CN105482802B - Online acidizing acid liquid injection system for water injection well and preparation method of online acidizing acid liquid injection system - Google Patents
Online acidizing acid liquid injection system for water injection well and preparation method of online acidizing acid liquid injection system Download PDFInfo
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- CN105482802B CN105482802B CN201510959481.3A CN201510959481A CN105482802B CN 105482802 B CN105482802 B CN 105482802B CN 201510959481 A CN201510959481 A CN 201510959481A CN 105482802 B CN105482802 B CN 105482802B
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- ammonium fluoride
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- 238000002347 injection Methods 0.000 title claims abstract description 36
- 239000007924 injection Substances 0.000 title claims abstract description 36
- 239000002253 acid Substances 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims description 10
- 239000007788 liquid Substances 0.000 title abstract description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 48
- 230000007797 corrosion Effects 0.000 claims abstract description 29
- 238000005260 corrosion Methods 0.000 claims abstract description 29
- 239000002738 chelating agent Substances 0.000 claims abstract description 27
- DDFHBQSCUXNBSA-UHFFFAOYSA-N 5-(5-carboxythiophen-2-yl)thiophene-2-carboxylic acid Chemical compound S1C(C(=O)O)=CC=C1C1=CC=C(C(O)=O)S1 DDFHBQSCUXNBSA-UHFFFAOYSA-N 0.000 claims abstract description 19
- 230000020477 pH reduction Effects 0.000 claims abstract description 16
- 239000012530 fluid Substances 0.000 claims description 40
- 239000007864 aqueous solution Substances 0.000 claims description 10
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 claims description 8
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical group OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 8
- 229960001484 edetic acid Drugs 0.000 claims description 7
- -1 mercaptan amine Chemical class 0.000 claims description 7
- MGFYIUFZLHCRTH-UHFFFAOYSA-N nitrilotriacetic acid Chemical compound OC(=O)CN(CC(O)=O)CC(O)=O MGFYIUFZLHCRTH-UHFFFAOYSA-N 0.000 claims description 7
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical group OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 4
- 239000012964 benzotriazole Substances 0.000 claims description 4
- 239000011505 plaster Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 23
- 239000000084 colloidal system Substances 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 12
- 239000011435 rock Substances 0.000 abstract description 12
- 229910021645 metal ion Inorganic materials 0.000 abstract description 9
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 8
- 239000002734 clay mineral Substances 0.000 abstract description 8
- 239000002244 precipitate Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 239000010426 asphalt Substances 0.000 abstract 1
- 239000013522 chelant Substances 0.000 abstract 1
- 239000003112 inhibitor Substances 0.000 abstract 1
- 238000000151 deposition Methods 0.000 description 12
- 230000008021 deposition Effects 0.000 description 12
- 239000011295 pitch Substances 0.000 description 12
- 239000000243 solution Substances 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000009096 changqing Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 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
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- General 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)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention provides an on-line injection acidizing acid system for a water injection well, wherein hydrochloric acid accounts for 5.0-20.0%; 5.0% -15.0% of ammonium fluoride; 2.0-10.0% of corrosion inhibitor; 3.0% -15.0% of chelating agent; the rest is water. The acid liquor system can effectively erode the clay mineral of the reservoir, carbonate rock and corresponding organic scales such as inorganic scale, colloid, asphalt and the like, and the chelating agent can efficiently chelate Ca2+、Mg2+、Fe3+And metal ions are used for avoiding forming secondary or tertiary precipitates, and one liquid replaces three steps of operation of a pre-liquid, a treatment liquid and a post-liquid of conventional acidification, so that the acidification construction process is simplified, the construction time and cost are saved, the safety risk and labor intensity are reduced, and the construction effect is improved.
Description
Technical field
The present invention relates to a kind of water injection well online injections to be acidified acid fluid system and preparation method thereof, belongs to oil-gas field development skill
Art field.
