Cross-linkable polymer linear colloid system for shale gas fracturing and preparation method thereof

A technology of polymer and linear glue, which is applied in the field of cross-linkable polymer linear glue system and its preparation for shale gas fracturing, which can solve the problems of poor effect of linear glue base liquid and achieve high viscosity and good application prospects , Suspended sand washing effect is good

Inactive Publication Date: 2017-03-08
SICHUAN WELDON CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that the linear gum base liquid prepared in the existing low-concentration guar gum has a poor effect, the purpose of the present invention is to provide a linear gum base liquid prepared in the flowback liquid with high viscosity, cross-linking, sand washing and replacement Cross-linkable polymer linear adhesive system for shale gas fracturing with good effect and preparation method thereof

Method used

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  • Cross-linkable polymer linear colloid system for shale gas fracturing and preparation method thereof
  • Cross-linkable polymer linear colloid system for shale gas fracturing and preparation method thereof
  • Cross-linkable polymer linear colloid system for shale gas fracturing and preparation method thereof

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preparation example Construction

[0036] Next, the preparation method of the above-mentioned cross-linkable polymer linear glue system for shale gas fracturing will be described in detail. It includes the step of preparing the base liquid and the step of mixing, wherein the step of preparing the base liquid is: take the flowback liquid of the formula amount, add the thickener and stir until dissolved, then add the clay stabilizer and the drainage aid of the formula amount, mix After uniformity, the base liquid is prepared and set aside; the mixing step is as follows: during the fracturing operation, pump the cross-linking agent of the formulated amount into the mixing tank of the sand mixer truck and add it to the base liquid to obtain a polymer linear glue cross-linking system.

[0037] According to one embodiment of the present invention, in parts by weight, add 982 to 989 parts of flowback liquid into the container and start stirring, then slowly add 3 to 5 parts of thickener into the flowback liquid and sti...

Embodiment 1

[0043] Under nitrogen protection and at a temperature of 15°C, in parts by weight, 30 parts of acrylamide was dissolved in 50 parts of deionized water, and 10 parts of 2-acrylamide-2-methylpropanesulfonic acid was added under stirring conditions Slowly add the aqueous solution of potassium persulfate obtained by dissolving 0.01 part of potassium persulfate in 10 parts of deionized water while stirring, react for 4 hours to obtain the thickener aqueous solution after the completion of the dropwise addition for 30 minutes, and solidify and granulate the thickener aqueous solution Then get the thickener.

[0044] Add 10 parts of zirconium oxychloride and 5 parts of borax into 65 parts of water and stir until dissolved, then heat up to 65°C, and then add 20 parts of triethanolamine to react for 3 hours to obtain an organic boron-zirconium composite crosslinking agent.

[0045] Add 10 parts of polyquaternium and 10 parts of potassium chloride into 80 parts of water, and stir for 60...

Embodiment 2

[0051] Under the protection of nitrogen and at a temperature of 18°C, in parts by weight, 40 parts of acrylamide was dissolved in 40 parts of deionized water, and 10 parts of acrylic acid was added under stirring conditions; while stirring, slowly dropwise added 0.015 parts of over The aqueous solution of potassium persulfate obtained by dissolving potassium sulfate in 10 parts of deionized water was added dropwise for 30 minutes and reacted for 4 hours to obtain a thickener aqueous solution, which was solidified and granulated to obtain a thickener.

[0052] Add 12 parts of zirconium oxychloride and 8 parts of borax into 60 parts of water and stir until dissolved, then heat up to 65°C, and add 20 parts of citric acid to react for 3 hours to obtain the organic boron-zirconium composite crosslinking agent.

[0053] Add 10 parts of polyquaternium and 10 parts of potassium chloride into 80 parts of water, and stir for 60 minutes to obtain a clay stabilizer.

[0054] Add 12 parts ...

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Abstract

The invention discloses a cross-linkable polymer linear colloid system for shale gas fracturing and a preparation method thereof. Through being metered in parts by weight, the polymer linear colloid system comprises 0.3 to 0.5 part of thickening agents, 0.3 to 0.5 part of clay stabilizing agents, 0.3 to 0.5 part of discharge aiding agents, 0.2 to 0.3 part of crosslinking agents and 98.2 to 98.9 parts of flowback fluid. The preparation method comprises the steps of base solution preparation and mixing; the flowback fluid according to the formula ratio is taken; the thickening agents are added; stirring is performed till the dissolution; then, the clay stabilizing agents and the discharge aiding agents according to the formula ratio are added; the mixture is uniformly mixed to prepare base liquid for use; during the fracturing operation, the crosslinking agents in the formula ratio is added into the base liquid; the polymer linear colloid system is obtained. Compared with a low-concentration guar gum system with wide application in the prior art, the linear colloid base liquid prepared in the flowback fluid has the characteristics of high viscosity, crosslinking performance, low friction resistance and good sand washing replacing effect, and has good application prospects.

Description

technical field [0001] The invention relates to the technical field of large-scale volumetric fracturing reconstruction of shale gas, and more specifically relates to a cross-linkable polymer linear glue system for shale gas fracturing and a preparation method thereof. Background technique [0002] In the current shale gas fracturing technology, the linear gum fracturing fluid system used is a low-concentration guar gum system. Since shale gas construction will produce a large amount of flowback liquid, the flowback liquid is basically used for on-site liquid preparation. However, the salinity of the flowback liquid is high and the chemical composition is complex. If a linear gum base liquid is prepared with a low concentration of guar gum, the flowback liquid is prone to slow or non-sticky phenomenon, which seriously affects the linearity. Sand washing and displacement effects of rubber fracturing fluid system. [0003] Therefore, it is necessary to provide a cross-linkab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/88
CPCC09K8/685C09K8/887
Inventor 何伟王彬张灵张红旭
Owner SICHUAN WELDON CHEM
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