CN1532259A - Powder nitric acid deblocking agent - Google Patents
Powder nitric acid deblocking agent Download PDFInfo
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- CN1532259A CN1532259A CNA031112269A CN03111226A CN1532259A CN 1532259 A CN1532259 A CN 1532259A CN A031112269 A CNA031112269 A CN A031112269A CN 03111226 A CN03111226 A CN 03111226A CN 1532259 A CN1532259 A CN 1532259A
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- nitric acid
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- powder nitric
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Abstract
The present invention relates to oil field chemical application and is a kind of acidified unblocking agent for water injection well. The powdered nitric acid unblocking agent consists of HCl 8-14 wt%, powdered nitric acid 3-5 wt%, HF 1-1.5 wt%, octyne alcohol 0.8-1.2 wt%, alkylphenol ethoxylate 0.6-0.8 wt%, triethanolamine 0.8-1.2 wt%, polyoxyethylene polyoxypropylene propanediol ether 0.4-0.6 wt% and water 75.7-85.4 wt%. The addition of powdered nitric acid can reduce the consumption of HF, increase the dissolving capacity of the acidified liquid to earth acid insoluble matter, reduce the destruction of acidified liquid to rock skeleton, and stabilize clay owing to organic amine salt produced with the powdered nitric acid and stratum.
Description
Technical field: the present invention relates to the oilfield chemistry Application Areas, is a kind of water injection well acidification blocking remover.
Background technology: the acidifying technology is one of oil formation improvement technology commonly used, it is some mineral composition by tamper in the acid solution corrosion blowhole or basement rock itself, thereby improve the connectedness in rock interior duct, remove the pollution on stratum, improve the profit capacity of well.
Originally used regular mud acid acidifying technology always.Regular mud acid is formulated by a certain percentage by hydrochloric acid, hydrofluoric acid and various additive, utilizes carbonic acid rock salt, the irony composition in the dissolving with hydrochloric acid sandstone formation wherein and keeps low pH value, prevents that Calcium Fluoride (Fluorspan) and silicon hydroxide precipitation from generating; Utilize wherein hydrofluoric acid dissolution silicoide and drilling fluid, and the tamper that caused such as expansible clay mineral, recover and improve the rate of permeation of immediate vicinity of wellbore, reach the purpose of increasing yield and injection.The regular mud acid speed of response is fast, treatment radius is little, and pH value Gao Shiyi produces secondary sedimentation, and validity period is short, be applicable to placanticline inside because of the new brought in well of drilling fluid contamination with because of the water injection well of iron rust, calcium dirt and well control fluid contamination and plugging, but can not adapt to the needs that low permeability reservoir is removed multiple obstruction.For this reason, since the nineties, acid solutions such as novel mud acid, oil and water well snaking unblocking agent, hot gas acid, compound acid have mainly been studied and have used.In addition, also study acidifying technology such as having used organic acid, low carbon acid, fluoroboric acid at the particular case of low permeability oil field reservoir, but number of applications is less.
Although on the acidification to dispel block new technology, carried out a large amount of research trials, because above-mentioned acid solution all is to be the composite acidizing fluid that forms of main acid solution with mud acid or hydrochloric acid, to the shale index height, well effect that repeatedly reacidizing is invalid is undesirable.
Summary of the invention: it is strong to the objective of the invention is to develop a kind of dissolving power to the mud acid insolubles, little to the destruction of ma, clay is had the powder nitric acid unblocking agent of stable effect.The present invention is made up of HCl, powder nitric acid, HF, octyne alcohol, alkylphenol polyoxyethylene, trolamine, polyoxyethylene polyoxypropylene propylene glycol and water, and prescription by its weight ratio is: HCl: powder nitric acid: HF: octyne alcohol: alkylphenol polyoxyethylene: trolamine: polyoxyethylene polyoxypropylene propylene glycol: water=8～14%: 3～5%: 1～1.5%: 0.8～1.2%: 0.6～0.8%: 0.8～1.2%: 0.4～0.6%: 75.7～85.4%.The present invention has the dissolving power of mud acid insolubles strong, the characteristics little to the destruction of ma, simultaneously can generate organic amine salt, clay is had stable effect, be suitable for shale index height, invalid advantages such as well of reacidizing repeatedly because powder nitric acid acts on the stratum.
Embodiment 1: adopt HCl, powder nitric acid, HF, octyne alcohol, alkylphenol polyoxyethylene, trolamine, polyoxyethylene polyoxypropylene propylene glycol to be mixed with the aqueous solution, be made into HCl: powder nitric acid: HF: octyne alcohol: alkylphenol polyoxyethylene: trolamine: the polyoxyethylene polyoxypropylene propylene glycol: water=8%: 5%: 1.5%: 0.8%: 0.8%: 1.0%: 0.6%: 82.3% powder nitric acid unblocking agent.
Embodiment 2: the method with embodiment 1 can be made into HCl: powder nitric acid: HF: octyne alcohol: alkylphenol polyoxyethylene: trolamine: the polyoxyethylene polyoxypropylene propylene glycol: water=14%: 3%: 1.5%: 1.2%: 0.6%: 0.8%: 0.4%: 78.5% powder nitric acid unblocking agent.
Embodiment 3: the method with embodiment 1 can be made into HCl: powder nitric acid: HF: octyne alcohol: alkylphenol polyoxyethylene: trolamine: the polyoxyethylene polyoxypropylene propylene glycol: water=10%: 4%: 1.5%: 1.0%: 0.8%: 1.2%: 0.4%: 81.1%.
