CN105462573A - Blocking remover for augmented injection of oilfield polymer-injected wells - Google Patents
Blocking remover for augmented injection of oilfield polymer-injected wells Download PDFInfo
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- CN105462573A CN105462573A CN201410455623.8A CN201410455623A CN105462573A CN 105462573 A CN105462573 A CN 105462573A CN 201410455623 A CN201410455623 A CN 201410455623A CN 105462573 A CN105462573 A CN 105462573A
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Abstract
The invention provides a blocking remover for augmented injection of oilfield polymer-injected wells. The blocking remover is prepared from the following raw materials in parts by volume: a. 1.0-5.0 parts of crude oil cleaning agent, b. 0.1-1.0 part of oxidation-reduction system and c. 2.0-4.0 parts of clay stabilizer, wherein the oxidation-reduction system is prepared from an oxidant and a reducer which are in the parts-by-mass proportioning ratio of 1: (0.2-0.5); and the clay stabilizer means KCl, NH4Cl, a polyquaternary ammonium salt or a quaternary ammonium salt. According to the blocking remover, the oxidation-reduction system serves as a main agent, and a polymer-injected-converted water-flooding well blocking remover is prepared from the crude oil cleaning agent, the clay stabilizer, and the like; oxygen gas generated by the oxidant is converted into hydroxyl radicals by the oxidation-reduction system, so that no gas is generated in constructed reservoirs; and meanwhile, the system is non-corrosive, thereby being a safe, environment-friendly and high-pertinency blocking removal system.
Description
Technical field:
The present invention relates to a kind of augmented injection system of the well for difficult water injection after injection well sequent water flooding in tertiary oil production in oil field process.Especially for using polyacrylamide and derivative thereof as the increasing injection system of the water injection well of flooding polymers.
Background technology:
Tertiary oil recovery is one of important development scheme in current oil field, has successively carried out the poly-work of note to a large amount of water injection wells, has achieved good development effectiveness.But water injection well is in the poly-sequent water flooding process of note, generally there is water injection pressure rising, inject the phenomenon of difficulty, be difficult to the situation reaching injection allocation amount, analyze with on-the-spot well-flushing sand washing, tamper is complicated, comprise polymkeric substance aggregate and reservoir silt and various dirty sample, complicated tamper and blocking mechanism cause the large feature of de-plugging process difficulty.The current de-plugging to this type of under-injected well is mainly based on acidifying, filling, and because specific aim is strong, technique is single, poor effect, is difficult to solve site problems, is badly in need of carrying out relevant Study on Process, solves an injection well water filling difficult problem.
The technique such as conventional acidulation, filling carries out de-plugging work, weak effect, and validity period is short; Use the strong oxidizer such as dioxide peroxide, hydrogen peroxide as unblocking agent, there is certain effect, but poor stability, be not suitable for accumulating and site operation.Safety, environmental requirement can not be met.The block releasing technique to such well reported can be divided into two classes, the first kind carries out de-plugging construction with strong oxidizer dioxide peroxide, hydrogen peroxide etc. to reservoir, but because it has stronger corrodibility, can explosion gas be produced simultaneously in accumulating and construction process, larger difficulty and potential safety hazard are caused to construction process; Hao Zhanyuan etc. (CN1435464) utilize Textone or sodium chlorate and phosphoric acid or citric acid reactions to produce dioxide peroxide in underground; Zhao Yingqiu etc. (CN1247734C, CN102925128A) have invented a kind of composite deblocking process, and it is mainly the mixture of calcium peroxide and peroxy tert-butyl alcohol to polymkeric substance de-plugging composition; Hu Xinsuo etc. (CN1480628) have invented a kind of method for removing blockage injecting hydrolyst ADS to stratum; The human hairs such as Lin Aiguo understand a kind of unblocking agent formula being major ingredient with double-basis solidification cracking agent, dispersion agent, self generating gas foaming energization diffusant.
Summary of the invention:
Object of the present invention is intended to overcome the deficiencies in the prior art, for the poly-follow-up problem turning water drive well and short of note, provide a kind of de-plugging efficiency high, without the high oilfield injection well augmented injection unblocking agent of gas generation, non-corrosiveness, security.
Object of the present invention realizes by following technical measures:
This unblocking agent is made up of the raw material of following parts by volume proportioning:
A. detergent for crude petroleum 1.0 ~ 5.0b. oxidation-reduction system 0.1 ~ 1.0
C. clay stabilizer 2.0 ~ 4.0.
Object of the present invention also realizes by following technical measures:
Described oxidation-reduction system is by oxygenant: reductive agent=1:0.2 ~ 0.5 proportion by weight is formed;
Described oxygenant comprises and is not limited only to potassium ferrate, potassium permanganate, calcium peroxide, Potassium Persulphate, Sodium Persulfate or ammonium persulphate;
The preferred potassium ferrate of described oxygenant, potassium permanganate, calcium peroxide, Potassium Persulphate, Sodium Persulfate or ammonium persulphate;
Described reductive agent comprises and is not limited only to S-WAT, ferrous sulfate or tin protoxide;
The preferred S-WAT of described reductive agent, ferrous sulfate or tin protoxide;
Described clay stabilizer comprises and is not limited to KCl, NH
4cl, polyquaternium or quaternary ammonium salt;
Described clay stabilizer refers to KCl, NH
4cl, polyquaternium or quaternary ammonium salt.
