CN104629712A - Deep acidizing acid liquid and method for realizing deep acidizing of low-permeability sandstone reservoir - Google Patents
Deep acidizing acid liquid and method for realizing deep acidizing of low-permeability sandstone reservoir Download PDFInfo
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- CN104629712A CN104629712A CN201310573747.1A CN201310573747A CN104629712A CN 104629712 A CN104629712 A CN 104629712A CN 201310573747 A CN201310573747 A CN 201310573747A CN 104629712 A CN104629712 A CN 104629712A
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- 239000002253 acid Substances 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000007788 liquid Substances 0.000 title claims abstract description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000654 additive Substances 0.000 claims abstract description 16
- 230000000996 additive effect Effects 0.000 claims abstract description 16
- 239000003381 stabilizer Substances 0.000 claims abstract description 16
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 15
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 12
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000002360 preparation method Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 7
- 150000003839 salts Chemical class 0.000 claims abstract description 6
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000004927 clay Substances 0.000 claims abstract description 5
- 235000019253 formic acid Nutrition 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims description 91
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 230000035699 permeability Effects 0.000 claims description 8
- 230000009466 transformation Effects 0.000 claims description 8
- 239000013543 active substance Substances 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract 2
- 230000007797 corrosion Effects 0.000 abstract 2
- 239000003112 inhibitor Substances 0.000 abstract 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract 2
- 229910052742 iron Inorganic materials 0.000 abstract 2
- 238000010992 reflux Methods 0.000 abstract 2
- 230000020477 pH reduction Effects 0.000 abstract 1
- 239000004094 surface-active agent Substances 0.000 abstract 1
- 239000002562 thickening agent Substances 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000009096 changqing Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000011426 transformation method Methods 0.000 description 1
Classifications
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- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
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- 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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
-
- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- 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
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- 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
A deep acidizing acid liquid and a method for realizing deep acidizing of a low-permeability sandstone reservoir belong to the technical field of oil exploitation. Preparing acid liquor a: adding hydrochloric acid, formic acid and acetic acid into an acid tank, controlling the discharge capacity of a liquid preparation vehicle to be 300L/min, and adding a corrosion inhibitor and an iron ion stabilizer into the acid tank, wherein the discharge capacity of the refluxing acid liquid is based on the standard that a funnel does not overflow; adding a clay stabilizer and a discharge aiding agent, and circulating for 30 minutes; preparing acid liquor b: adding hydrochloric acid and hydrofluoric acid into an acid tank, controlling the discharge capacity of a liquid preparation vehicle to be 300L/min, and adding a corrosion inhibitor and an iron ion stabilizer into the acid tank, wherein the discharge capacity of the refluxing acid liquid is based on the standard that a funnel does not overflow; then slowly adding CJ1-6 thickening agent (the adding time is controlled to be 2.5min every 100 kg); adding salt, surfactant and cleanup additive, and circulating for 30 minutes; deep acidification process.
Description
Technical field
The present invention relates to a kind of deep acidizing acid solution and realize low permeability sandstone reservoir deep acidizing method, belonging to technical field of petroleum extraction.
Background technology
In recent years oil-field development runs into and there is nothing every interlayer, and core intersection is thin, and end water grows class reservoir.For this kind of reservoir, adopt the mode of pressure break to link up water layer, directly cause bottom water coning, oil well produces water; Adopt conventional acidulation technology to there is operating distance short, the problem that correctional effect is undesirable, therefore must consider other well stimulation.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of deep acidizing acid solution and realizing low permeability sandstone reservoir deep acidizing method.
The present invention propose a kind of realize low permeability sandstone reservoir deep acidizing transformation method and a kind of deep acidizing acid formula, be applied to Changqing oilfields low permeability sandstone reservoir acidifying transformation.The method first uses conventional acid solution process immediate vicinity of wellbore to pollute, and then uses deep acidizing acid solution process stratum.This acid formula can keep H+ concentration for a long time, reaches the object on deep acidizing stratum.
