CN100551993C - Be used for the acid of corroding sandstone - Google Patents
Be used for the acid of corroding sandstone Download PDFInfo
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- CN100551993C CN100551993C CNB2007100191954A CN200710019195A CN100551993C CN 100551993 C CN100551993 C CN 100551993C CN B2007100191954 A CNB2007100191954 A CN B2007100191954A CN 200710019195 A CN200710019195 A CN 200710019195A CN 100551993 C CN100551993 C CN 100551993C
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- sandstone
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- corrosion inhibitor
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Abstract
The invention provides a kind of acid that is used for corroding sandstone, its weight percent consists of: phosphoric acid complex compound 2～20%, ammonium bifluoride 1～20%, acetate 0.01～5%, citric acid 0.01～2%, acidification corrosion inhibitor 0.1～3%, mutual solvent 0.1～5%, anti-newborn emulsion splitter 0.1～2%, clay stabilizer 0.01～10%, surplus is a water.Principal feature of the present invention: 1) action effect is remarkable, and effect of increasing production is obvious, and validity period is long; 2) protection reservoir, scale inhibition, anti-sealing lock, water-sensitive injury; 3) acidifying speed is slow, and reaction is even, and the injury ma is few, the intensity height; 4) surface tension is low, and influent is effective.
Description
Technical field
The present invention relates to the chemical agent that a kind of acidification technology of oil well uses, be specifically related to the acid that is used for corroding sandstone that a kind of oil layer unblocking is used.
Background technology
At present, for making the low oil well production increasing of rate of permeation, generally adopt method from acid to oil well that inject, make the sandstone reaction in acid and the sandstone reservoir, corroding sandstone improves the rate of permeation of oil well, reaches the purpose of volume increase.Existing the sandstone reservoir acidification is used the mixed acid of hydrochloric acid and hydrofluoric acid usually, i.e. mud acid, conventional mud acid is in HCl: HF is 4: 1 ratio preparation, also has fluoram (NH
4HF
2) be dissolved in and prepare HF among the HCl, form the mud acid blockages relieving fluid.But nearest studies show that, reduce potential fluoride salt precipitation, and this ratio should be 6: 1 at least, and preferably 9: 1, in addition, conventional soil acid acidizing technology speed of response was fast, and corrosion is strong, is easy to generate precipitation, has reduced effect of increasing production.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, and a kind of de-plugging that provides, corrosion are little, be difficult for to produce the sedimentary acid that is used for corroding sandstone.Thereby play the effect of stopping up and increasing matrix permeability of removing.
For achieving the above object, the technical solution adopted in the present invention is: a kind of acid that is used for corroding sandstone, form by following raw materials by weight percent:
Phosphoric acid complex compound 2～20%
Ammonium bifluoride 1～20%
Acetate 0.01～5%
Citric acid 0.01～2%
Acidification corrosion inhibitor 0.1～3%
Mutual solvent 0.1～5%
Anti-newborn emulsion splitter 0.1～2%
Clay stabilizer 0.01～10%
Surplus is a water.
Described acidification corrosion inhibitor is that aldehyde amine ketone contracts can polymkeric substance, tetramethyl pyridine and benzyl chloride polymkeric substance, piperazine miscellany and alkyl benzyl polymkeric substance or many alkyl Benzyl Chloride polymkeric substance; Described mutual solvent is ethylene glycol monobutyl ether or non-ion fluorin surfactant; Described anti-newborn emulsion splitter is Soxylat A 25-7 nonionogenic tenside, polyoxy organosilicon nonionogenic tenside, polyoxyethylene oxypropylene four block polyethers or polyoxyethylene oxypropylene three block polyethers; Described clay stabilizer is polydimethyl allyl amine, Poly Dimethyl Diallyl Ammonium Chloride or poly-epoxychloropropane dimethylamine.
