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Composite retarded acid

A technology of retarding acid and hydrochloric acid, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of reducing the service life of oil casing, corrosion of oil well pipe string, formation collapse, etc. The effect of permeability and simple process

Inactive Publication Date: 2017-03-01
王娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in order to improve the ultimate recovery of oilfields, many measures are taken to increase production in the development, among which acidizing is one of the main measures to increase production. This method is feasible, but different acidizing processes have different effects and have different defects, such as simple Soil acid acidification has a certain effect of increasing production, but the corrosion of the oil well string is relatively large, reducing the service life of the oil casing, causing collapse of the formation, and causing the old bottom layer to be blocked

Method used

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Examples

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Effect test

Embodiment approach 1

[0012] In terms of parts by mass, it includes the following components: 35 parts of sodium o-nitrophenolate, 25 parts of hydrochloric acid, 15 parts of citric acid, 3 parts of amino acids, 5 parts of acidifying corrosion inhibitor, 12 parts of ethylene vinyl acetate, dodecylbenzene 2.6 parts of sodium sulfonate, 1.8 parts of phosphoric acid, 3.2 parts of sucrose fatty acid ester, 35 parts of deionized water.

Embodiment approach 2

[0014] In terms of parts by mass, it includes the following components: 43 parts of sodium o-nitrophenolate, 30 parts of hydrochloric acid, 22 parts of citric acid, 9 parts of amino acids, 11 parts of acidifying corrosion inhibitor, 18 parts of ethylene vinyl acetate, dodecylbenzene 5.4 parts of sodium sulfonate, 4.2 parts of phosphoric acid, 6.5 parts of sucrose fatty acid ester, 50 parts of deionized water.

Embodiment approach 3

[0016] In terms of parts by mass, it includes the following components: 38 parts of sodium o-nitrophenolate, 28 parts of hydrochloric acid, 18 parts of citric acid, 5 parts of amino acids, 9 parts of acidifying corrosion inhibitor, 13 parts of ethylene vinyl acetate, dodecylbenzene 3.3 parts of sodium sulfonate, 2.5 parts of phosphoric acid, 4.3 parts of sucrose fatty acid ester, 40 parts of deionized water.

[0017] Implementation mode three:

[0018] In terms of parts by mass, it includes the following components: 41 parts of sodium o-nitrophenolate, 29 parts of hydrochloric acid, 21 parts of citric acid, 8 parts of amino acids, 10 parts of acidifying corrosion inhibitor, 16 parts of ethylene vinyl acetate, dodecylbenzene 4.6 parts of sodium sulfonate, 3.9 parts of phosphoric acid, 5.5 parts of sucrose fatty acid ester, 45 parts of deionized water.

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PUM

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Abstract

The invention relates to the technical field of retarded acid, specifically to a composite retarded acid. The composite retarded acid comprises the following components in parts by mass: 35 to 43 parts of sodium 2-nitrophenolate, 25 to 30 parts of hydrochloric acid, 15 to 22 parts of citric acid, 3 to 9 parts of amino acid, 5 to 11 parts of an acidizing corrosion inhibitor, 12 to 18 parts of ethylene vinyl acetate, 2.6 to 5.4 parts of sodium dodecyl benzene sulfonate, 1.8 to 4.2 parts of phosphoric acid, 3.2 to 6.5 parts of sucrose fatty acid ester and 35 to 50 parts of deionized water. By adopting the above-mentioned formula, the composite retarded acid realizes low damage or no damage in the process of acidification, and maximumly improves the penetration rate in an acidification zone; in addition, the composite retarded acid has the advantages of low component cost, simple process and facilitation to popularization and application.

Description

technical field [0001] The invention relates to the technical field of retarded acids, in particular to a composite retarded acid. Background technique [0002] At present, in order to improve the ultimate recovery of oilfields, many production increase measures are taken in the development, among which acidizing is one of the main production increasing measures. This method is feasible, but different acidizing processes have different effects and also have different defects, such as simple Soil acid acidification has a certain effect of increasing production, but the corrosion of the oil well string is relatively large, reducing the service life of the oil casing, causing collapse of the formation, and causing the old bottom layer to be blocked. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a composite retarded acid. [0004] In order to solve the above-mentioned technical problems, a kind of compound retarde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74C09K8/602C09K2208/32
Inventor 王娟
Owner 王娟
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