The invention provides a kind of method of acid solution of deep acidizing and the transformation of a kind of deep acidizing, dissolve away calcium ion by conventional acid lyolysis except the pollution of immediate vicinity of wellbore, and then reduce the consumption of main acid in immediate vicinity of wellbore and prevent the precipitation of Calcium Fluoride (Fluorspan); By using the deep acidizing acid formula of research and development, making main acid H+ concentration keep higher level, and being adjusted by acid solution consumption, further improving the Reservoir Acidization degree of depth, to improve reservoir oil flow channel; Finally by with conventional acid solution cleaning pit shaft, make the further acidifying of immediate vicinity of wellbore reservoir.
The technical solution used in the present invention is: by the alter least-squares of conventional acid solution and deep acidizing acid solution, improves acidizing radius, reduces the injury of conventional acidulation product formation.
The raw material of a kind of method of acid solution of deep acidizing and the transformation of a kind of deep acidizing comprises:
1, hydrochloric acid: the brilliant pure reagent company limited in Shanghai produces;
2, hydrofluoric acid, the brilliant pure reagent company limited in Shanghai;
3, inhibiter, Chang Qing down-hole, Qingyang oilfield additive company;
4, cleanup additive, Chang Qing down-hole, Qingyang oilfield additive company;
5, Fe stabilizer, Chang Qing down-hole, Qingyang oilfield additive company;
6, tensio-active agent, Chang Qing down-hole, Qingyang oilfield additive company;
7, salt, Chang Qing down-hole, Qingyang oilfield additive company;
8, CJ1-6, Chang Qing down-hole, Qingyang oilfield additive company;
9, water.
The each weight percentages of components of method of a kind of acid solution of deep acidizing and the transformation of a kind of deep acidizing is:
The each weight percentages of components of acid solution a is:
1, hydrochloric acid, 10%;
2, formic acid, 2%;
3, acetic acid, 6%;
4, inhibiter, 1%;
5, cleanup additive, 0.5%;
6, clay stabilizer, 0.5%;
7, Fe stabilizer, 0.1%;
8, clear water.
The each weight percentages of components of acid solution b is
1, hydrochloric acid, 10%;
2, hydrofluoric acid, 2%;
3, inhibiter, 1.5%;
4, cleanup additive, 0.5%;
5, Fe stabilizer, 0.1%;
6、CJ1-6，0.1%；
7, tensio-active agent, 4%;
8, salt, 0.2%;
9, clear water.
The method preparation method of a kind of acid solution of deep acidizing and the transformation of a kind of deep acidizing:
In sour tank, add hydrochloric acid, formic acid, acetic acid, controlling liquid distributing vehicle discharge capacity is 300L/min, and backflow acid solution displacement size is not excessive for standard with funnel, adds inhibiter, Fe stabilizer in sour tank; Add clay stabilizer, cleanup additive, circulate 30 minutes.Make acid solution a.
In sour tank, add hydrochloric acid, hydrofluoric acid, controlling liquid distributing vehicle discharge capacity is 300L/min, and backflow acid solution displacement size is not excessive for standard with funnel, adds inhibiter, Fe stabilizer in sour tank; Then CJ1-6 viscosifying agent is slowly added (controlling every 100kg joining day is 2.5min); Add salt, tensio-active agent, cleanup additive, circulate 30 minutes.Make acid solution b.
The method technological process of a kind of acid solution of deep acidizing and the transformation of a kind of deep acidizing:
Active water low for → acid solution a low for → close sleeve gate → acid solution a acidifying → acid solution b acidifying → acid solution a acidifying → active water replacement → closing well, open flow.This deep acidizing process is substantially identical with existing acidization, and difference is that two kinds of acid solutions carry out twice alter least-squares.
The first step: active water is low to be replaced: start pump, inject active water 5-10 side by oil pipe, replace out original liquid in pit shaft with active water and fill pit shaft, discharge capacity is at 0.4m
3/ min;
Second step: acid solution a is low to be replaced: replaced into acid solution a flow line volume by oil pipe, discharge capacity is at 0.4m
3/ min;
3rd step: close sleeve gate: make acid solution a start to enter stratum by the method for closing sleeve gate;
4th step: acid solution a acidifying: control discharge capacity be no more than the condition of this area's reservoir fracture pressure at control oil pipe pressure under, be not more than 0.8m
3/ min, accumulative and second step injects acid solution a5-7m altogether
3;
5th step: acid solution b acidifying: acid solution a is changed to acid solution b when aforementioned condition is constant, acid solution b injection rate is at 20-30m
3;
6th step: acid solution a acidifying: acid solution b is changed to acid solution a when aforementioned condition is constant, acid solution a injection rate is at 3-5m
3;
7th step: active water replaces: when aforementioned condition is constant, acid solution a is changed to active water, active water injection rate is a flow line volume;
8th step: closing well, open flow: closing well reaction is after 1-2 hour, and drive a well open flow.