In preparation process of the present invention, the negatively charged ion of fluorochemical is to be provided by the dissolved ionic fluoride saltization, and 1 HF molecule is to be combined into by 1 oxonium ion and 1 fluoride anion.Owing to the reason of the pH value of this miscellany causes oxonium ion and active HF concentration all very low, so the shock absorption of weak acid and salt of weak acid forms balance.When this acid and stratum reacted, the balance of this system was destroyed, activates said process once more, and up to rebuliding balance, as long as the concentration of solute is abundant, the acidification reaction speed of this solvent is very stable.When preparation is used for corroding sandstone sour, have only 3 hydrogen ion hydrolysis the strongest to produce HF, remaining is not had an effect, because of they need hydrolysis under the condition of PH＞4.The strongest saloid acid of hydrionic property class, and the most weak hydrogen ion property class is like carbonic acid, sort buffer effect make the speed of response of acid and clay and carbonate slow down several times, are equivalent to retarded acid.And speed of response can change by the acid that other acid substitutes some corroding sandstones, and for example hydrochloric acid is faster than the speed that organic acid forms HF.
In addition, also have following synergistic effect when acidifying strata: (1) when beginning to react with the stratum, because chemisorption forms layer of aluminum-silicate-phosphate layer around clay, its thickness is less than 1 μ m, solubleness is very low in weak acid and water, but can be dissolved fast by HCl.This layer film has blocked clay and has further reacted, thereby can prevent the basement rock fragmentation; (2) acid that is used for corroding sandstone has anti-absorption and water-wet characteristic, promotes the reaction of HF and quartz, and is although speed of response is slower than mud acid, higher to the solubleness of quartz; (3) acid that is used for corroding sandstone is a kind of good dispersant and scale inhibitor, therefore can postpone and suppress precipitation formation in the immediate vicinity of wellbore.
The present invention compared with prior art has the following advantages: the present invention can guarantee effectively that acid enters oil and water well well depths, little to formation damage, overcome acidifying in the past easily form acid sludge, need the row of returning, steam circle is little, validity period is short, on-the-spot dangerous big problem.Advantage with hypotoxicity, low smell, low-corrosiveness, not only can solve the problem of conventional oil and water well fouling, oil layer blocking, product itself also has certain germicidal action, can solve and suppress bacteriogenic movement stops up, through collaborative adjustment technology, can solve the blockage problem that polymer flooding causes.In the process of de-plugging, new injury is not caused on the stratum, do not produce secondary sedimentation, have long-time deposition scale effect; Also can produce the effect of good anti-swollen steady sand after the de-plugging, because the process of its de-plugging is slow, the rock core skeleton is not caused violent injury, avoid occurring the regular mud acid acidifying after, easily to the stratum is caused skeleton injury, formation collapse, shaked out easily, the de-plugging validity period is short problem.
Description of drawings
Fig. 1 is the present invention and regular mud acid acidifying velocity variations synoptic diagram.
Fig. 2 is to use the rock core Strength Changes synoptic diagram behind the present invention and the regular mud acid.
Among the figure: A represents 5% mud acid acidified aqueous solution speed change curves, B represents 5% acidified aqueous solution speed change curves of the present invention, C represents to use the rock core Strength Changes curve behind the 5% mud acid aqueous solution, D represents to use the rock core Strength Changes curve behind 5% aqueous solution of the present invention, β represents sandstone corrosion amount, η represents the rock core change rate of strength, and t represents the time.
Embodiment
Following examples are all by weight:
Embodiment 1
Phosphoric acid complex compound 10%
Ammonium bifluoride 10%
Acetate 2%
Citric acid 1%
Aldehyde amine ketone condensation polymer 1%
Ethylene glycol monobutyl ether 1%
Soxylat A 25-7 nonionogenic tenside 1%
Polydimethyl allyl amine 2%
Water is 72%.
Above-mentioned each component is made the acid that the present invention is used for corroding sandstone after mixed.
