Inverse emulsion polymer thickener for fracturing fluid and preparation method thereof

An inverse emulsion and fracturing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of inconvenient use, poor temperature resistance, slow dispersion speed, etc., and achieve fast dispersion speed and high speed. Sand-carrying, easy-to-prepare effect

Active Publication Date: 2013-06-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a fracturing fluid for overcoming the problems of poor temperature resistance, slow dispersion speed, difficult preparation, intolerant to shearing, large dosage, poor stability and inconvenient use in the prior art. Inverse emulsion polymer thickener; meanwhile, it is to provide a preparation method of the above-mentioned inverse emulsion polymer thickener for fracturing fluid

Method used

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  • Inverse emulsion polymer thickener for fracturing fluid and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] Add 130kg of water to the reaction kettle, start stirring and add mass fraction 120kg50% 2-acrylamido-2-methylpropanesulfonate sodium solution, 5kg N,N-dimethylacrylamide, 40kg acrylamide, 5kg methacrylic acid Acyloxyethyltrimethylammonium chloride, 0.0075kg N, N-methylenebisacrylamide, 2kg Tween-80 emulsifier, 0.015kg ethylenediaminetetraacetic acid disodium salt, stirred until completely dissolved, and then used 30% sodium hydroxide adjusted the pH of the system to be 7.5 to obtain the water phase; add 155kg of white oil, 3kg of isooctyl acrylate and 10kg of Span-80 emulsifier in the reactor, and stir until fully dissolved to obtain the oil phase; Slowly add the water phase to the oil phase, stir for 30 minutes, and emulsify at high speed for 20 minutes to obtain a monomer compound emulsion; put the above emulsion into the reaction kettle, turn on the mixer, raise the temperature to 50°C, and pass nitrogen for 15 to 30 minutes. Add 0.05kg sodium bisulfite, 0.1kg potas...

Embodiment 2

[0026] Add 145kg of water to the reaction kettle, start stirring and add 30kg of 50% 2-acrylamido-2-methylpropanesulfonate sodium solution, 10kg of N,N-dimethylacrylamide, 75kg of acrylamide, and 15kg of methacrylamide Acyloxyethyltrimethylammonium chloride, 0.001kg N, N-methylenebisacrylamide, 6kg Tween-80 emulsifier, 0.005kg ethylenediaminetetraacetic acid disodium salt, stirred until completely dissolved, and then used 30% sodium hydroxide regulates the pH of the system to be 9 to obtain the water phase; add 115kg of white oil and 0.5kg of stearyl acrylate and 15kg of Span-80 emulsifier in the reactor, stir until fully dissolved to obtain the oil phase; Slowly add the water phase into the oil phase under certain conditions, stir for 30 minutes, and emulsify at high speed for 20 minutes to obtain a monomer compound emulsion. Put the above emulsion into the reaction kettle, turn on the mixer, raise the temperature to 35°C, pass nitrogen for 15-30 minutes, then add 0.15kg sodi...

Embodiment 3

[0028] Add 145kg of water to the reaction kettle, start stirring and add mass fraction 60kg50% 2-acrylamido-2-methylpropanesulfonate sodium solution, 15kg N,N-dimethylacrylamide, 75kg acrylamide, 10kg methacrylamide Acyloxyethyltrimethylammonium chloride, 0.005kg N, N-methylenebisacrylamide, 3.5kg Tween-80 emulsifier, 0.01kg ethylenediaminetetraacetic acid disodium salt, stirred until completely dissolved, then Regulate the system pH with 30% sodium hydroxide to be 9 to obtain the water phase; add 125kg white oil, 0.75kg cetyl acrylate and 14kg Span-80 emulsifier in the reactor, stir until fully dissolved to obtain the oil phase; Slowly add the water phase to the oil phase under stirring conditions, stir for 30 minutes, and emulsify at high speed for 20 minutes to obtain a monomer compound emulsion; put the above emulsion into the reaction kettle, turn on the mixer, heat up to 40°C, and pass nitrogen for 15-30 Minutes, add 0.1kg sodium thiosulfate, 0.12kg ammonium persulfate, ...

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Abstract

The invention relates to an inverse emulsion polymer thickener for a fracturing fluid and a preparation method thereof. The thickener is polymerized by water, 2-acrylamidyl-2-methyl sodium proparesulfonic acid liquid with mass fraction of 50%, alkyl acrylamide, acrylamide, a cationic monomer, N, N-methylene bisacrylamide, a tween-80 emulsifier, ethylene diamine tetraacetic acid disodium salt, 30% sodium hydroxide, white oil, acrylic ester, a span-80 emulsifier, sulfite, a peroxysulphate initiator, a water-soluble azo initiator and OP-15. According to the invention, raw materials are industrial products, and purification is not needed before reaction; polymerization is initiated by initiators by adding a complexing agent, and the preparation process is simple; the thickener provided by the invention is fast in dispersing, easy to prepare, free from pollution and harm, small in use level and good in stability, in particular resists high temperature of 220 DEG C, and is suitable for fracturing a high-temperature stratum; and the thickener is higher in shear resistance, can meet the fracturing construction of high flow, has high sand carrying performance, and is free from residue and is not harmful to the reservoir.

Description

Technical field: [0001] The invention relates to an inverse emulsion polymer thickener for fracturing fluid and a preparation method thereof, and belongs to the technical field of preparation methods for synthesizing water-soluble polymer materials in oilfields. technical background: [0002] The purpose of fracturing is to force the reservoir out of fractures, thereby increasing production. The fracturing fluid used in fracturing must have the characteristics of high viscosity, high shear resistance, high sand-carrying strength, and environmental protection without residue after breaking the gel. High viscosity allows it to create cracks, and only high viscosity can make cracks reach the required width and depth. Thickener is the main additive in water-based fracturing fluid, which is used to increase the viscosity of fracturing fluid, reduce fluid loss, suspend and carry proppant. effects are important. [0003] With the continuous development of oil extraction technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C08F220/58C08F220/54C08F220/56C08F220/34C08F222/38C08F220/18C08F2/32
Inventor 王中华
Owner CHINA PETROLEUM & CHEM CORP
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