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Low-concentration carboxymethyl cross-linking agent and preparation method thereof

A carboxymethyl cross-linking agent and low-concentration technology, which is applied in the field of low-concentration carboxymethyl cross-linking agent and preparation, can solve the problems of reservoir damage, high residual rubber content, high gel-breaking residue content, etc., and achieve temperature resistance Good, good temperature and shear resistance effect

Active Publication Date: 2014-07-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]1. Due to the limitation of the degree of modification of hydroxypropyl guar gum, the fracturing fluid system using it as a thickener has a high content of gel-breaking residue, generally at Above 350mg / L
[0005] 2. The hydroxypropyl guar gum system thickener and organic boron crosslinking agent have reverse glue phenomenon, the glue is not broken completely, and the residual glue content is high
[0006] Two factors cause the above-mentioned fracturing fluid to cause great damage to the reservoir after fracturing and affect the effect of fracturing

Method used

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  • Low-concentration carboxymethyl cross-linking agent and preparation method thereof
  • Low-concentration carboxymethyl cross-linking agent and preparation method thereof
  • Low-concentration carboxymethyl cross-linking agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Preparation method of low concentration carboxymethyl crosslinking agent:

[0022] In a 1000ml four-necked round bottom flask equipped with a thermometer, dropping funnel and reflux device, add 320 grams of zirconium lactate to 200 grams of ethanol solution with a content of 80%, and gradually add 130 grams of phosphinocarboxylic acid under high-speed stirring Stabilizer, slowly release heat, keep the temperature above 45°C, add 100 grams of triethanolamine with a content of 80% under stirring; heat the mixture to 60°C, keep the temperature constant for 4 hours, and continue stirring for 1 hour after adding; Sodium oxide aqueous solution and 30% isopropanol are neutralized to a pH above 8; then the mixture is heated to 80°C, kept at a constant temperature for 4 hours, and stirred with 200ml of water; a transparent light yellow JL-11 crosslinking agent can be obtained. The product can be used as a crosslinking agent for carboxymethylhydroxypropyl guar gum fracturing flui...

Embodiment 2

[0024] Preparation method of low concentration carboxymethyl crosslinking agent:

[0025] In a 1000ml four-necked round bottom flask equipped with a thermometer, dropping funnel and reflux device, add 200 grams of zirconium lactate to 130 grams of ethanol solution with a content of 80%, and gradually add 100 grams of phosphinocarboxylic acid under high-speed stirring Stabilizer, exothermic slowly, keeping the temperature above 45°C, adding 30 grams of triethanolamine with a content of 80% under stirring; heating the mixture to 60°C, keeping the temperature constant for 4 hours, and continuing to stir for 1 hour after adding; Sodium oxide aqueous solution and 10 isopropanol are neutralized to a pH above 8; then the mixture is heated to 80°C, kept at a constant temperature for 4 hours, and stirred with 150ml of water; a transparent light yellow JL-11 crosslinking agent can be obtained. The product can be used as a crosslinking agent for carboxymethylhydroxypropyl guar gum fractu...

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Abstract

The invention relates to a low-concentration carboxymethyl cross-linking agent and a preparation method thereof. The low-concentration carboxymethyl cross-linking agent comprises the following chemical raw materials by weight: 100 to 300 parts of water, 130 to 200 parts of ethanol, 200 to 320 parts of zirconium lactate, 10 to 20 parts of inorganic base, 100 to 130 parts of phosphino-carboxylic acid stabilizing agent, 30 to 100 parts of organic amine and 10 to 30 parts of isopropanol. The preparation method comprises the following steps: taking the above-mentioned chemical raw materials in any proportion, wherein the chemical raw materials sum to 580 to 1100 parts; adding zirconium lactate into 80% of an ethanol solution, adding the phosphino-carboxylic acid stabilizing agent, maintaining a temperature to be 45 DEG C and adding 80% of triethanolamine; heating an obtained mixture to 60 DEG C; neutralizing the mixture with an aqueous sodium hydroxide solution and isopropanol until the pH value of the mixture is 8; and heating an obtained mixture to 80 DEG C so as to obtain the transparent primrose cross-linking agent. The cross-linking agent has the characteristics of cross-linking delaying performance, high temperature resistance, stable performance and low concentration.

Description

technical field [0001] The invention relates to a cross-linking agent used in the fracturing process of gas well reconstruction, in particular to a low-concentration carboxymethyl cross-linking agent and a preparation method, which is suitable for carrying proppant in the process of gas well fracturing reconstruction. Background technique [0002] At present, the fracturing technology in the oil field is a conventional production stimulation technology. It is to press out the artificial fractures of the reservoir, use the fracturing fluid to carry a certain concentration of proppant, and lay it in the artificial fractures to improve the conductivity of the reservoir, so as to achieve production stimulation. Effect. As the main agent of water-based fracturing fluid, the thickener is used to increase the viscosity of the fracturing fluid, reduce the fluid loss of the fracturing fluid, suspend and carry the proppant. [0003] At present, the cross-linking agent used in oil fie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/665C09K8/685C09K8/887C09K8/90
Inventor 赵勇韩兴刚李达白建文程芳胡子见蔺吉春朱李安赖海涛衣德强邝聃朱更更张春阳金龙程晓亮魏巍高峰
Owner PETROCHINA CO LTD