Technical background
Acidizing Technology is one of current widely used well production increment measure, can effectively release and be drilled well and production process
Injury caused by middle reservoir, improves oil and gas production.Conventional acidulation is to inject certain type, concentration to reservoir according to certain sequence
The formula acid solution of acid solution and additive composition, the tamper in corrosion formation rock part mineral or hole, crack improve ground
Layer or crack penetration improve seepage flow condition, achieve the purpose that recovery or improve Oil ＆ Gas Productivity.
Now widely used acid fluid system is mainly the compounding of hydrochloric acid, mud acid, hydrofluoric acid etc. and additive, these acid solutions
Though system is carried out and implemented for a long time, certain achievement is achieved.Conventional acidulation construction operation is required according to live practice of construction, existing
Required acid solution is prepared in field, the operational procedures such as prepad fluid, treatment fluid, after pad is then carried out, since complicated construction technique, scene are applied
Work condition is limited, and equipment conveying is of high cost, and labor intensity is big.It is tired with liquid with scene that the present invention considers site construction technology flow
The problems such as difficult, has studied a set of new type of continuous injection acidification acid fluid system, which can directly dilute use, and have simultaneously
Standby three prepad fluid, treatment fluid, after pad functions, one step of three step process are completed.
Invention content
Complicated the purpose of the present invention is being directed to live acidizing treatment technological process, equipment operation energy consumption is big, and safety is hidden
Suffer from the problems such as high, develops a kind of water injection well online injection acidification acid fluid system and preparation method thereof, which can be according to existing
Field construction requirement directly dilutes use, and prepad fluid, treatment fluid, three step construction operation of after pad are completed in energy single step, and effectively simplification is applied
Work technique.
The technical solution adopted by the present invention is：
A kind of water injection well online injection acidification acid fluid system, component is as follows by mass percentage：
Hydrochloric acid 5.0% ~ 20.0%；
Ammonium fluoride 5.0% ~ 15.0%；
Corrosion inhibiter 2.0 ~ 10.0%；
Chelating agent 3.0% ~ 15.0%；
Remaining group is divided into water.
The chelating agent is ethylenediamine tetra-acetic acid, complexon I by 2:1 be configured to mass percent concentration be 25.0%
Aqueous solution.
The corrosion inhibiter be triethanolamine, mercaptan amine,Benzotriazole1 is pressed with ethylene glycol dimethyl ether:1:1:1 is configured to
The aqueous solution that mass percent concentration is 20.0%.
The molecular weight of the chelating agent ethylenediamine tetra-acetic acid and complexon I is respectively 292 and 191.
A kind of preparation method of water injection well online injection acidification acid fluid system, the specific steps are：
Plastic beaker one is taken, the water of formula ratio is added, hydrochloric acid, the ammonium fluoride of formula ratio is sequentially added, is stirred with sticking plaster
After mixing uniformly, sequentially add corrosion inhibiter, the chelating agent of formula ratio, make hydrochloric acid, ammonium fluoride, corrosion inhibiter, chelating agent ratio be
5.0%~20.0%：5.0%~15.0%：2.0~10.0%：3.0% ~ 15.0%, after being sufficiently stirred.
Beneficial effects of the present invention are：
Compared with acid solution used in conventional acidulation measure, the acid fluid system is while effective corrosion rock fracture, to current
Conventional three-stage（Prepad fluid, treatment fluid, after pad）Acid
Change construction technology to be improved, acid dilution to required concentration is directly injected into stratum.
The technique need not remove water injection string, simplify construction technology, save the construction time, reduce security risk and labor
Fatigue resistance improves construction effect.
Specific implementation mode
Embodiment 1：
Complicated the purpose of the present invention is being directed to live acidizing treatment technological process, equipment operation energy consumption is big, and safety is hidden
Suffer from the problems such as high, develops a kind of water injection well online injection acidification acid fluid system and preparation method thereof, which can be according to existing
Field construction requirement directly dilutes use, and prepad fluid, treatment fluid, three step construction operation of after pad are completed in energy single step, and effectively simplification is applied
Work technique.
A kind of water injection well online injection acidification acid fluid system, component is as follows by mass percentage：
Hydrochloric acid 5.0%；
Ammonium fluoride 5.0%%；
Corrosion inhibiter 2.0%；
Chelating agent 3.0%；
Remaining group is divided into water.
