CN102816559A - Chemical blocking remover for polymer flooding injection well - Google Patents
Chemical blocking remover for polymer flooding injection well Download PDFInfo
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- CN102816559A CN102816559A CN2012102660825A CN201210266082A CN102816559A CN 102816559 A CN102816559 A CN 102816559A CN 2012102660825 A CN2012102660825 A CN 2012102660825A CN 201210266082 A CN201210266082 A CN 201210266082A CN 102816559 A CN102816559 A CN 102816559A
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- injection well
- agent
- blocking remover
- polymkeric substance
- water
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Abstract
The invention relates to a chemical blocking remover for a polymer flooding injection well, mainly solving the problem that the existing blocking remover adopting hydrogen peroxide and chlorine dioxide oxidant is poor in stability and unsafe. The chemical blocking remover consists of a former agent and a main agent, wherein the former agent consists of 15-20% of solid oxidant and 80-85% of water by weight; and the main agent consists of 7-10% of hydrochloric acid, 2-4% of nitric acid, 1-2% of glacial acetic acid, 2.0% of ammonium chloride, 1.0% of triethanolamine, 1.0-2.0% of corrosion inhibitor and 79.0-86.0% of water by weight. The chemical blocking remover for the polymer flooding injection well has the characteristics of good stability, easiness for storage and transportation, no toxicity, no odor, no pollution and safety.
Description
Technical field:
The present invention relates to a kind of chemical plugging removal agent in the oil recovery field, oil field, especially a kind ofly be applicable to the agent of polymkeric substance drive injection well chemical plugging removal.
Background technology:
Polymer flooding is that RF mainstay technology is improved in the oil field.In process of polymer flooding development, along with the increase of polymkeric substance accumulative total IR, totally annotate people's situation variation, the notes people pressure that quite a few well arranged near or reach the parting pressure of oil reservoir, compelled downward modulation rate of injection, impact polymer drives effect.The basic reason that causes this situation is that obstruction has appearred in the shaft bottom of polymer injection well.Material is stopped up in the polymkeric substance shaft bottom nuclear that mainly to be inorganic insoluble matter form with clay (comprising sand grains), and slightly soluble in the polymkeric substance and undissolved molecule utmost point group be wrapped in inorganic core around, the system structure of formation polymer plugging.According to the material composition analysis, can remove through chemical process more than 80% in the polymer plugging thing.The polymkeric substance of oil field releasing at present unblocking agent is oxygenants such as ydrogen peroxide 50 and dioxide peroxide, these series products poor stabilities, and long storage time is prone to lose activity, and particularly produces ClO in the chlorine dioxide reaction process
2And Cl
2, the two has severe toxicity, simultaneously, when concentration reaches 6000ppm, is prone to blast the harm construction.
Summary of the invention:
The invention reside in and overcome the unsafe problems of oxygenant de-plugging product stability difference such as the employing ydrogen peroxide 50 that exists in the background technology and dioxide peroxide, and a kind of polymkeric substance drive injection well chemical plugging removal agent that is applicable to is provided.This is applicable to the agent of polymkeric substance drive injection well chemical plugging removal, has good stability, is easy to store and transportation, have simultaneously nontoxic, odorless, the characteristics of non-pollution safety.
The present invention solves its problem and can reach through following technical scheme: this is applicable to that the agent of polymkeric substance drive injection well chemical plugging removal is made up of preceding dose and host two portions, is made up of solid oxidizing agent 15～20% and water 80～85% for preceding dose; Host is made up of hydrochloric acid 7～10%, nitric acid 2%～4%, Glacial acetic acid min. 99.5 1%～2%, ammonium chloride 2.0%, trolamine 1.0%, inhibiter 1.0～2.0% and water 79.0～86.0%, above-mentioned each components based on weight percentage amount.
Described solid oxidizing agent is a sodium carbonate peroxide; Described inhibiter is 2 isopropyl imidazole quinoline and thiocarbamide 1:1 compound.
The present invention and above-mentioned background compared with techniques can have following beneficial effect: this is applicable to that the agent of polymkeric substance drive injection well chemical plugging removal mainly is made up of two portions; At first adopt the aqueous solution of solid oxidizing agent preparation to remove the winding that the polymer molecule utmost point is rolled into a ball; Dissolve inorganic solid phase particles and clay (comprising sand grains) through having the oxidisability acid solution again; Polymkeric substance drive injection well oil layer blocking is removed in the two comprehensive action, and can prevent to stop up generation once more.The solid oxidizing agent that is wherein adopted has overcome the shortcoming that polymer plugging unblocking agent commonly used is removed in the oil field, has good stability, is easy to store and transportation, have simultaneously nontoxic, odorless, advantage such as pollution-free.Its de-plugging mechanism is after sodium carbonate peroxide gets into the stratum decomposition reaction to take place; Discharge a large amount of active oxygens, the high molecular polymer in near-well-bore area is silted in oxidative degradation up, and its viscosity is declined to a great extent; Flowability improves and is easy to from the stratum discharge, and removes the obstruction to the stratum.Experimental data shows that the solution that solid oxidizing agent is prepared is better to the viscosity reducing effect of polymers soln, polymer solution viscosity is reduced to about 1.2mPa.s, near clear water viscosity by 41.6mPa.s; The solution that solid oxidizing agent is prepared has good sterilizing ability, can be used to remove the obstruction that bacterium is caused, and efficiently reaches 100%.
