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

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

Example Embodiment

[0028] Example 1

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

[0030] (1) Prepare mixed reaction solution: add 560g distilled water in a 3000mL beaker, add 100g monomer AAM, 30g monomer AMPS, 100g monomer ST, 150g monomer DAC, 10g monomer BNS, 50g 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 temperature of the solution at 15°C. Top blow with nitrogen for 30 minutes to deoxygenate, add initiator (add potassium persulfate 0.05g, sodium bisulfite 0.06g, azobisisobutyronitrile 0.06g, sodium formaldehyde sulfoxylate 0.05g per liter of mixed reaction solution) , Initiating free radical generation in 20 minutes;

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

Example Embodiment

[0035] Example 2

[0036] The weight percentage of each monomer and water in the reaction solution 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 into a 3000mL beaker, add 150g monomer AAM, 10g monomer AMPS, 150g monomer ST, 100g monomer DAC, 20g monomer BNS, 30g 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 temperature of the solution at 15°C. Top blow for 30 minutes to deoxygenate with nitrogen, add initiator (add 0.03g ammonium sulfate, azobisisobutylamidine hydrochloride 0.08g, azobisisobutyronitrile 0.03g, formaldehyde sulfoxylic acid per liter of mixed reaction solution Sodium hydrogen 0.08g), initiating free radical generation in 20 minutes;

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

Example Embodiment

[0042] Example 3

[0043] The weight percentage of each monomer and water in the reaction solution 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 in a 3000mL beaker, add 50g monomer AAM, 50g monomer AMPS, 100g monomer ST, 200g monomer DAC, 10g monomer BNS, and 40g 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 temperature of the solution at 15°C. Top blow for 30 minutes to deoxygenate with nitrogen and add initiator (add 0.07g of ammonium sulfate, 0.04g of azobisisobutylamidine hydrochloride, 0.07g of azobisisobutyronitrile, and formaldehyde sulfoxylate per liter of mixed reaction solution Sodium hydride 0.04g), initiate 18 minutes to generate free radicals;

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

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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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