Densifier for aqueous fracturing fluid and preparation method thereof

A water-based fracturing and thickening agent technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of complex preparation process, high water-insoluble matter, reservoir damage, etc., and achieves simple preparation process, The effect of low damage to the bottom layer and high shear resistance

Active Publication Date: 2014-01-01
陕西延长石油丰源石油助剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of these substances as thickeners are: high water insoluble content, easy to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1

[0022] The thickening agent for water-based fracturing fluid of the present invention is composed of the following materials in parts by weight:

[0023] 50 parts of deionized water, 30 parts of 2-acrylamide-2-methylpropanesulfonate, 15 parts of acrylamide, 10 parts of methacrylamide, 10 parts of acrylic acid, 0.1 part of complexing agent, 1 part of chain transfer agent and 0.1 part of initiator.

[0024] The preparation method is as follows:

[0025] a. Mix and stir deionized water with 2-acrylamide-2-methylpropanesulfonate;

[0026] b. Add sodium hydroxide solution to the solution prepared in step a to adjust the pH to 5-10;

[0027] c. Add acrylamide, methacrylamide, acrylic acid, complexing agent, and chain transfer agent to the solution obtained in step b, and stir for 20-40 minutes by blowing nitrogen at a temperature of 30°C to 60°C;

[0028] d. Add the mixture obtained in step c to the initiator, and react for 4-10 hours to obtain the finished product.

Example Embodiment

[0029] Example 2

[0030] The thickening agent for water-based fracturing fluid of the present invention is composed of the following materials in parts by weight:

[0031] 20 parts of deionized water, 80 parts of 2-acrylamide-2-methylpropanesulfonate, 25 parts of acrylamide, 5 parts of methacrylamide, 5 parts of acrylic acid, 1 part of disodium ethylenediaminetetraacetic acid, chain transfer 0.1 part of the initiator and 1 part of the initiator; the initiator is a mixed solution of ammonium persulfate and sodium bisulfite in a weight ratio of 1:0.5.

[0032] The preparation method is the same as in Example 1.

Example Embodiment

[0033] Example 3

[0034] The thickening agent for water-based fracturing fluid of the present invention is composed of the following materials in parts by weight:

[0035] 20 parts of acrylamide, 7 parts of methacrylamide, 55 parts of 2-acrylamide-2-methylpropanesulfonate, 7 parts of acrylic acid, 0.5 parts of disodium ethylenediaminetetraacetic acid, 0.6 parts of sodium formate, 0.6 parts of initiator , 40 parts of deionized water; the initiator is a mixed solution of ammonium persulfate and sodium bisulfite in a weight ratio of 1:1.

[0036] The preparation method is the same as in Example 1.

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Abstract

The invention relates to a densifier for aqueous fracturing fluid and a preparation method thereof. The densifier for aqueous fracturing fluid comprises the following components in parts by weight: 15-25 parts of acrylamide, 5-10 parts of methacrylamide, 30-80 parts of sodium 2-acrylamide-2-methylacrylsulfonate, 5-10 parts of acrylic acid, 0.1-1 part of complexing agent, 0.1-1 part of chain transfer agent, 0.1-1 part of initiator, and 20-50 parts of deionized water. The densifier for aqueous fracturing fluid prepared by the method does not need purifying, and has a simple preparation technology. The densifier has good solubility and high shear resistance. The aqueous fracturing fluid prepared by the densifier has good sand carrying capacity, has less harm to the bottom layer, has no residues, and can be used as a substitute for sesbania gum and guar gum.

Description

technical field [0001] The invention relates to a thickener for water-based fracturing fluid, in particular to a thickener for water-based fracturing fluid and a preparation method. Background technique [0002] Fracturing technology is a common oil and gas stimulation technology, and its purpose is to press oil and gas layers out of fractures, thereby increasing production. Currently used fracturing fluids are mainly divided into water-based fracturing fluids, oil-based fracturing fluids, alcohol-based fracturing fluids, and foam fracturing fluids. Due to the advantages of low cost and good performance, water-based fracturing fluids are widely used in China. are widely used outside. The fracturing fluid must have the characteristics of high viscosity, high shear resistance, high sand-carrying capacity, and environmental protection without residue. The currently used thickener raw materials mainly include vegetable gum and its derivatives, cellulose derivatives, biopolysac...

Claims

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Application Information

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IPC IPC(8): C09K8/68C08F220/58C08F220/56C08F220/06
CPCC08F220/585C08F2400/02C08F2800/20C09K8/68C09K8/882C08F220/56C08F220/06
Inventor 张锐锋徐用军段百超宫居安
Owner 陕西延长石油丰源石油助剂有限公司
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