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Safe blocking remover polymer injection well of oil field

A technology for injecting polymer wells and removing plugging agents, which is applied in the directions of drilling compositions, chemical instruments and methods, and can solve problems such as hidden dangers, poor effects, and unsafe oil fields.

Inactive Publication Date: 2013-12-11
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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  • Safe blocking remover polymer injection well of oil field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0005] The oilfield polymer injection well safety plugging remover is characterized in that it consists of the following components in volume percentage:

[0006] A double base curing cracking agent 1.0%------5.0%

[0007] B dispersant 3.0%------6.0%

[0008] C Self-generated gas foaming energy-enhancing diffuser 1.0%------5.0%

[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 one of triethylhexyl phosphoric acid, methyl amyl alcohol, and polyacrylamide, and the self-generated gas foaming and energy-enha...

Embodiment 2

[0011] Oil field polymer injection well safety plugging remover, composed of 1.0% double-base solidification cracking agent, 3.0% dispersant, 1.0% self-generated gas foaming energy-enhancing diffusing 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, and the self-generated gas foaming energy-enhancing diffusing agent is compounded with an aqueous solution of sodium nitrite and ammonium chloride. The aqueous solution of sodium nitrite and ammonium chloride used in the self-generating gas foaming energy-enhancing diffusing agent is configured at a concentration of 1% by mass. The medicaments and water of the above-mentioned components are miscible...

Embodiment 3

[0014] Oilfield polymer injection well safety plugging remover, composed of 3.0% double-base solidification 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, and the self-generated gas foaming and energy-enhancing diffusing agent is compounded with an aqueous solution of sodium nitrite and ammonium chloride. The aqueous solution of sodium nitrite and ammonium chloride used in the self-generating gas foaming energy-enhancing diffusing agent is configured at a concentration of 1% by mass. The medicaments and water of th...

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Abstract

The invention relates to a blocking remover, in particular to a safe blocking remover for a polymer injection well of an oil field. The safe blocking remover for the polymer injection well of the oil field efficiently and safely removes blocking of the polymer injection well. The blocking remover comprises the following ingredients by volume percentage: A, 1.0-5.0% of diradical curing cracking agent, B, 3.0-6.0% of dispersing agent, and C, 1.0-5.0% of self-gas generation foaming energization diffusant. With the adoption of the scheme, the remover can efficiently and safely dissolve the blocking caused by polymers in the oil field, is high in blocking removal efficiency, can thoroughly remove the blocking caused by the polymers, overcomes the hidden danger of unstability of the common blocking remover, has a sterilization function, can improve water quality and prevent re-formation of the blocking, improves in-place permeability, flowability of crude oil and recovery efficiency of the crude oil, increases a water injection rate of the well, is simple in configuration and convenient to use, shortens the construction time and lowers the construction cost.

Description

technical field [0001] The invention relates to a plug-removing agent, in particular to a safe plug-removing agent for polymer injection wells in oil fields. Background technique [0002] At present, large-area polymer flooding is being carried out in oilfields. While achieving the effect of increasing production, many injection wells have problems such as difficult injection and poor displacement effect, which strictly restricts the application of polymer technology and prevents the production capacity from being effectively utilized. . At present, most domestic oil fields are in the mid-to-late development stage. Polymer injection is a production and injection technology used in almost all oil fields. The clogging problem of polymer injection wells is becoming more and more serious. 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 inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524
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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