Hydrochloric acid：Effective corrosion Clay Mineral, the organic depositions such as carbonate rock and corresponding inorganic scale, colloid, pitch；
Ammonium fluoride：It is reacted with hydrochloric acid and generates HF, improve the solution ration to organic depositions such as inorganic scale, colloid, pitches；
Corrosion inhibiter：Metal pipe line is protected not to be corroded；
Chelating agent：Highly effective chelating Ca2+、Mg2+、Fe3+Equal metal ions, avoid the formation of secondary or precipitate three times.
The acid fluid system can effective corrosion Clay Mineral, carbonate rock and corresponding inorganic scale, colloid, pitch etc.
Organic deposition, chelating agent energy highly effective chelating Ca2+、Mg2+、Fe3+Equal metal ions, avoid the formation of secondary or precipitate three times, a kind of liquid
Substitute the prepad fluid of conventional acidulation, treatment fluid and the work of three step of after pad, simplify acidizing treatment technique, save the construction time and at
This, reduces security risk and labor intensity, improves construction effect
Embodiment 2：
A kind of water injection well online injection acidification acid fluid system, component is as follows by mass percentage：
Hydrochloric acid 120.0%；
Ammonium fluoride 10.0%；
Corrosion inhibiter 6.0%；
Chelating agent 9.0%；
Remaining group is divided into water.
Hydrochloric acid：Effective corrosion Clay Mineral, the organic depositions such as carbonate rock and corresponding inorganic scale, colloid, pitch；
Ammonium fluoride：It is reacted with hydrochloric acid and generates HF, improve the solution ration to organic depositions such as inorganic scale, colloid, pitches；
Corrosion inhibiter：Metal pipe line is protected not to be corroded；
Chelating agent：Highly effective chelating Ca2+、Mg2+、Fe3+Equal metal ions, avoid the formation of secondary or precipitate three times.
The acid fluid system can effective corrosion Clay Mineral, carbonate rock and corresponding inorganic scale, colloid, pitch etc.
Organic deposition, chelating agent energy highly effective chelating Ca2+、Mg2+、Fe3+Equal metal ions, avoid the formation of secondary or precipitate three times, a kind of liquid
Substitute the prepad fluid of conventional acidulation, treatment fluid and the work of three step of after pad, simplify acidizing treatment technique, save the construction time and at
This, reduces security risk and labor intensity, improves construction effect
Embodiment 3：
A kind of water injection well online injection acidification acid fluid system, component is as follows by mass percentage：
Hydrochloric acid 20.0%；
Ammonium fluoride 15.0%；
Corrosion inhibiter 10.0%；
Chelating agent 15.0%；
Remaining group is divided into water.
Hydrochloric acid：Effective corrosion Clay Mineral, the organic depositions such as carbonate rock and corresponding inorganic scale, colloid, pitch；
Ammonium fluoride：It is reacted with hydrochloric acid and generates HF, improve the solution ration to organic depositions such as inorganic scale, colloid, pitches；
Corrosion inhibiter：Metal pipe line is protected not to be corroded；
Chelating agent：Highly effective chelating Ca2+、Mg2+、Fe3+Equal metal ions, avoid the formation of secondary or precipitate three times.
The acid fluid system can effective corrosion Clay Mineral, carbonate rock and corresponding inorganic scale, colloid, pitch etc.
Organic deposition, chelating agent energy highly effective chelating Ca2+、Mg2+、Fe3+Equal metal ions, avoid the formation of secondary or precipitate three times, a kind of liquid
Substitute the prepad fluid of conventional acidulation, treatment fluid and the work of three step of after pad, simplify acidizing treatment technique, save the construction time and at
This, reduces security risk and labor intensity, and it is ethylenediamine tetraacetic acid (EDTA) and complexon I, molecular weight to improve construction effect chelating agent
Respectively 292 and 191.Hydrochloric acid and ammonium fluoride are that commercially available chemistry is pure or technical pure.Hydrochloric acid, ammonium fluoride press 2:1.5 are configured to matter
Measure the aqueous solution that percent concentration is 20%.
