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Thickener for water-based fracturing fluid and preparation method

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. The effect of low damage to the bottom layer and high shear resistance

Active Publication Date: 2016-01-20
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 cause reservoir damage
The preparation process of this method is complicated and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The water-based fracturing fluid thickener 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 Initiator 0.1 part,.

[0024] Its preparation method is as follows:

[0025] a, mixing and stirring deionized water and 2-acrylamide-2-methylpropanesulfonate;

[0026] b, adding sodium hydroxide solution to the solution prepared in step a to adjust the pH value 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 to 40 minutes under nitrogen gas at a temperature of 30° C. to 60° C.;

[0028] d. Add the mixed liquid obtained in step c to an initiator, and react for 4 to 10 hours to obtain a finished product. ...

Embodiment 2

[0030] The water-based fracturing fluid thickener 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 edetate, chain transfer 0.1 part of agent and 1 part of initiator; the initiator is a mixed solution of ammonium persulfate and sodium bisulfite with a weight ratio of 1:0.5.

[0032] Its preparation method is with embodiment 1.

Embodiment 3

[0034] The water-based fracturing fluid thickener 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 edetate, 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 with a weight ratio of 1:1.

[0036] Its preparation method is with embodiment 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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Patent Type & Authority Patents(China)
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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