Description of drawings:
Accompanying drawing 1 solid oxidation agent solution (XPJ-II) is to the polymers soln degradation curve.
Embodiment:
To combine specific embodiment that the present invention is described further below:
The used solid oxidizing agent of embodiment is sodium carbonate peroxide (Na
2CO
4); Inhibiter is 2 isopropyl imidazole quinoline and thiocarbamide 1:1 compound.
Embodiment 1
Take by weighing solid oxidizing agent 15g and water 85g is mixed with preceding agent; Take by weighing hydrochloric acid 7g, nitric acid 2g, Glacial acetic acid min. 99.5 1g, ammonium chloride 2.0g, trolamine 1.0g, inhibiter 1.0g and water 86.0g and be mixed with host.
Embodiment 2
Take by weighing solid oxidizing agent 20g and water 80g is mixed with preceding agent; Take by weighing hydrochloric acid 10g, nitric acid 4g, Glacial acetic acid min. 99.5 2g, ammonium chloride 2.0g, trolamine 1.0g, inhibiter 2.0g and water 79.0g and be mixed with host.
Embodiment 3
Take by weighing solid oxidizing agent 18g and water 82g is mixed with preceding agent; Take by weighing hydrochloric acid 8g, nitric acid 3g, Glacial acetic acid min. 99.5 1g, ammonium chloride 2.0g, trolamine 1.0g, inhibiter 1.0g and water 84.0g and be mixed with host.
This is applicable to polymkeric substance drive injection well chemical plugging removal agent performance evaluation:
1. polymer degradation performance
The solution (XPJ-II) that the polymkeric substance and the solid oxidizing agent of different ratios are prepared mixes back room temperature held, and measures viscosity in certain time interval.
Fig. 1 is that solid oxidation agent solution (XPJ-II) is to the polymers soln degradation curve; Data show; The solution that solid oxidizing agent is prepared (XPJ-II) is good to the viscosity reducing effect of polymers soln, and under the ratio of polymers soln: unblocking agent=4:1,1.5h interpolymer soltion viscosity is reduced to about 1.2mPa.s; Near clear water viscosity, can satisfy injection well de-plugging requirement.
2. to bacterium de-plugging performance evaluation
The solution that solid oxidizing agent is prepared (XPJ-II) has good sterilizing ability, can be used to remove the obstruction that bacterium is caused, and efficiently reaches 100%, the solution that table 1 is prepared for solid oxidizing agent (XPJ-II) bactericidal property.
The solution that table 1 solid oxidizing agent is prepared (XPJ-II) bactericidal property
Remarks: X
SRBBe sulphate reducing bacteria
3. rock core de-plugging performance
For further estimating the de-plugging performance of unblocking agent, carried out rock core de-plugging experiment.Table 2 is a rock core de-plugging experimental data.Experimental principle is to adopt unblocking agent to after polymers soln (simulated field compound concentration) displacement, and the rock core that rate of permeation descends significantly carries out de-plugging.
Table 2 rock core de-plugging experimental data
To after polymers soln (simulated field compound concentration) displacement, after the rock core that rate of permeation descends significantly carried out de-plugging, the rate of permeation recovery rate reached more than 80%, and plugging removal effect is better.
The present invention is used for the test of polymkeric substance drive injection well chemical plugging removal agent spot effect:
Daqing oil field polymkeric substance drive injection well test in place, the de-plugging construction technology is: at first preceding dose of solution (XPJ-II) that is solid oxidizing agent is prepared is injected oil reservoir, closing well reaction 12h; Drive a well then according to injecting well regulation water injection rate every day 50% water filling 1 day, the host of reinjecting acid blockages relieving fluid, closing well reaction 8h; Drive a well again and utilize the bottomhole wellbore pressure discharge opeing, to pH >=6.0; At last, according to injecting the normal polymer waterflooding of well regulation IR every day.
Test in place situation and effect analysis:
Adopt this chemical plugging removal agent to inject aboveground the application at up to a hundred mouthfuls of polymer floodings of Daqing oil field, and obtained plugging removal effect preferably.Table 3 is an injection well unblocking and injection increasing technology mining site effect.15 mouthfuls of injection well plugging removal effects that statistics Sa Nan block is carried out are with the average step-down 1.11MPa of contrast individual well before the measure, day augmented injection 21.45m
3, validity period reached more than 180 days.