The corrosion inhibiter be selected from triethanolamine, mercaptan amine,BenzotriazoleIt presses, ethylene glycol dimethyl ether is by 1:1:1:1 matches
The aqueous solution that mass percent concentration is 20.0% is made.
The chelating agent is selected from ethylenediamine tetra-acetic acid, complexon I presses 2:1 is configured to 25.0% aqueous solution.
Embodiment 4：
A kind of system of water injection well online injection acidification acid fluid system is provided on the basis of embodiment 2, in the present embodiment
Preparation Method takes plastic beaker one, adds the water of formula ratio, sequentially adds hydrochloric acid, ammonium fluoride, after being stirred evenly with sticking plaster,
Corrosion inhibiter, chelating agent are sequentially added, after being sufficiently stirred.
Hydrochloric acid：Effective corrosion Clay Mineral, the organic depositions such as carbonate rock and corresponding inorganic scale, colloid, pitch；
Ammonium fluoride：It is reacted with hydrochloric acid and generates HF, improve the solution ration to organic depositions such as inorganic scale, colloid, pitches；
Corrosion inhibiter：Metal pipe line is protected not to be corroded；
Chelating agent：Highly effective chelating Ca2+、Mg2+、Fe3+Equal metal ions, avoid the formation of secondary or precipitate three times.
Hydrochloric acid, ammonium fluoride press 2:1.5 are configured to the aqueous solution that mass percent concentration is 20%.
The corrosion inhibiter be selected from triethanolamine, mercaptan amine,Benzotriazole, ethylene glycol dimethyl ether press 1:1:1:1 prepares
The aqueous solution for being 20.0% at mass percent concentration.
The chelating agent is selected from ethylenediamine tetra-acetic acid, complexon I presses 2:1, which is configured to mass percent concentration, is
25.0% aqueous solution.
Embodiment 5：
A kind of preparation method of water injection well online injection acidification acid fluid system, takes 1000ml plastic beakers one, adds distillation
Hydrochloric acid 200ml, 150ml ammonium fluoride is added in water 300ml, after being stirred evenly with sticking plaster, sequentially adds the addition of 100ml acid solutions
Agent, 150ml chelating agents, after being sufficiently stirred.
5 mouthfuls of wells of Changqing oilfields carry out construction operation, and implementation result see the table below.
Changqing oilfields site operation tables of data
Construction results show that water injection well online injection acidification acid fluid system can effectively improve water injection well situation, increase stratum
Permeability improves formation fluid circulation situation, has good actual application value, be embodied in：
It 1, can highly effective chelating Ca2+、Mg2+、Fe3+Equal metal ions, avoid the formation of the precipitations such as fluoaluminate, fluosilicate；
2, directly dilution can be required to use according to site operation, does not need extemporaneous preparation.
3, on the basis of conventional acid fluid system, a kind of liquid completes prepad fluid, treatment fluid and the after pad of conventional acidulation
Part thereof rock is fully dissolved in three step operations, plays corrosion of the mud acid to clay, quartz, feldspar；
4, H can be slowly released+, acid-rock reaction speed is slow, achievees the purpose that deep acidification, while expanding seepage channel；
5, the organic depositions such as inorganic scale, colloid, pitch in reservoir are dissolved, reduces filtrational resistance.
Claims (2)
1. a kind of water injection well online injection is acidified acid fluid system, it is characterised in that：Component is as follows by mass percentage：
Hydrochloric acid 5.0% ~ 20.0%；
Ammonium fluoride 5.0% ~ 15.0%；
Corrosion inhibiter 2.0 ~ 10.0%；
Chelating agent 3.0% ~ 15.0%；
Remaining group is divided into water；The chelating agent is ethylenediamine tetra-acetic acid, complexon I by 2:1 to be configured to mass percent dense
The aqueous solution that degree is 25.0%；The corrosion inhibiter is triethanolamine, mercaptan amine, benzotriazole and ethylene glycol dimethyl ether by 1:
1:1:1 is configured to the aqueous solution that mass percent concentration is 20.0%；The chelating agent ethylenediamine tetra-acetic acid and complexon I
Molecular weight be respectively 292 and 191.