Embodiment 2
Phosphoric acid complex compound 15%
Ammonium bifluoride 15%
Acetate 3%
Citric acid 2%
Tetramethyl pyridine and benzyl chloride polymkeric substance 3%
Non-ion fluorin surfactant 5%
Polyoxy organosilicon nonionogenic tenside 2%
Poly Dimethyl Diallyl Ammonium Chloride 5%
Water is 50%.
Above-mentioned each component is made the acid that the present invention is used for corroding sandstone after mixed.
Embodiment 3
Phosphoric acid complex compound 20%
Acetate 1%
Citric acid 0.5%
Piperazine miscellany and alkyl benzyl polymkeric substance 0.5%
Ethylene glycol monobutyl ether 2%
Soxylat A 25-7 nonionogenic tenside 0.5%
Poly-epoxychloropropane dimethylamine 0.5%
Water is 55%.
Above-mentioned each component is made the acid that the present invention is used for corroding sandstone after mixed.
Embodiment 4
Phosphoric acid complex compound 8%
Ammonium bifluoride 7%
Acetate 4%
Citric acid 1%
Aldehyde amine ketone condensation polymer 1%
Non-ion fluorin surfactant 2%
Polyoxyethylene oxypropylene three block polyethers 1.5%
Polydimethyl allyl amine 3.5%
Water is 72%.
Above-mentioned each component is made the acid that the present invention is used for corroding sandstone after mixed.
Phosphoric acid complex compound 20%
Ammonium bifluoride 5%
Acetate 3%
Citric acid 1.5%
Many alkyl Benzyl Chloride polymkeric substance 2.5%
Ethylene glycol monobutyl ether 5%
Polyoxyethylene oxypropylene four block polyethers 0.1%
Poly-epoxychloropropane dimethylamine 0.9%
Water is 62%.
Above-mentioned each component is made the acid that the present invention is used for corroding sandstone after mixed.
The structural formula of phosphoric acid complex compound of the present invention (PBTCA):
Main feature of the present invention: 1) action effect is remarkable, and effect of increasing production is obvious, and the term of validity is long; 2) The protection reservoir, scale inhibition, anti-sealing lock, water-sensitive injury; 3) acidifying speed is slow, and reaction is evenly hindered The evil rock matrix is few, the intensity height; 4) surface tension is low, and influent is effective.
The present invention not only can be applied to separately oil well leaking stoppage technology, can also be applied to as assistant In the fracture acidizing technology.
Claims (5)
1, a kind of acid that is used for corroding sandstone, form by following raw materials by weight percent:
Phosphoric acid complex compound PBTCA 2～20%
Ammonium bifluoride 1～20%
Acetate 0.01～5%
Citric acid 0.01～2%
Acidification corrosion inhibitor 0.1～3%
Mutual solvent 0.1～5%
Anti-newborn emulsion splitter 0.1～2%
Clay stabilizer 0.01～10%
Surplus is a water.
2, the acid that is used for corroding sandstone according to claim 1 is characterized in that described acidification corrosion inhibitor is an aldehyde amine ketone condensation polymer, or tetramethyl pyridine and benzyl chloride polymkeric substance.
3, the acid that is used for corroding sandstone according to claim 1 is characterized in that described mutual solvent is ethylene glycol monobutyl ether or non-ion fluorin surfactant.
4, the acid that is used for corroding sandstone according to claim 1 is characterized in that described anti-newborn emulsion splitter is Soxylat A 25-7 nonionogenic tenside, polyoxyethylene oxypropylene four block polyethers or polyoxyethylene oxypropylene three block polyethers.