Above-mentioned detergent for crude petroleum Main Function is the sump oil being attached to polymkeric substance and rock surface in cleaning well; Oxidation-reduction system is the oxidation-reduction system formed by oxygenant and reductive agent, namely in the chemical substance being produced hydroxyl free radical in reaction process by oxidation-reduction system; Mainly in order to prevent, depolymerizing agent from causing clay swelling, migration causes reservoir to damage in the effect of clay stabilizer.
During use, by unblocking agent of the present invention under normal temperature according to unblocking agent: water=1:20 ~ 100 parts by volume proportioning adds water, stirs miscible.
The present invention is using oxidation-reduction system as host, gather with detergent for crude petroleum, clay stabilizer composition note simultaneously and turn water drive well unblocking agent, the oxygen that oxygenant produces is converted to hydroxyl free radical owing to employing oxidation-reduction system by this unblocking agent, produce without gas in construction reservoir, system non-corrosiveness simultaneously, safety and environmental protection.
Adopt the present invention, can the blocking that causes of the dissolving field polymers of highly effective and safe, play a protective role to reservoir, de-plugging efficiency is high simultaneously, can thoroughly remove the blocking that polymkeric substance causes, and overcomes the hidden danger of conventional unblocking agent insecurity; Increase zone permeability, improve crude oil fluidity, increase the water injection rate of well, reduce well injection pressure; Configure simple, easy to use, shorten the engineering time, reduce construction cost; Contrast traditional strong oxidizer depolymerizing agent, the depolymerizing agent that the present invention relates to is high safety in accumulating and construction process simultaneously, and non-explosive and toxic and harmful produce, and is that one is suitable for oilfield injection and turns water drive well augmented injection unblocking agent.The depolymerizing agent pH that simultaneously the present invention relates to is between 6-7, to preparation of construction and the corrosion-free effect of operating tool string.
Embodiment:
Embodiment 1:
Get 1.0 mass parts potassium ferrates to mix with 0.2 mass parts S-WAT, obtain oxidation-reduction system;
Get 5.0 parts by volume detergent for crude petroleum and 0.1 parts by volume oxidation-reduction system, 4.0 parts by volume KCl mix, obtain oilfield injection well augmented injection unblocking agent product.
During use, by oilfield injection well augmented injection unblocking agent of the present invention under normal temperature according to unblocking agent: water=1:100 parts by volume proportioning adds water, stir, miscible.
Embodiment 2:
Get 01.0 mass parts potassium ferrate to mix with 0.5 mass parts S-WAT, obtain oxidation-reduction system;
Get 1.0 parts by volume detergent for crude petroleum and 1.0 parts by volume oxidation-reduction systems, 2.0 parts by volume KCl mix, obtain oilfield injection well augmented injection unblocking agent product.
During use, by oilfield injection well augmented injection unblocking agent of the present invention under normal temperature according to unblocking agent: water=1:20 parts by volume proportioning adds water, stir, miscible.
Embodiment 3:
Get 1 mass parts potassium ferrate to mix with 0.35 mass parts S-WAT, obtain oxidation-reduction system;
Get 3.0 parts by volume detergent for crude petroleum and 0.5 parts by volume oxidation-reduction system, 3.0 parts by volume KCl mix, obtain oilfield injection well augmented injection unblocking agent product.
During use, by oilfield injection well augmented injection unblocking agent of the present invention under normal temperature according to unblocking agent: water=1:60 parts by volume proportioning adds water, stir, miscible.
Embodiment 4:
Replace potassium ferrate unlike with potassium permanganate, other is respectively with embodiment 1-3.
Embodiment 5:
Replace potassium ferrate unlike with calcium peroxide, other is respectively with embodiment 1-3.
Embodiment 6:
Replace potassium ferrate unlike with Potassium Persulphate, other is respectively with embodiment 1-3.
Embodiment 7:
Replace potassium ferrate unlike with Sodium Persulfate, other is respectively with embodiment 1-3.
Embodiment 8:
Replace potassium ferrate unlike with ammonium persulphate, other is respectively with embodiment 1-3.
Embodiment 9:
Replace S-WAT unlike with ferrous sulfate, other is respectively with embodiment 1-8.
Embodiment 10:
Replace S-WAT unlike with tin protoxide, other is respectively with embodiment 1-8.
Embodiment 11:
Unlike with NH
4cl replaces KCl, and other is respectively with embodiment 1-10.
Embodiment 12:
Replace KCl unlike with polyquaternium, other is respectively with embodiment 1-10.
