess water; Consisting of of prepad fluid, by mass percentage: 2% corrosion inhibiter modified imidazoline, 1% expansion-resisting agent potassium chloride or ammonium chloride solution, 0.5% ferrous stability sodium citrate solution, 10% ethylene glycol, surplus is formation water.
This prepad fluid have nontoxic, do not injure the characteristic such as stratum, low interfacial tension.With formation water preparation, wherein corrosion inhibiter is modified imidazoline, mainly plays the effect preventing carbon dioxide corrosion tube wall; Expansion-resisting agent is potassium chloride or ammonium chloride solution, mainly plays the effect preventing clay swell; Ferrous stability is sodium citrate solution, mainly prevents from forming precipitation of iron ions, and plugging hole is waited, and then reduces the permeability on stratum; Ethylene glycol mainly plays effect that is antifreeze, Xie Shuisuo.
Lead volume consumption V: calculated by adjustment radius a and b, the empirical coefficient Pv that select, oil reservoir degree of porosity φ, core intersection h, V=Pv π ab φ H.The sphere of action of object oil reservoir is regarded Elliptic Cylinder as to calculate (as shown in Figure 1):
V=Pv π ab φ H, wherein:
φ---degree of porosity, %
P
v---empirical coefficient
H---producing well section, m
A, b---treatment radius, m
The present invention has following beneficial effect: the present invention is in order to improve the success rate of CO_2 stimulation measure; before CO_2 stimulation; inject a certain amount of prepad fluid; fully dissolve with the liquid carbon dioxide of follow-up injection, the carbonated water that final formation pH value is lower, this mixed liquor can protect stratum; the effect of adjustment gas entry profile can be played again; guarantee the even air-breathing of each payzone, improve measure effect, increase oil output per well.This carbonated water has function that is nontoxic, that do not injure stratum, can play lasting adjustment gas entry profile.
Accompanying drawing illustrates:
Accompanying drawing 1 is the schematic diagram that the present invention calculates lead volume consumption.
Detailed description of the invention:
Below in conjunction with embodiment, the invention will be further described:
Now carry out carbon dioxide carbonated water to Bei28 oil well to handle up volume increase: first will inject bating liquor, bating liquor injects with peak discharge, when there is weak yellow liquid in a large number in sample tap, repeatedly sample at oil well sampling mouth, utilize microwater device chemical examination antifreeze glycol content wherein, when its content reaches 20%, now oil pumper is stopped to bottom dead centre, close Paraffin Removal gate, bating liquor construction terminates, and next step starts to inject 300m
3after prepad fluid fluid, start to inject liquid carbon dioxide, the average injection pressure of well head remains on about 10MPa, stewing well opening well and making production after 20 days.The carbon dioxide of prepad fluid and follow-up injection fully dissolves rear opening well and making production, on average increase day by day oil 3.2 tons, accumulative increasing oil 280 tons, CO_2 stimulation oil increasing effect is obvious, and this adds prepad fluid adjustment gas entry profile to improve the experiment well of CO_2 stimulation success rate.
In above-mentioned experiment, bating liquor consists of, by mass percentage: ethylene glycol 50%, carbon dioxide corrosion inhibitor 3%, expansion-resisting agent 5%, scale preventative 2%, surfactant 2% and excess water; Consisting of of prepad fluid, by mass percentage: 2% corrosion inhibiter modified imidazoline, 1% expansion-resisting agent potassium chloride or ammonium chloride solution, 0.5% ferrous stability sodium citrate solution, 10% ethylene glycol, surplus is formation water.
Handle up in process in above-mentioned experiment, after prepad fluid injects oil reservoir, when follow-up carbon dioxide enters oil reservoir, the mixed liquor that final formation pH value is lower.In porous media, viscosity and the pore size of mixed liquor are proportional, the barometric gradient promoted needed for mixed liquor is large at high permeability zones, in hyposmosis, district is little, therefore can single produced " tonguing " and " has channeling " passage of handling up of shutoff effectively, effectively overcome the problems such as fingering common in non-homogeneous pay and gravitational differentiation.Because interval permeability exists very big-difference, the mixed liquor first injected enters the interval that physical property is good, permeability is high more.When carbon dioxide injection, mixed liquor has occupied a large amount of macrovoids, the carbon dioxide of follow-up injection enters the amount that height oozes rock stratum section to be reduced relatively, and more carbon dioxide is entered physical property is poor, permeability is lower interval, so more carbon dioxide enters into the interval of residue innage, and the oil recovery factor of CO_2 stimulation is significantly improved.
The carbon dioxide of prepad fluid and follow-up injection fully dissolves rear opening well and making production, and on average increase day by day oil 3.2 tons, and accumulative increasing oil 280 tons, CO_2 stimulation oil increasing effect is obvious.
Claims (2)
1. an oil well carbon dioxide carbonated water is handled up method for increasing, comprise the following steps: first will inject bating liquor, when there is weak yellow liquid in a large number in sample tap, repeatedly sample at oil well sampling mouth, utilize microwater device chemical examination antifreeze glycol content wherein, when its content reaches 20%, now oil pumper is stopped to bottom dead centre, close Paraffin Removal gate, bating liquor construction terminates, and next step starts to inject 300m
3after prepad fluid fluid, start to inject liquid carbon dioxide, the average injection pressure of well head remains on about 10MPa, stewing well opening well and making production after 20 days.
