Acidifying agent composition

A technology of composition and acidifying agent, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of poor acidizing permeability and inability to solve oil and gas scaling and plugging in sandstone reservoirs, and achieve moderate solvency and clay removal Mineral clogging, low cost effect

Inactive Publication Date: 2007-12-19
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of poor acidizing permeability of the acidifying agent in the prior art, which cannot solve the problem of fouling and clogging in the process of oil and gas exploitation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This example is used to illustrate the acidulant composition provided by the invention.

[0022] With 5 parts by weight of hydrochloric acid, 5 parts by weight of acetic acid, 5 parts by weight of citric acid, 2 parts by weight of hydrofluoric acid, 8 parts by weight of diethylene triamine phosphonic acid, 5 parts by weight of epoxypropyl trimethyl ammonium chloride and 2 parts by weight of One part of 2-benzyl imidazoline hydrochloride is dissolved in 68 parts by weight of water to obtain a uniform solution which is the acidulant composition of the present invention.

Embodiment 2

[0024] This example is used to illustrate the acidulant composition provided by the invention.

[0025] 8 parts by weight of nitric acid, 5 parts by weight of oxalic acid, 4 parts by weight of formic acid, 3 parts by weight of hydrofluoric acid, 3 parts by weight of triethylamine phosphonic acid, 10 parts by weight of 3-benzyl imidazoline hydrochloride and 2 parts by weight of isoascorbic acid Dissolving in 65 parts by weight of water to obtain a uniform solution is the acidulant composition of the present invention.

Embodiment 3

[0027] This example is used to illustrate the acidulant composition provided by the invention.

[0028] 20 parts by weight of phosphoric acid, 5 parts by weight of fluoboric acid, 3 parts by weight of diethylenetriaminephosphonic acid, 10 parts by weight of 3-benzylpyrrole hydrochloride, 5 parts by weight of nitrilotriacetic acid and 5 parts by weight of 3-chloro-2 -Hydroxymethylpropyltrimethylammonium chloride is dissolved in 52 parts by weight of water to obtain a uniform solution which is the acidulant composition of the present invention.

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PUM

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Abstract

The acidifying agent composition consists of the component A of at least one selected from HCl, phosphoric acid, HNO3 and organic carboxylic acid; the component B is HF or compound capable of producing HF; the component C of organic amine phosphonic acid; the component D of organic nitrogen-containing compound capable of producing ammonium salt through reaction with acid or its ammonium salt; and water. The acidifying agent composition of the present invention is used in eliminating deep blockage of sandstone reservoir and eliminating blockage in oil well, water well and deep stratum, and has obvious blockage eliminating effect and antiscaling performance on reservoir with high salt content and high scaling tendency. It has long effective acidifying period.

Description

technical field [0001] The present invention relates to an acidulant composition. Background technique [0002] Oil and gas field exploitation processes such as drilling, cementing, perforation, gravel packing, production, workover, chemical treatment and water injection often cause a variety of pollution, including organic matter plugging, wax, colloid, asphaltene, chemical additives and The clogging of inorganic particles and scale seriously affects oil and gas production. Therefore, acidifying agents are usually used to unblock oil and water wells. By injecting acidizing agent into the formation to react with acid-sensitive minerals and sediments to increase formation permeability, thereby increasing oil and gas production. This method is also often used to clean pollutants on the surface of pipelines and equipment. [0003] At present, the acidifying agent used in the oil field is mainly a conventional acid soil acid formed by an aqueous solution of 12 wt% HCl and 3 w...

Claims

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Application Information

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IPC IPC(8): C09K8/52C09K8/72
CPCC09K8/72C09K8/52
Inventor 郑延成佘跃惠周爱莲李克华
Owner YANGTZE UNIVERSITY
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