Embodiment 13:
Replace KCl unlike with quaternary ammonium salt, other is respectively with embodiment 1-10.
Above embodiment is only the present invention's embodiment wherein, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
The each embodiment of subordinate list 1 is to Polyacrylamides For Enhanced Oil Recoveries depolymerization effect assessment table
The each embodiment of subordinate list 2 is to crosslinked displacement of reservoir oil polyacrylamide depolymerization effect assessment table
Claims (8)
1. an oilfield injection well augmented injection unblocking agent, is characterized in that it is made up of the raw material of following parts by volume proportioning:
A. detergent for crude petroleum 1.0 ~ 5.0b. oxidation-reduction system 0.1 ~ 1.0
C. clay stabilizer 2.0 ~ 4.0.
2. a kind of oilfield injection well augmented injection unblocking agent according to claim 1, is characterized in that described oxidation-reduction system is by oxygenant: reductive agent=1:0.2 ~ 0.5 proportion by weight is formed.
3. a kind of oilfield injection well augmented injection unblocking agent according to claim 2, is characterized in that described oxygenant comprises and is not limited only to potassium ferrate, potassium permanganate, calcium peroxide, Potassium Persulphate, Sodium Persulfate or ammonium persulphate.
4. a kind of oilfield injection well augmented injection unblocking agent according to claim 3, is characterized in that described oxygenant refers to potassium ferrate, potassium permanganate, calcium peroxide, Potassium Persulphate, Sodium Persulfate or ammonium persulphate.
5. a kind of oilfield injection well augmented injection unblocking agent according to claim 2, is characterized in that described reductive agent comprises and is not limited only to S-WAT, ferrous sulfate or tin protoxide.
6. a kind of oilfield injection well augmented injection unblocking agent according to claim 5, is characterized in that described reductive agent refers to S-WAT, ferrous sulfate or tin protoxide.
7. a kind of oilfield injection well augmented injection unblocking agent according to claim 1, is characterized in that described clay stabilizer comprises and is not limited to KCl, NH
4cl, polyquaternium or quaternary ammonium salt.
8. a kind of oilfield injection well augmented injection unblocking agent according to claim 7, is characterized in that described clay stabilizer refers to KCl, NH
4cl, polyquaternium or quaternary ammonium salt.
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| CN201410455623.8A CN105462573B (en) | 2014-09-09 | 2014-09-09 | A kind of oilfield injection well augmented injection de-plugging agent |
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| CN201410455623.8A CN105462573B (en) | 2014-09-09 | 2014-09-09 | A kind of oilfield injection well augmented injection de-plugging agent |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106634915A (en) * | 2016-12-30 | 2017-05-10 | 西南石油大学 | Thickened oil well polymer plugging remover |
| CN109504359A (en) * | 2019-01-17 | 2019-03-22 | 山东滨州昱诚化工科技有限公司 | A kind of oil extraction in oil field high polymer polyacrylamide degradation de-plugging agent and preparation method |
| CN111218266A (en) * | 2020-03-04 | 2020-06-02 | 中国海洋石油集团有限公司 | Composite blocking remover for polymer flooding reservoir and preparation and application methods thereof |
| CN111234794A (en) * | 2020-03-18 | 2020-06-05 | 北京大德广源石油技术服务有限公司 | Composite blocking remover and application method thereof |
| CN111607371A (en) * | 2020-04-30 | 2020-09-01 | 中海石油（中国）有限公司天津分公司 | Efficient blockage removing system for polymer flooding injection well, preparation method and application of efficient blockage removing system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106634915A (en) * | 2016-12-30 | 2017-05-10 | 西南石油大学 | Thickened oil well polymer plugging remover |
| CN109504359A (en) * | 2019-01-17 | 2019-03-22 | 山东滨州昱诚化工科技有限公司 | A kind of oil extraction in oil field high polymer polyacrylamide degradation de-plugging agent and preparation method |
| CN109504359B (en) * | 2019-01-17 | 2022-06-28 | 山东滨州昱诚化工科技有限公司 | High-molecular polyacrylamide degradation blocking remover for oil extraction in oil field and preparation method thereof |
| CN111218266A (en) * | 2020-03-04 | 2020-06-02 | 中国海洋石油集团有限公司 | Composite blocking remover for polymer flooding reservoir and preparation and application methods thereof |
| CN111234794A (en) * | 2020-03-18 | 2020-06-05 | 北京大德广源石油技术服务有限公司 | Composite blocking remover and application method thereof |
| CN111607371A (en) * | 2020-04-30 | 2020-09-01 | 中海石油（中国）有限公司天津分公司 | Efficient blockage removing system for polymer flooding injection well, preparation method and application of efficient blockage removing system |
| CN111607371B (en) * | 2020-04-30 | 2022-08-02 | 中海石油（中国）有限公司天津分公司 | Efficient blockage removing system for polymer flooding injection well, preparation method and application of efficient blockage removing system |
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| CN105462573B (en) | 2018-08-17 |
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