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A kind of thickener and its preparation method and application

A technology of thickener and initiator, which is applied in the field of thickener and its preparation, can solve the problem that the thickener cannot be used for fracturing fluid, etc., and meet the requirements of fracturing construction, good drag reduction performance and thickening ability Effect

Active Publication Date: 2019-03-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a thickener and its preparation method and application, which are used to solve the technical defects that the thickener in the prior art cannot be applied to fracturing fluid prepared with high salinity water

Method used

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  • A kind of thickener and its preparation method and application

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] Add a hydrophilic acrylic monomer composed of 20g acrylamide, 5g acrylic acid and 5g 2-acrylamido-2-methylpropanesulfonic acid into 70g distilled water. After the hydrophilic acrylic monomer is fully dissolved, use the mass Sodium hydroxide solution with a content of 30% adjusts the pH to about 7 to prepare a solution.

[0031] Add 2g of dimethylallyl octadecyl ammonium chloride and 1g of N-vinylpyrrolidone to the above solution, and then add 0.5g of polyethylene glycol 12000. After stirring, heat the solution to 30°C and add Blow nitrogen into the solution for 60 minutes, then add 0.08g of initiator composed of potassium persulfate and sodium bisulfite to initiate the polymerization reaction. After reacting for about 12 hours, continue to add 0.02g of initiator composed of potassium persulfate and sodium bisulfite. The polymerization reaction is initiated by the initiator. After about 1 hour of reaction, the viscosity of the reaction system increases. After the reaction i...

Embodiment 2

[0036] Add a hydrophilic acrylic monomer composed of 20g acrylamide, 5g acrylic acid and 7g 2-acrylamido-2-methylpropanesulfonic acid into 68g distilled water. After the hydrophilic acrylic monomer is fully dissolved, use the mass The sodium hydroxide solution with a content of 20% adjusts the pH to about 7 to prepare a solution.

[0037] Add 1g of dimethylallyltetradecylammonium chloride and 1g of N-vinylpyrrolidone to the above solution, and then add 1.2g of Tween 80, after stirring, heat the solution to 30°C and add it to the solution Blow in nitrogen for 80 minutes, then add 0.06g of initiator composed of ammonium persulfate and sodium bisulfite to initiate the polymerization reaction, after about 12 hours of reaction, continue to add 0.02g of initiator composed of ammonium persulfate and sodium bisulfite to initiate In the polymerization reaction, after reacting for about 2 hours, the viscosity of the reaction system increases, and the reaction is continued for 8 hours and t...

Embodiment 3

[0040] Add a hydrophilic acrylic monomer composed of 18g acrylamide, 4g acrylic acid and 8g 2-acrylamido-2-methylpropanesulfonic acid into 70g distilled water. After the hydrophilic acrylic monomer is fully dissolved, use the mass The 35% sodium hydroxide solution adjusts the pH value to about 7 to prepare a solution.

[0041] Add 1.5g of dimethylallyl octadecyl ammonium chloride and 1.5g of N-vinylpyrrolidone to the above solution, and then add 1.5g of Tween 60. After stirring, heat the solution to 40°C and add Blow nitrogen into the solution for 60 minutes, then add 0.1g of an initiator composed of potassium persulfate and sodium thiosulfate to initiate the polymerization reaction, after about 16 hours of reaction, continue to add 0.02g of potassium persulfate and sodium thiosulfate to initiate the polymerization The polymerization reaction is initiated by the initiator, and after reacting for about 0.5 hours, the viscosity of the reaction system increases. After the reaction i...

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Abstract

The invention provides a thickener and a preparation method and application thereof. The preparation method of the thickener includes the following steps that 1, 25-35 parts by weight of hydrophilic propenyl monomers are dissolved in 65-75 parts by weight of water, then the pH value is regulated, and a solution with the pH of 6.5-7.5 is obtained; 2, 1-5 parts by weight of hydrophobic monomers and 0.5-2 parts by weight of emulsifier are added into the solution, stirring is carried out, and 0.05-0.3 part by total weight of initiator is added in batches under a protective atmosphere for a polymerization reaction, wherein the hydrophilic propenyl monomers include acrylamide, acrylic acid and 2-acrylamido-2-methylpropane sulfonic acid in the weight ratio of (15-20):(4-5):(5-15). By adding the thickener in the process of preparing fracturing fluid from highly mineralized water, the fracturing fluid with a high thickening capacity can be formed, and fracturing construction requirements can be effectively met.

Description

Technical field [0001] The invention belongs to the technical field of oil and gas field exploitation, and specifically relates to a thickener and a preparation method and application thereof. Background technique [0002] Fracturing is the use of surface high-pressure pumps to squeeze fracturing fluid with higher viscosity into the oil and gas layer through the wellbore. When the speed of injecting fracturing fluid exceeds the absorption capacity of the oil and gas layer, high pressure will be formed on the oil and gas layer at the bottom of the well. When the pressure exceeds the fracture pressure of the rock near the bottom of the well, the oil and gas layer will be compressed and cracks will be generated. When the sand-carrying fluid with proppant is continuously injected into the oil and gas layer, the cracks will extend forward and be supported at the same time. After the well is shut in, the fractures are closed on the proppant, thereby forming a fluid channel with a certa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F226/02C08F226/10C08F2/30C09K8/68
Inventor 吴江朱天寿慕立俊赵振峰李宪文陆红军张矿生薛小佳李建山吕海燕李楷刘锦范华波樊凤玲
Owner PETROCHINA CO LTD
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