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Thickener and preparation method and application thereof

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: 2017-01-04
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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  • Thickener and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add the 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 a mass The content is 30% sodium hydroxide solution to adjust the pH value to about 7 to prepare the solution.

[0031] Add 2g of dimethyl allyl octadecyl ammonium chloride and 1g of N-vinylpyrrolidone to the above solution, then add 0.5g of polyethylene glycol 12000, after stirring evenly, the solution is heated to 30°C, and Nitrogen was passed through the solution for 60 minutes, and then 0.08 g of an initiator composed of potassium persulfate and sodium bisulfite was added to initiate the polymerization reaction. After about 12 hours of reaction, 0.02 g of an initiator composed of potassium persulfate and sodium bisulfite was added. After reacting for about 1 hour, the viscosity of the reaction system increases. After continuing to react for 5 hours, coo...

Embodiment 2

[0036] Add the 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 a mass The solution is prepared by adjusting the pH value to about 7 with 20% sodium hydroxide solution.

[0037] Add 1g of dimethyl allyltetradecyl ammonium chloride and 1g of N-vinylpyrrolidone to the above solution, then add 1.2g of Tween 80, stir well, heat the solution to 30°C, and add to the solution Introduce nitrogen for 80 minutes, then add 0.06 g of an initiator composed of ammonium persulfate and sodium bisulfite to initiate the polymerization reaction, and after about 12 hours of reaction, continue to add 0.02 g of an initiator composed of ammonium persulfate and sodium bisulfite to initiate Polymerization reaction, after reacting for about 2 hours, the viscosity of the reaction system increases, continue to react for 8 hours and then cool to ro...

Embodiment 3

[0040] Add the 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 a mass Content is 35% sodium hydroxide solution to adjust the pH value to about 7 to prepare the solution.

[0041] Add 1.5g dimethyl allyl stearyl ammonium chloride and 1.5g N-vinylpyrrolidone to the above solution, then add 1.5g Tween 60, after stirring evenly, the solution is heated to 40°C, and Nitrogen was passed through the solution for 60 minutes, and then 0.1 g of an initiator composed of potassium persulfate and sodium thiosulfate was added to initiate the polymerization reaction. After about 16 hours of reaction, 0.02 g of an initiator composed of potassium persulfate and sodium thiosulfate was added. After reacting for about 0.5h, the viscosity of the reaction system increases. After continuing to react for 10h, cool to room temperature to form a...

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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 in particular relates to a thickener and its preparation method and application. Background technique [0002] Fracturing is the use of surface high-pressure pumps to squeeze fracturing fluid with high viscosity into the oil and gas layers through the wellbore. When the injection rate of fracturing fluid exceeds the absorption capacity of the oil and gas layers, a very high pressure will be formed on the oil and gas layers at the bottom of the well , when the pressure exceeds the fracture pressure of the oil and gas layer near the bottom of the well, the oil and gas layer will be opened and fractures will be formed. When the sand-carrying fluid with proppant is continuously injected into the oil and gas layer, the fracture will extend forward and be supported at the same time After the well is shut down, the fractures are closed on the proppant, thereby forming a fluid ...

Claims

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Application Information

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Patent Type & Authority Applications(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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