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A kind of fracturing fluid and preparation method thereof

A fracturing fluid and thickener technology, applied in the field of fracturing fluid, can solve the problems of poor temperature resistance and shear resistance, complex additive components, high residue content, etc., and achieve good temperature resistance and shear resistance, thickener The effect of small dosage and low residue content

Active Publication Date: 2019-10-25
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 overcome the high price of guar gum fracturing fluid in the prior art, which is difficult to purchase, the pure synthetic fracturing fluid is difficult to dissolve, has poor temperature resistance and shear resistance, and is difficult to biodegrade, and partially modified cellulose fracturing fluid Due to the defects of large amount of liquid thickener, high residue content, complex additive components, and high cost, it is possible to provide a press with cheap and easy-to-obtain raw materials, small amount of thickener, good temperature resistance and shear resistance, thorough gel breaking, and low residue content. Fracture fluid, and preparation method of the fracturing fluid

Method used

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  • A kind of fracturing fluid and preparation method thereof
  • A kind of fracturing fluid and preparation method thereof

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preparation example Construction

[0031] In the present invention, the preparation method of the organic zirconium mixture preferably includes: reacting zirconium oxychloride, glycerin, sodium lactate, sodium hydroxide and water at 50-70°C for 4-6h, wherein, zirconium oxychloride, glycerin The weight ratio of alcohol, sodium lactate, sodium hydroxide and water is preferably 1:0.4-0.7:0.8-1:0.5-0.8:1.2-1.6.

[0032] In the present invention, the gel breaker can adopt various gel breakers commonly used in the art, preferably at least one of ammonium persulfate, sodium persulfate, potassium persulfate and capsule gel breakers.

[0033] In a second aspect, the present invention provides a method for preparing fracturing fluid, the method comprising:

[0034] (1) Under stirring, add thickener I and thickener II to the water, then add clay stabilizer, bactericide, pH regulator, stir evenly to obtain the original glue solution, and then let it stand for 3-5h;

[0035] (2) Add gel breaker, then add crosslinking agent...

Embodiment 1

[0044] This example is used to illustrate the fracturing fluid of the present invention and its preparation method.

[0045] Add 0.4 parts by weight of nonionic polyacrylamide (purchased from Beijing Hengju, with a viscosity average molecular weight of 6 million) and 0.2 parts by weight of hydroxyethyl carboxymethylcellulose (purchased from Beijing Hengju) to 98.11 parts by weight of water under stirring at 5000 rpm Hubei Xiangtai Cellulose Co., Ltd., viscosity of 1% by weight aqueous solution: 60000mPa.s, degree of substitution: hydroxyethyl MS=1.8, carboxymethyl DS=0.2), then add 0.5 parts by weight of potassium chloride, 0.15 parts by weight of Formaldehyde and 0.06 parts by weight of hydrochloric acid (concentration is 37% by weight, parts by weight are calculated as HCl), stirred for 40 minutes to obtain the original glue solution, and then left to swell for 4 hours.

[0046] Take 99.42 parts by weight of the swollen original rubber solution and add 0.5 parts by weight of...

Embodiment 2

[0049] This example is used to illustrate the fracturing fluid of the present invention and its preparation method.

[0050] Add 0.27 parts by weight of nonionic polyacrylamide (purchased from Beijing Hengju, with a viscosity average molecular weight of 10 million) and 0.225 parts by weight of hydroxyethyl carboxymethylcellulose (purchased from Beijing Hengju) to 98.145 parts by weight of water under 4000rpm stirring Guangzhou Jinhua Chemical Technology Co., Ltd., viscosity of 1% by weight aqueous solution: 40000mPa.s, degree of substitution: hydroxyethyl MS=1.5, carboxymethyl DS=0.4), then add 0.8 parts by weight of ammonium chloride, 0.1 parts by weight of The sulfuric acid of glutaraldehyde, 0.02 weight part (concentration is 98 weight %, weight part is H 2 SO 4 meter), stirred for 20min to obtain the original gum solution, and then left to swell for 3h.

[0051] Take 99.56 parts by weight of the original rubber solution after swelling and add 0.4 parts by weight of an or...

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Abstract

The invention relates to a fracturing fluid, which includes a densifier I, a densifier II, a clay stabilizer, a bactericide, a pH conditioning agent, a cross-linking agent, a gel breaker and water, wherein the densifier I is nonionic polyacrylamide, and the densifier II is hydroxyethyl carboxymethyl cellulose. The invention further relates to a preparation method of the fracturing fluid. The preparation method includes: (1) during stirring, adding the densifier I and the densifier II to water, then adding the clay stabilizer, the bactericide, and the pH conditioning agent, performing uniform stirring to obtain an original glue solution, and performing standing for 3-5 h; and (2) adding the gel breaker, and then adding the cross-linking agent to obtain the fracturing fluid. The densifier I is nonionic polyacrylamide, and the densifier II is hydroxyethyl carboxymethyl cellulose. Since the fracturing fluid includes two densifiers of nonionic polyacrylamide and hydroxyethyl carboxymethyl cellulose, the fracturing fluid is small in densifier consumption, good in temperature-resistant shearing resistance, complete in gel breaking, low in residue content, cheap and available in raw materials, and low in cost.

Description

technical field [0001] The invention relates to a fracturing fluid and a preparation method of the fracturing fluid. Background technique [0002] Fracturing is to use pressure to open the formation, form fractures and support it with proppant to reduce fluid flow resistance and increase production and injection measures. It is mainly used in low-permeability oil and gas reservoirs and carbonate oil and gas reservoirs. Water-based fracturing fluid is a working fluid used in fracturing construction. It is a heterogeneous and unstable chemical system formed by a variety of additives in a certain ratio. It can increase the conductivity of the wellbore and increase the productivity of oil and gas wells. role. The necessary conditions for the application of fracturing fluids are high viscosity, low frictional resistance, less fluid loss, less residue, less damage to the formation, easy preparation, wide source of materials, and low cost. Polymer thickener is the main additive o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/605C09K8/607C09K8/685C09K8/887
Inventor 高敏李财富侯研博余伟发
Owner CHINA PETROLEUM & CHEM CORP
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