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Safety blocking remover for oilfield fractured well

An oilfield fracturing and plugging removal agent technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as unsafe oilfields, hidden dangers, and poor results, and achieve small equipment damage, thorough plugging removal, and Improve water quality and prevent blockage

Inactive Publication Date: 2013-10-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional plugging removal agents and plugging removal measures are not effective, and cause unsafe hidden dangers to the oil field

Method used

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  • Safety blocking remover for oilfield fractured well
  • Safety blocking remover for oilfield fractured well
  • Safety blocking remover for oilfield fractured well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Oil field fracturing well safety plugging remover, composed of the following components in volume percentage:

[0008]

[0009] Wherein the double base curing cracking agent is compounded by H chemical substances and complexes, said H chemical substances refer to chemical substances that can generate oxygen free radicals after decomposition, and said H chemical substances Contains Calcium Peroxide, Potassium Persulfate, Complexes Contains Diphenylthiourea, EDTA. The double-base curing cracking agent is a synthetic product of at least one of the above-mentioned H chemicals and at least one of the above-mentioned complexes. The dispersant is triethylhexyl phosphoric acid, methyl amyl alcohol, one of polyacrylamide, the earth acid is a mixed acid of hydrofluoric acid and hydrochloric acid, and the corrosion inhibitor is composed of quinoline, Halogenated hydrocarbon, dehydrated alcohol, alkyl polyoxyethylene ether with a molecular weight of 826, hydrochloric acid and m...

Embodiment 2

[0011] Oil field fracturing well safety plugging remover, composed of 1.0% double-base solidification cracking agent, 3.0% dispersant, 0.1% earth acid, 1.5% corrosion inhibitor, 1.0% clay anti-swelling agent, and other components are water:

[0012] Wherein the double-base curing cracking agent is compounded by H chemical substances and complexes, the H chemical substances are calcium peroxide, and the complexes are diphenylthiourea. The double-base curing cracking agent is a synthetic product of calcium peroxide and diphenylthiourea. The dispersant is triethylhexyl phosphoric acid, the earth acid is a mixed acid of hydrofluoric acid and hydrochloric acid, and the corrosion inhibitor is composed of quinoline, halogenated hydrocarbon, dehydrated alcohol, and an alkane with a molecular weight of 826. The product synthesized by base polyoxyethylene ether, hydrochloric acid and methanol, and the clay stabilizer is potassium chloride solution. Earth acid is a mixed acid of hydrofl...

Embodiment 3

[0014] Oil field fracturing well safety plugging remover, composed of 3.0% double-base curing cracking agent, 4.5% dispersant, 0.2% earth acid, 2.25% corrosion inhibitor, 2.0% clay anti-swelling agent, and other components are water:

[0015] Wherein the double base curing cracking agent is compounded by H chemical substances and complexes, the H chemical substances are potassium persulfate, and the complexes are ethylenediaminetetraacetic acid. The double-base curing cracking agent is a synthetic product of potassium persulfate and ethylenediaminetetraacetic acid. The dispersant is methyl amyl alcohol, the earth acid is a mixed acid of hydrofluoric acid and hydrochloric acid, and the corrosion inhibitor is made of quinoline, halogenated hydrocarbon, dehydrated alcohol, and an alkyl group with a molecular weight of 826. Polyoxyethylene ether, hydrochloric acid and methanol synthesis product, described clay stabilizer is potassium chloride solution. Earth acid is a mixed acid ...

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Abstract

The invention relates to a blocking remover for an oilfield fractured well and particularly relates to a safety blocking remover for the oilfield fractured well. The safety blocking remover for the oilfield fractured well, which is disclosed by the invention, can be used for efficiently and safely removing blocking caused by oilfield fracture and is high in blocking removal efficiency. The safety blocking remover consists of the following components in percentage by volume; 1.0-5.0 percent of double-base solidified cracking agent A, 3.0-6.0 percent of dispersing agent B, 0.1-0.3 percent of mud acid C, 1.5-3.0 percent of corrosion inhibitor D and 1.0-3.0 percent of clay anti-swelling agent E. Due to adoption of the blocking remover, the blocking caused by oilfield fracture can be thoroughly removed; and the blocking remover has a sterilization function and has the advantages that the water quality is improved, the blocking is prevented from generating again, the in-place permeability is increased, the fluidity of crude oil is improved and the recovery rate of crude oil and the water injection rate of a water well are increased.

Description

technical field [0001] The invention relates to a plug-removing agent, in particular to a safe plug-removing agent for fracturing wells in oil fields. Background technique [0002] At present, fracturing is one of the main measures taken to increase production and injection in oilfields. While achieving the effect of increasing production, many injection wells have problems such as difficult injection and poor fracturing effects, which strictly restrict the application of fracturing technology and increase production capacity. less than effective performance. At present, most domestic oil fields are in the mid-to-late development stage. Fracturing is a production and injection technology used in almost all oil fields. The problem of clogging of fracturing wells is increasing day by day. Traditional plugging agents and plugging removal measures are not effective, and cause unsafe hidden dangers to oil fields. Contents of the invention [0003] The object of the present in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/528
Inventor 蔺爱国张菅刘新亮尹海亮凌大为李景一申美荣孙剑珍丁兴华
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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