Field conduct of the present invention is identical with general common acidizing treatment, acid discharge after 3 hours reaction times, acid discharge amount=injection acid amount+20m
3Liquid, normal water filling after the acid discharge.
After acid solution entered the stratum, the carbonic acid rock salt in the dissolving with hydrochloric acid sandstone formation, irony composition also kept low pH value, prevented that Calcium Fluoride (Fluorspan) and silicon hydroxide precipitation from generating; Utilize wherein hydrofluoric acid dissolution silicoide and drilling fluid, and the tamper that caused such as expansible clay mineral, recover and improve the rate of permeation of immediate vicinity of wellbore, reach the purpose of increasing yield and injection.Powder nitric acid and stratum effect generate nitric acid on the one hand, and dissolving stratum mineral and tamper can generate organic amine salt on the other hand, and clay is had stable effect.Trolamine can be to the different kinds of ions complexing, the generation of secondary sedimentation when avoiding the acid solution pH value to raise, and complexed surfactant and emulsion splitter can be avoided oil-water emulsion, and strengthen the row's of returning ability of residual acid.By the comprehensive action of above-mentioned main acid solution and additive, reach the purpose of acidification to dispel block.
Claims (1)
1, a kind of powder nitric acid unblocking agent, form by HCl, powder nitric acid, HF, octyne alcohol, alkylphenol polyoxyethylene, trolamine, polyoxyethylene polyoxypropylene propylene glycol, water, it is characterized in that prescription by its weight ratio is: HCl: powder nitric acid: HF: octyne alcohol: alkylphenol polyoxyethylene: trolamine: polyoxyethylene polyoxypropylene propylene glycol: water=8～14%: 3～5%: 1～1.5%: 0.8～1.2%: 0.6～0.8%: 0.8～1.2%: 0.4～0.6%: 75.7～85.4%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031112269A CN1532259A (en) | 2003-03-18 | 2003-03-18 | Powder nitric acid deblocking agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031112269A CN1532259A (en) | 2003-03-18 | 2003-03-18 | Powder nitric acid deblocking agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1532259A true CN1532259A (en) | 2004-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CNA031112269A Pending CN1532259A (en) | 2003-03-18 | 2003-03-18 | Powder nitric acid deblocking agent |
Country Status (1)
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| CN (1) | CN1532259A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333038C (en) * | 2005-10-18 | 2007-08-22 | 中国石油大学(华东) | High performance sludge inhibitor |
| CN101434834B (en) * | 2008-12-08 | 2010-10-06 | 辽河石油勘探局 | Integrative blockage relieving agent for uranium deposit ore bed |
| CN101362942B (en) * | 2008-09-26 | 2011-09-28 | 大庆石油管理局 | Formation opener agent for low permeable reservoir of oilfield |
| CN102775973A (en) * | 2012-07-17 | 2012-11-14 | 大庆井升伟业油田技术服务有限公司 | Scale removing agent applicable to alkaline-surfactant-polymer flooding and scale removing and unfreezing process |
| CN102775980A (en) * | 2012-07-17 | 2012-11-14 | 大庆井升伟业油田技术服务有限公司 | Acidizing block remover suitable for complex lithologic reservoir |
| CN104498009A (en) * | 2014-11-24 | 2015-04-08 | 中国石油天然气股份有限公司 | Blockage relieving agent capable of releasing heat and increasing energy, blockage relieving method, and injection device |
| CN106281277A (en) * | 2016-07-22 | 2017-01-04 | 大庆东宽久久科技有限公司 | A kind of de-plugging scale removal increases adopts liquid |
| CN111621276A (en) * | 2019-02-27 | 2020-09-04 | 中国石油天然气股份有限公司 | Solid acid plugging agent and method for removing stratum plugging by using same |
-
2003
- 2003-03-18 CN CNA031112269A patent/CN1532259A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1333038C (en) * | 2005-10-18 | 2007-08-22 | 中国石油大学(华东) | High performance sludge inhibitor |
| CN101362942B (en) * | 2008-09-26 | 2011-09-28 | 大庆石油管理局 | Formation opener agent for low permeable reservoir of oilfield |
| CN101434834B (en) * | 2008-12-08 | 2010-10-06 | 辽河石油勘探局 | Integrative blockage relieving agent for uranium deposit ore bed |
| CN102775973A (en) * | 2012-07-17 | 2012-11-14 | 大庆井升伟业油田技术服务有限公司 | Scale removing agent applicable to alkaline-surfactant-polymer flooding and scale removing and unfreezing process |
| CN102775980A (en) * | 2012-07-17 | 2012-11-14 | 大庆井升伟业油田技术服务有限公司 | Acidizing block remover suitable for complex lithologic reservoir |
| CN104498009A (en) * | 2014-11-24 | 2015-04-08 | 中国石油天然气股份有限公司 | Blockage relieving agent capable of releasing heat and increasing energy, blockage relieving method, and injection device |
| CN106281277A (en) * | 2016-07-22 | 2017-01-04 | 大庆东宽久久科技有限公司 | A kind of de-plugging scale removal increases adopts liquid |
| CN111621276A (en) * | 2019-02-27 | 2020-09-04 | 中国石油天然气股份有限公司 | Solid acid plugging agent and method for removing stratum plugging by using same |
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