Chelating agent and preparation method and application thereof

A chelating agent and reaction technology, applied in the field of chelating agent and its preparation, can solve the problems of complex construction process, poor inhibition performance, poor temperature resistance, etc., and achieve the effects of wide source of raw materials, stable performance and short reaction time.

Inactive Publication Date: 2017-06-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These chelating agents have the problems of low yield, poor selectivity, and high cost in the production process, and there are disadvantages such as poor temperature resistance, poor compatibility, poor stability, and poor inhibition performance in the field construction of acid injection, resulting in the need for pre-fluid and treatment for conventional acidification. There are three kinds of liquids, liquid and post-positioning liquid, which need to be flowed back after the construction, and the construction process is complicated

Method used

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  • Chelating agent and preparation method and application thereof
  • Chelating agent and preparation method and application thereof
  • Chelating agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment 1 provides a chelating agent, which is composed of the following raw material components in mass percentage, 15% to 30% iron ion stabilizer, 5% to 12% dichloroethane, 10% to 20% ethanol, 10% ~20% sodium hydroxide, 5%~10% carbon disulfide, 1.5%~4.5% regulator, and the balance is water.

[0038] The iron ion stabilizer can chelate Ca 2+ 、AL 3+ , Fe 3+ and other metal ions to avoid the formation of secondary or tertiary precipitates. The solvent can make the iron ion stabilizer and ethylene dichloride react as a homogeneous reaction, and is commercially available chemically pure or industrially pure. 50%-100% of the mass fraction of the water phase of the dichloroethane reacts with the iron ion stabilizer to improve its chelating ability. The sodium hydroxide is commercially available chemically pure or industrially pure, which improves the reaction rate. The carbon disulfide is an analysis solvent and a reactant, and is an industrial product. The reg...

Embodiment 2

[0041] On the basis of Example 1, the iron ion stabilizer is a solution prepared from ethylenediaminetetraacetic acid and nitrilotriacetic acid, and the mass ratio is (1-1.5):(2-2.5). Preferably, the mass ratio of ethylenediaminetetraacetic acid to nitrilotriacetic acid is 1:2.

Embodiment 3

[0043] On the basis of Example 1, the regulator is a solution made of citric acid with a mass percentage concentration of 36% and acetic acid with a mass percentage concentration of 64%, and the mass ratio is (2~3):(1~1.5) . Preferably, the mass ratio of citric acid to acetic acid is 2:1.

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Abstract

The invention provides a chelating agent and a preparation method and application thereof. According to the total amount of the prepared chelating agent as 100%, the chelating agent is prepared from the following raw materials in weight percentage: 15% to 30% of ferrous stabilizer, 5% to 12% of dichloroethane, 10% to 20% of solvent, 10% to 20% of sodium hydroxide, 5% to 10% of carbon disulfide, 1.5% to 4.5% of conditioning agent and the balance of water. The raw materials of the chelating agent disclosed by the invention have wide sources and low cost. The chelating agent disclosed by the invention has stable performance and long service life, can be stored and used for a long time and has good compatibility with acidized acid liquor systems.

Description

technical field [0001] The present invention relates to the field of oil well exploitation, in particular to the field of acidizing plugging removal for water injection wells, and more specifically to a chelating agent and its preparation method and application. Background technique [0002] In oilfield acidizing construction, high-concentration acid liquid will dissolve pipelines, equipment and formation clay minerals and cause precipitation during the process of stirring acid liquid and pumping reaction. Therefore, it is necessary to add a chelating agent that can inhibit precipitation in the acid liquid. [0003] Currently widely used chelating agents are mainly lactic acid, acetic acid, ethylenediaminetetraacetic acid, dihydroxymaleic acid, gluconic acid, polyphosphate, and sodium erythorbate. These chelating agents have the problems of low yield, poor selectivity, and high cost in the production process, and there are disadvantages such as poor temperature resistance, p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528C09K8/78E21B37/06
CPCC09K8/528C09K8/78E21B37/06E21B43/25C09K8/74E21B43/28C07C229/16B01J2219/00177C07C53/08B01J19/0013B01J2219/00051C07C59/265
Inventor 邓志颖慕立俊陆红军姚斌陆小兵王勇宋昭杰隋蕾王尔珍
Owner PETROCHINA CO LTD
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