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Synthesis of thickening agent for methanol-based fracturing fluid

A methanol-based, thickening agent technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of low viscosity retention, poor shear resistance, poor temperature resistance, etc., and achieve dissolution speed Fast, good temperature and shear resistance

Inactive Publication Date: 2015-04-01
北京希涛技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alcohol-based fracturing thickeners are generally cationic polyacrylamide and non-ionic polyacrylamide. The existing problems are poor shear resistance and low viscosity retention rate; poor temperature resistance, generally not exceeding 85°C; Dispersion and dissolution in alcohol is slow, usually about 3 hours

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The weight percent of each monomer and water: AM: DMC: AN: AMPS: DMAM: H 2 O=5:25:3:3:3:61.

[0023] Solution preparation: Add 610g of distilled water into a 2000ml beaker, add 50g of AM monomer, add 250g of DMC monomer, 30g of AN monomer, add 30g of AMPS monomer, add 30g of DMAM monomer, stir and dissolve for 30 minutes, under stirring conditions Slowly add neutralizer (sodium hydroxide) to pH 6.5. The stirring solution was continued to ripen for 30 minutes.

[0024] Solution adjustment: adjust the pH value to 6.5±0.5 again, and adjust the temperature to 15±1°C.

[0025] Polymerization of the solution: Blow nitrogen to remove oxygen for 20 minutes, add catalysts V650.5g / L, V500.05g / L, ammonium persulfate 0.03g / L, sodium formaldehyde sulfoxylate 0.03g / L sequentially under nitrogen protection, stop Blow nitrogen and seal the polymerization tank, induce for 15-20 minutes, and observe whether there is a temperature rise. When there is a temperature rise of 2°C during th...

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PUM

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Abstract

At present, more than 90 percent of fracturing fluids used in the fracturing improvement of oil and gas fields are water-based fracturing fluids with water as dispersion medium, and as a result, for gas reservoirs with low formation pressure, low permeability and strong water-locking characteristic, particularly highly water-sensitive gas reservoirs, the difficulty of fluid flowback can be easily caused because the formation pressure coefficient is greatly smaller than the pressure coefficient of water in a shaft; and formation pores can be easily blocked due to the water-locking effect of formations to cause the failure of fracturing improvement. Because low-molecular weight alcohol, particularly methanol, has a lot of excellent physical and chemical properties, the low-molecular weight alcohol can be used in the improvement of low-pressure, water-sensitive formations for stimulation, and compared with conventional water-based fracturing fluids, methanol-based fracturing fluid has the characteristics of low surface tension, good water-solubility, low freezing point, high steam, high compatibility with formation rocks and the like. The invention relates to a thickening agent for methanol-based fracturing fluid, which is used in the fracturing stimulation process of natural gas wells or oil wells; because methanol and water can be formed into any proportions of mixtures, the methanol-based fracturing fluid can absorb the water constrained by water-locking formations to the maximum limit after entering the formations, and moreover, as the fracturing fluid is drained out of the ground, the water locking of the formations is released, which is favorable for the flowback of the fluid.

Description

technical field [0001] The invention relates to an additive for a methanol-based fracturing fluid used in stimulation of low-pressure and water-sensitive formations, in particular to a method for synthesizing a methanol-based fracturing fluid thickener. Background technique [0002] At present, more than 90% of the fracturing fluids used in gas field fracturing are water-based fracturing fluids with water as the dispersion medium. It is a highly water-sensitive gas layer. Because the formation pressure coefficient is much lower than the pressure coefficient of water in the wellbore, it is easy to cause difficulty in liquid flowback; due to the water locking effect of the formation, it is easy to cause blockage of formation pores and make fracturing stimulation invalid. The development and invention of a fracturing fluid used in the fracturing and stimulation process of natural gas wells is of great significance to the stimulation of gas wells in China. Non-water-based fract...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/82
Inventor 郝春玲唐富刚
Owner 北京希涛技术开发有限公司
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