Advantage of the present invention to extend acid solution operating distance in the earth formation, significantly improves acidizing radius, and then improve per-well production.
Embodiment
Obviously, the many modifications and variations that those skilled in the art do based on aim of the present invention belong to protection scope of the present invention.
Embodiment 1:
A kind of deep acidizing acid solution and realize low permeability sandstone reservoir deep acidizing method, relating to oil well acidation technology, is a kind of method adopting deep acidizing acid solution to transform for low permeability sandstone reservoir deep acidizing.
A method for the acid solution of deep acidizing and the transformation of a kind of deep acidizing, described method comprises:
The preparation of A, acid solution:
Prepare container, configure conventional acid solution a and deep acidizing acid solution b as requested;
B, deep acidizing technological process:
Active water low for → acid solution a low for → close sleeve gate → acid solution a acidifying → acid solution b acidifying → acid solution a acidifying → active water replacement → closing well, open flow.
The first step: active water is low to be replaced: start pump, inject active water 5-10 side by oil pipe, replace out original liquid in pit shaft with active water and fill pit shaft, discharge capacity is at 0.4m
3/ min;
Second step: acid solution a is low to be replaced: replaced into acid solution a flow line volume by oil pipe, discharge capacity is at 0.4m
3/ min;
3rd step: close sleeve gate: make acid solution a start to enter stratum by the method for closing sleeve gate;
4th step: acid solution a acidifying: control discharge capacity be no more than the condition of this area's reservoir fracture pressure at control oil pipe pressure under, be not more than 0.8m
3/ min, accumulative and second step injects acid solution a5-7m altogether
3;
5th step: acid solution b acidifying: acid solution a is changed to acid solution b when aforementioned condition is constant, acid solution b injection rate is at 20-30m
3;
6th step: acid solution a acidifying: acid solution b is changed to acid solution a when aforementioned condition is constant, acid solution a injection rate is at 3-5m
3;
7th step: active water replaces: when aforementioned condition is constant, acid solution a is changed to active water, active water injection rate is a flow line volume;
8th step: closing well, open flow: closing well reaction is after 1-2 hour, and drive a well open flow.
As mentioned above, embodiments of the invention are explained, but as long as do not depart from inventive point of the present invention in fact and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, such variation is also all included within protection scope of the present invention.
Claims (2)
1. a deep acidizing acid solution, is characterized in that each weight percentages of components:
The each weight percentages of components of acid solution a:
Hydrochloric acid, 10%;
Formic acid, 2%;
Acetic acid, 6%;
Inhibiter, 1%;
Cleanup additive, 0.5%;
Clay stabilizer, 0.5%;
Fe stabilizer, 0.1%;
All the other are clear water;
The each weight percentages of components of deep acidizing acid solution b:
Hydrochloric acid, 10%;
Hydrofluoric acid, 2%;
Inhibiter, 1.5%;
Cleanup additive, 0.5%;
Fe stabilizer, 0.1%;
CJ1-6，0.1%；
Tensio-active agent, 4%;
Salt, 0.2%;
All the other are clear water.