Table 3 injection well unblocking and injection increasing technology mining site effect
Claims (3)
1. one kind is applicable to the agent of polymkeric substance drive injection well chemical plugging removal, and this chemical plugging removal agent is made up of preceding dose and host two portions, is made up of solid oxidizing agent 15～20% and water 80～85% for preceding dose; Host is made up of hydrochloric acid 7～10%, nitric acid 2%～4%, Glacial acetic acid min. 99.5 1%～2%, ammonium chloride 2.0%, trolamine 1.0%, inhibiter 1.0～2.0% and water 79.0～86.0%, above-mentioned each components based on weight percentage amount.
2. a kind of polymkeric substance drive injection well chemical plugging removal agent that is applicable to according to claim 1, it is characterized in that: described solid oxidizing agent is a sodium carbonate peroxide.
3. a kind of polymkeric substance drive injection well chemical plugging removal agent that is applicable to according to claim 1, it is characterized in that: described inhibiter is 2 isopropyl imidazole quinoline and thiocarbamide 1:1 compound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210266082.5A CN102816559B (en) | 2012-07-30 | 2012-07-30 | Chemical blocking remover for polymer flooding injection well |
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|---|---|---|---|
| CN201210266082.5A CN102816559B (en) | 2012-07-30 | 2012-07-30 | Chemical blocking remover for polymer flooding injection well |
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| CN102816559A true CN102816559A (en) | 2012-12-12 |
| CN102816559B CN102816559B (en) | 2014-07-02 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104194755A (en) * | 2014-08-06 | 2014-12-10 | 党庆功 | Superstrong pincerlike scale dissolving liquid |
| CN105219366A (en) * | 2014-06-18 | 2016-01-06 | 中国石油化工股份有限公司 | A kind of polymer chemistry unblocking agent |
| CN105985759A (en) * | 2015-02-11 | 2016-10-05 | 中国海洋石油总公司 | Composite blocking remover for oil well and preparation method thereof |
| CN109652043A (en) * | 2019-02-18 | 2019-04-19 | 大庆井升伟业油田技术服务有限公司 | One kind being suitable for the chemical plugging removal agent of tri compound drive injection well |
| CN110819326A (en) * | 2019-10-30 | 2020-02-21 | 中国石油化工股份有限公司 | Depolymerizing agent for plug degradation in polymer flooding and method of use thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105219366A (en) * | 2014-06-18 | 2016-01-06 | 中国石油化工股份有限公司 | A kind of polymer chemistry unblocking agent |
| CN104194755A (en) * | 2014-08-06 | 2014-12-10 | 党庆功 | Superstrong pincerlike scale dissolving liquid |
| CN104194755B (en) * | 2014-08-06 | 2017-02-08 | 党庆功 | Superstrong pincerlike scale dissolving liquid |
| CN105985759A (en) * | 2015-02-11 | 2016-10-05 | 中国海洋石油总公司 | Composite blocking remover for oil well and preparation method thereof |
| CN109652043A (en) * | 2019-02-18 | 2019-04-19 | 大庆井升伟业油田技术服务有限公司 | One kind being suitable for the chemical plugging removal agent of tri compound drive injection well |
| CN109652043B (en) * | 2019-02-18 | 2020-05-19 | 大庆井升伟业油田技术服务有限公司 | Chemical blocking remover suitable for ternary combination flooding injection well |
| CN110819326A (en) * | 2019-10-30 | 2020-02-21 | 中国石油化工股份有限公司 | Depolymerizing agent for plug degradation in polymer flooding and method of use thereof |
| CN110819326B (en) * | 2019-10-30 | 2022-10-21 | 中国石油化工股份有限公司 | Depolymerization agent for plug degradation in polymer flooding and method of use thereof |
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| CN102816559B (en) | 2014-07-02 |
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Owner name: DAQING QIXING PETROLEUM TECHNOLOGY CO., LTD. Effective date: 20140423 |
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Free format text: CORRECT: ADDRESS; FROM: DAQING, HEILONGJIANG PROVINCE TO: 163000 DAQING, HEILONGJIANG PROVINCE |
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Effective date of registration: 20140423 Address after: 503, room 12, innovation building, science and Technology Innovation Park, No. 163000, Xinke Road, hi tech Zone, Heilongjiang, Daqing Applicant after: Daqing Jingsheng Weiye Oilfield Technology Service Co.,Ltd. Applicant after: DAQING QIXING PETROLEUM SCIENCE AND TECHNOLOGY LTD. Address before: Room 503, Chuangxin building, 12, Xinke Road, hi tech Zone, Daqing, Heilongjiang Applicant before: Daqing Jingsheng Weiye Oilfield Technology Service Co.,Ltd. |
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