5, the acid that is used for corroding sandstone according to claim 1 is characterized in that described clay stabilizer is polydimethyl allyl amine, Poly Dimethyl Diallyl Ammonium Chloride or poly-epoxychloropropane dimethylamine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100191954A CN100551993C (en) | 2007-11-27 | 2007-11-27 | Be used for the acid of corroding sandstone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100191954A CN100551993C (en) | 2007-11-27 | 2007-11-27 | Be used for the acid of corroding sandstone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101161762A CN101161762A (en) | 2008-04-16 |
| CN100551993C true CN100551993C (en) | 2009-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100191954A Expired - Fee Related CN100551993C (en) | 2007-11-27 | 2007-11-27 | Be used for the acid of corroding sandstone |
Country Status (1)
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Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101851496B (en) * | 2009-08-14 | 2013-03-13 | 新疆德蓝股份有限公司 | Novel high-efficient sand-carrying acid fracturing agent |
| CN101787269A (en) * | 2010-03-05 | 2010-07-28 | 西安石油大学 | Low-injury sandstone acid used for acidification technology of oil well |
| CN101812291B (en) * | 2010-04-22 | 2012-12-26 | 中国石油化工股份有限公司 | Sticky stable acid liquor |
| CN103074050B (en) * | 2011-10-26 | 2015-07-29 | 中国石油化工股份有限公司 | A kind of high shale content sandstone reservoir scale protective type many hydrogen retarded acid |
| CN102775974B (en) * | 2012-07-17 | 2014-05-14 | 大庆井升伟业油田技术服务有限公司 | Active mixed acid plugging removal solution applicable to low permeability reservoir |
| CN102775975B (en) * | 2012-07-19 | 2014-02-26 | 中国石油天然气股份有限公司 | Blocking remover for oil well reservoir |
| CN102942907A (en) * | 2012-11-23 | 2013-02-27 | 大庆百晟石油科技有限公司 | Novel profile control rapid degradation liquid |
| CN103013489A (en) * | 2012-12-17 | 2013-04-03 | 中国石油天然气股份有限公司 | Acidizing blocking remover and preparation method thereof |
| CN104046346B (en) * | 2013-03-13 | 2017-01-25 | 中国石油天然气股份有限公司 | Oil field water injection well descaling agent and preparation method thereof |
| CN103497756B (en) * | 2013-09-24 | 2016-04-20 | 北京恩瑞达科技股份有限公司 | For removing the acidification blocking remover of oil field contamination and plugging |
| CN105275438B (en) * | 2014-12-28 | 2017-12-19 | 新疆科力新技术发展股份有限公司 | The anti-technology that disappears of sensitive reservoir expansion |
| CN104962266A (en) * | 2015-06-17 | 2015-10-07 | 成都高普石油工程技术有限公司 | Oil well cleaning scale inhibitor |
| CN106190074A (en) * | 2016-07-14 | 2016-12-07 | 东营盛世石油科技有限责任公司 | The cleaning de-plugging agent of a kind of environmental protection and preparation method |
| CN106967402A (en) * | 2017-03-16 | 2017-07-21 | 中国石油化工股份有限公司 | A kind of acidification blocking remover and its construction method suitable for deep volcanic rock gas reservoir |
| CN110396397B (en) * | 2019-07-23 | 2021-07-23 | 中国石油集团渤海钻探工程有限公司 | Application of organic amine salt in well drilling field |
| CN113563864A (en) * | 2020-04-29 | 2021-10-29 | 中国石油天然气股份有限公司 | Sandstone reservoir retarded acid, application and production increase transformation method of sandstone reservoir |
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- 2007-11-27 CN CNB2007100191954A patent/CN100551993C/en not_active Expired - Fee Related
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| CN101161762A (en) | 2008-04-16 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C14 | Grant of patent or utility model | ||
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Xi'an Petroleum Great Petroleum Technology Co., Ltd. Assignor: Xian Petroleum Univ. Contract record no.: 2011610000169 Denomination of invention: Acid for corroding sandstone Granted publication date: 20091021 License type: Exclusive License Open date: 20080416 Record date: 20110907 |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091021 Termination date: 20121127 |