2. realize a method for low permeability sandstone reservoir deep acidizing transformation, it is characterized in that:
The preparation of A, acid solution:
The preparation of acid solution a: add hydrochloric acid, formic acid, acetic acid in sour tank, controlling liquid distributing vehicle discharge capacity is 300L/min, and backflow acid solution displacement size is not excessive for standard with funnel, adds inhibiter, Fe stabilizer in sour tank; Add clay stabilizer, cleanup additive, circulate 30 minutes;
The preparation of acid solution b: add hydrochloric acid, hydrofluoric acid in sour tank, controlling liquid distributing vehicle discharge capacity is 300L/min, and backflow acid solution displacement size is not excessive for standard with funnel, adds inhibiter, Fe stabilizer in sour tank; Then CJ1-6 viscosifying agent is slowly added (controlling every 100kg joining day is 2.5min); Add salt, tensio-active agent, cleanup additive, circulate 30 minutes;
B, deep acidizing technological process:
Active water low for → acid solution a low for → close sleeve gate → acid solution a acidifying → acid solution b acidifying → acid solution a acidifying → active water replacement → closing well, open flow;
The first step: active water is low to be replaced: start pump, inject active water 5-10 side by oil pipe, replace out original liquid in pit shaft with active water and fill pit shaft, discharge capacity is at 0.4m
3/ min;
Second step: acid solution a is low to be replaced: replaced into acid solution a flow line volume by oil pipe, discharge capacity is at 0.4m
3/ min;
3rd step: close sleeve gate: make acid solution a start to enter stratum by the method for closing sleeve gate;
4th step: acid solution a acidifying: control discharge capacity be no more than the condition of this area's reservoir fracture pressure at control oil pipe pressure under, be not more than 0.8m
3/ min, accumulative and second step injects acid solution a5-7m altogether
3;
5th step: acid solution b acidifying: acid solution a is changed to acid solution b when aforementioned condition is constant, acid solution b injection rate is at 20-30m
3;
6th step: acid solution a acidifying: acid solution b is changed to acid solution a when aforementioned condition is constant, acid solution a injection rate is at 3-5m
3;
7th step: active water replaces: when aforementioned condition is constant, acid solution a is changed to active water, active water injection rate is a flow line volume;
8th step: closing well, open flow: closing well reaction is after 1-2 hour, and drive a well open flow.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310573747.1A CN104629712B (en) | 2013-11-15 | 2013-11-15 | Deep acidizing acid liquid and method for realizing deep acidizing of low-permeability sandstone reservoir |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310573747.1A CN104629712B (en) | 2013-11-15 | 2013-11-15 | Deep acidizing acid liquid and method for realizing deep acidizing of low-permeability sandstone reservoir |
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| Publication Number | Publication Date |
|---|---|
| CN104629712A true CN104629712A (en) | 2015-05-20 |
| CN104629712B CN104629712B (en) | 2018-03-09 |
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|---|---|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105735962A (en) * | 2016-01-30 | 2016-07-06 | 山东省鲁南地质工程勘察院 | Paleozoic carbonate heat storage reservoir chemical fracturing well flushing technique |
| CN107987816A (en) * | 2017-11-27 | 2018-05-04 | 延长油田股份有限公司 | A kind of layer dredge method and selective acidizing additive |
| CN108547607A (en) * | 2018-03-07 | 2018-09-18 | 陕西友邦石油工程技术有限公司 | A kind of broadband for low-permeability oilfield stripper well is acidified seam method |
| CN110529091A (en) * | 2019-08-21 | 2019-12-03 | 中国石油天然气股份有限公司 | Horizontal well fixed-point acidizing method and application |
| CN114607345A (en) * | 2022-03-08 | 2022-06-10 | 中海油能源发展股份有限公司 | Process method for expanding acidizing radius of offshore oil field sandstone reservoir |
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| CN102828734A (en) * | 2012-09-13 | 2012-12-19 | 西南石油大学 | Offshore oilfield water injection well online one-step-process acidification technology |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105735962A (en) * | 2016-01-30 | 2016-07-06 | 山东省鲁南地质工程勘察院 | Paleozoic carbonate heat storage reservoir chemical fracturing well flushing technique |
| CN107987816A (en) * | 2017-11-27 | 2018-05-04 | 延长油田股份有限公司 | A kind of layer dredge method and selective acidizing additive |
| CN108547607A (en) * | 2018-03-07 | 2018-09-18 | 陕西友邦石油工程技术有限公司 | A kind of broadband for low-permeability oilfield stripper well is acidified seam method |
| CN110529091A (en) * | 2019-08-21 | 2019-12-03 | 中国石油天然气股份有限公司 | Horizontal well fixed-point acidizing method and application |
| CN114607345A (en) * | 2022-03-08 | 2022-06-10 | 中海油能源发展股份有限公司 | Process method for expanding acidizing radius of offshore oil field sandstone reservoir |
| CN114607345B (en) * | 2022-03-08 | 2023-10-31 | 中海油能源发展股份有限公司 | Technological method for expanding acidizing radius of offshore oilfield sandstone reservoir |
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| CN104629712B (en) | 2018-03-09 |
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