2. oil well carbon dioxide carbonated water according to claim 1 is handled up method for increasing, it is characterized in that: bating liquor consists of, by mass percentage: ethylene glycol 50%, carbon dioxide corrosion inhibitor 3%, expansion-resisting agent 5%, scale preventative 2%, surfactant 2% and excess water; Consisting of of prepad fluid, by mass percentage: 2% corrosion inhibiter modified imidazoline, 1% expansion-resisting agent potassium chloride or ammonium chloride solution, 0.5% ferrous stability sodium citrate solution, 10% ethylene glycol, surplus is formation water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410528792.XA CN104481475B (en) | 2014-10-10 | 2014-10-10 | Oil well carbon dioxide carbonated water is handled up method for increasing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410528792.XA CN104481475B (en) | 2014-10-10 | 2014-10-10 | Oil well carbon dioxide carbonated water is handled up method for increasing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104481475A true CN104481475A (en) | 2015-04-01 |
| CN104481475B CN104481475B (en) | 2016-11-09 |
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Family Applications (1)
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|---|---|---|---|
| CN201410528792.XA Active CN104481475B (en) | 2014-10-10 | 2014-10-10 | Oil well carbon dioxide carbonated water is handled up method for increasing |
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| CN (1) | CN104481475B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106812509A (en) * | 2015-11-30 | 2017-06-09 | 中国石油天然气股份有限公司 | Oil extraction method for assisting carbon dioxide huff and puff by polymer-surfactant binary oil displacement system |
| CN109138944A (en) * | 2018-09-11 | 2019-01-04 | 大庆金军石油科技开发有限公司 | A kind of carbon dioxide compound throughput new method |
| CN110886597A (en) * | 2019-12-31 | 2020-03-17 | 清华大学 | Nano-fluid assisted carbon dioxide huff and puff oil production method |
| CN111022006A (en) * | 2019-12-06 | 2020-04-17 | 大庆金军石油科技开发有限公司 | Method for improving shale oil well recovery ratio through carbon dioxide composite huff and puff |
| CN115851244A (en) * | 2022-11-17 | 2023-03-28 | 中国石油天然气集团有限公司 | Anti-freezing material for equipment for winter fracturing construction, and preparation method and use method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4250965A (en) * | 1979-03-16 | 1981-02-17 | Wiseman Jr Ben W | Well treating method |
| CN102040992A (en) * | 2010-11-16 | 2011-05-04 | 赵金树 | Rod blockage prevention liquid for carbon dioxide huff-puff enhanced oil recovery and injection method thereof |
| CN102587873A (en) * | 2011-12-01 | 2012-07-18 | 中国石油天然气股份有限公司 | Carbon dioxide huff-puff water-control oil-increasing method for horizontal well |
| CN103422838A (en) * | 2013-08-28 | 2013-12-04 | 赵金树 | Carbon dioxide huff and puff enhanced oil production method |
-
2014
- 2014-10-10 CN CN201410528792.XA patent/CN104481475B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4250965A (en) * | 1979-03-16 | 1981-02-17 | Wiseman Jr Ben W | Well treating method |
| CN102040992A (en) * | 2010-11-16 | 2011-05-04 | 赵金树 | Rod blockage prevention liquid for carbon dioxide huff-puff enhanced oil recovery and injection method thereof |
| CN102587873A (en) * | 2011-12-01 | 2012-07-18 | 中国石油天然气股份有限公司 | Carbon dioxide huff-puff water-control oil-increasing method for horizontal well |
| CN103422838A (en) * | 2013-08-28 | 2013-12-04 | 赵金树 | Carbon dioxide huff and puff enhanced oil production method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106812509A (en) * | 2015-11-30 | 2017-06-09 | 中国石油天然气股份有限公司 | Oil extraction method for assisting carbon dioxide huff and puff by polymer-surfactant binary oil displacement system |
| CN109138944A (en) * | 2018-09-11 | 2019-01-04 | 大庆金军石油科技开发有限公司 | A kind of carbon dioxide compound throughput new method |
| CN111022006A (en) * | 2019-12-06 | 2020-04-17 | 大庆金军石油科技开发有限公司 | Method for improving shale oil well recovery ratio through carbon dioxide composite huff and puff |
| CN110886597A (en) * | 2019-12-31 | 2020-03-17 | 清华大学 | Nano-fluid assisted carbon dioxide huff and puff oil production method |
| CN110886597B (en) * | 2019-12-31 | 2021-01-26 | 清华大学 | Nano-fluid assisted carbon dioxide huff and puff oil production method |
| US11401456B2 (en) | 2019-12-31 | 2022-08-02 | Tsinghua University | Enhanced oil recovery method by nanofluid-assisted CO2 huff-n-puff |
| CN115851244A (en) * | 2022-11-17 | 2023-03-28 | 中国石油天然气集团有限公司 | Anti-freezing material for equipment for winter fracturing construction, and preparation method and use method thereof |
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| CN104481475B (en) | 2016-11-09 |
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Effective date of registration: 20151204 Address after: 303, B-10, room 4-8, service outsourcing industry park, 163000 Xinfeng Road, hi tech Zone, Heilongjiang, Daqing Applicant after: DAQING JINJUN PETROLEUM TECHNOLOGY DEVELOPMENT CO., LTD. Address before: No. 4-12, Gaoping District, Datong song Road, Datong District, Heilongjiang, Daqing Applicant before: Zhao Jinshu |
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