2. a kind of preparation method of water injection well online injection acidification acid fluid system as described in claim 1, it is characterised in that：Tool
Body step is：
Plastic beaker one is taken, the water of formula ratio is added, sequentially adds hydrochloric acid, the ammonium fluoride of formula ratio, is stirred with sticking plaster equal
After even, sequentially add corrosion inhibiter, the chelating agent of formula ratio, make hydrochloric acid, ammonium fluoride, corrosion inhibiter, chelating agent ratio be 5.0%
~20.0%：5.0%~15.0%：2.0~10.0%：3.0% ~ 15.0%, after being sufficiently stirred.
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| Application Number | Priority Date | Filing Date | Title |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510959481.3A CN105482802B (en) | 2015-12-21 | 2015-12-21 | Online acidizing acid liquid injection system for water injection well and preparation method of online acidizing acid liquid injection system |
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| CN105482802B true CN105482802B (en) | 2018-08-14 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106590616A (en) * | 2016-12-20 | 2017-04-26 | 陕西海山能源发展有限公司 | Organic chelating acid system for oil-water well acidification |
| CN106833581A (en) * | 2016-12-29 | 2017-06-13 | 中国石油天然气股份有限公司 | Chelating agent and preparation method and application thereof |
| CN106833577A (en) * | 2016-12-29 | 2017-06-13 | 中国石油天然气股份有限公司 | Construction method for cleaning and preventing scale on-line acidification multi-section plug |
| CN106645137A (en) * | 2016-12-29 | 2017-05-10 | 中国石油天然气股份有限公司 | Method for testing chelating capacity of chelating acid to metal calcium ions |
| CN106841513A (en) * | 2016-12-29 | 2017-06-13 | 中国石油天然气股份有限公司 | Method for testing chelating ability of chelating acid to metal iron ions |
| CN106645558A (en) * | 2016-12-29 | 2017-05-10 | 中国石油天然气股份有限公司 | Method for testing chelating capacity of chelating acid to metal magnesium ions |
| CN108467724A (en) | 2018-03-12 | 2018-08-31 | 中国石油天然气股份有限公司 | Online shunt acid continuously injected into water injection well and preparation method thereof |
| CN111057534B (en) * | 2019-11-18 | 2022-08-05 | 中国石油天然气股份有限公司 | Emulsion acidification yield-increasing and injection-increasing agent and preparation and use methods thereof |
| CN113122221A (en) * | 2021-04-06 | 2021-07-16 | 西安石油大油气科技有限公司 | Acid liquor system for online acidification of water injection well for oil exploitation and preparation process thereof |
| CN115491186B (en) * | 2021-06-17 | 2024-08-30 | 中国石油天然气股份有限公司 | Injection-increasing agent for hypotonic strong water-sensitive stratum and application thereof |
| CN114181692A (en) * | 2021-12-23 | 2022-03-15 | 北京金圣奥能源技术有限公司 | Polybasic chelated acidic alcohol-based blending-free fracturing fluid and preparation method and application thereof |
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| CN101864287A (en) * | 2010-06-08 | 2010-10-20 | 西安石油大学 | Composite retarded acid |
| CN101974322A (en) * | 2010-11-01 | 2011-02-16 | 中国石油大学(华东) | Chelating acid of sandstone |
| CN102634332A (en) * | 2012-03-26 | 2012-08-15 | 中国石油天然气股份有限公司 | Blocking remover for pressure-reducing steam injection of high-clay-content sandstone oil reservoir |
-
2015
- 2015-12-21 CN CN201510959481.3A patent/CN105482802B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101864287A (en) * | 2010-06-08 | 2010-10-20 | 西安石油大学 | Composite retarded acid |
| CN101974322A (en) * | 2010-11-01 | 2011-02-16 | 中国石油大学(华东) | Chelating acid of sandstone |
| CN102634332A (en) * | 2012-03-26 | 2012-08-15 | 中国石油天然气股份有限公司 | Blocking remover for pressure-reducing steam injection of high-clay-content sandstone oil reservoir |
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