Clean fracturing fluid thickening agent and preparation method thereof

A technology for cleaning fracturing fluids and thickeners, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as inability to maintain clay stability, poor thermal stability of thickeners, cracks that cannot reach width and depth, etc. , to achieve the effect of good shear resistance, good dispersion of thickener and short liquid preparation time

Inactive Publication Date: 2014-12-24
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thermal stability of the thickener is poor, and the clay cannot be kept stable, so that the cracks created cannot reach the required width and depth

Method used

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  • Clean fracturing fluid thickening agent and preparation method thereof
  • Clean fracturing fluid thickening agent and preparation method thereof
  • Clean fracturing fluid thickening agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The weight percentage of each monomer and water in the reaction liquid is: AAM:AMPS:ST:DAC:BNS:NVP:water=10:3:10:15:1:5:56.

[0030] (1) Prepare mixed reaction solution: add 560g of distilled water to a 3000mL beaker, add 100g of monomer AAM, 30g of monomer AMPS, 100g of monomer ST, 150g of monomer DAC, 10g of monomer BNS, 50g of monomer NVP, and stir until completely dissolved ;

[0031] (2) Adjust the pH value of the mixed reaction solution to pH=8 with sodium hydroxide, and maintain the solution temperature at 15°C. Nitrogen deoxygenation by top blowing for 30 minutes, adding initiator (0.05 g of potassium persulfate, 0.06 g of sodium bisulfite, 0.06 g of azobisisobutyronitrile, and 0.05 g of sodium formaldehyde sulfoxylate are added to the mixed reaction solution) , causing 20 minutes to generate free radicals;

[0032] (3) Raise the temperature to room temperature, heat it with microwave method on medium heat (500W) for 2 minutes to mix it evenly, then take it ou...

Embodiment 2

[0036] The weight percentage of each monomer and water in the reaction liquid is: AAM:AMPS:ST:DAC:BNS:NVP:water=15:1:15:10:2:3:54.

[0037] (1) Prepare mixed reaction solution: add 540g of distilled water to a 3000mL beaker, add 150g of monomer AAM, 10g of monomer AMPS, 150g of monomer ST, 100g of monomer DAC, 20g of monomer BNS, 30g of monomer NVP, and stir until completely dissolved ;

[0038] (2) Adjust the pH value of the mixed reaction solution to pH=9 with sodium hydroxide, and maintain the solution temperature at 15°C. Nitrogen deoxygenation by top blowing for 30 minutes, adding initiator (adding ammonium sulfate 0.03g, azobisisobutylamidine hydrochloride 0.08g, azobisisobutyronitrile 0.03g, formaldehyde sulfoxylate in every liter of mixed reaction liquid Sodium hydrogen 0.08g), trigger 20 minutes to produce free radicals;

[0039] (3) Raise the temperature to room temperature, heat it with medium heat (500W) by the microwave method for 3 minutes, mix it evenly, then ...

Embodiment 3

[0043] The weight percentage of each monomer and water in the reaction liquid is: AAM:AMPS:ST:DAC:BNS:NVP:water=5:5:10:20:1:4:55.

[0044] (1) Prepare mixed reaction solution: add 550g of distilled water into a 3000mL beaker, add 50g of monomer AAM, 50g of monomer AMPS, 100g of monomer ST, 200g of monomer DAC, 10g of monomer BNS, and 40g of monomer NVP, and stir until completely dissolved;

[0045] (2) Adjust the pH value of the mixed reaction solution to pH=8 with sodium hydroxide, and maintain the solution temperature at 15°C. Nitrogen deoxygenation by top blowing for 30 minutes, adding initiator (adding ammonium sulfate 0.07g, azobisisobutylamidine hydrochloride 0.04g, azobisisobutyronitrile 0.07g, formaldehyde sulfoxylate in every liter of mixed reaction liquid Sodium hydrogen 0.04g), trigger 18 minutes to produce free radicals;

[0046] (3) Raise the temperature to room temperature, heat it with microwave method on medium heat (500W) for 2 minutes to mix it evenly, then ...

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Abstract

The invention discloses a clean fracturing fluid thickening agent and a preparation method thereof. The thickening agent is prepared by mixing methacrylamide, 2-acrylamide-2-methyl-1-moropholino ethanesulfonic acid salt, styrene, acryloyloxyethyl trimethyl ammonium chloride, sodium p-styrenesulfonate and N-vinyl-pyrrolidone in solvent water, adjusting the pH value of mixed reaction liquid to be 8-9, adding an initiator for initiating a free radical under the protection of nitrogen and then performing polymerization according to a microwave method. The clean fracturing fluid thickening agent has the advantages of high shearing resistance, high viscosity, high carrying property and the like; furthermore, the clean fracturing fluid thickening agent is short in liquid mixing time, high in dispersion property and high in swelling speed, and can realize simultaneously liquid mixing and construction.

Description

technical field [0001] The invention belongs to the technical field of fracturing of conventional oil and gas reservoirs and unconventional oil and gas reservoirs, and in particular relates to a clean fracturing fluid thickener and a preparation method thereof. Background technique [0002] Fracturing stimulation technology is one of the most effective production stimulation technologies in the process of oil and gas reservoir exploitation. Currently, the thickeners used in fracturing are mainly plant gums and their derivatives, which have the disadvantages of slow water dissolution, high insoluble content, and after gel breaking. There are many residues and damage to the reservoir. In addition, the traditional fracturing process has problems such as long preparation time and environmental pollution caused by residual fluid discharge. In particular, preparation and construction are carried out in two steps successively, which cannot achieve real-time matching between the two...

Claims

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Application Information

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IPC IPC(8): C08F220/34C08F220/56C08F220/58C08F212/08C08F212/14C08F226/10C09K8/68
Inventor 刘音党伟牛增前常青马洪芬何志勇李洪俊
Owner CNPC BOHAI DRILLING ENG
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