A kind of multifunctional suspended concentrated fracturing fluid and its preparation method

A technology of suspension concentration and fracturing fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., to achieve the effects of improving fracturing construction efficiency, reducing chemical storage tanks and dosing pipelines, and simplifying the preparation process

Active Publication Date: 2022-06-21
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of the existing suspension-concentrated fracturing fluid, and provide a novel multifunctional suspension-concentrated fracturing fluid and its preparation method, that is, on the basis of the relatively simple preparation process of the suspension concentrate, by introducing Modified polyacrylamide with special functional groups and surfactants with viscosity increasing and demulsification and drainage functions, and synergistic effect with dispersant, so that the prepared suspension concentrate has high solid content, efficient viscosity increasing, and high sand ratio , drag reduction, demulsification and drainage, anti-swelling and other functions

Method used

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  • A kind of multifunctional suspended concentrated fracturing fluid and its preparation method
  • A kind of multifunctional suspended concentrated fracturing fluid and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0021] Under the conditions of rotating speed of 300r / min and temperature of 40℃, white oil, organic bentonite and Span 80 were added to the reaction kettle in turn, and after stirring for 1 hour, modified polyacrylamide and sodium dodecyl sulfonate were added to the reaction In the kettle, the multifunctional suspension concentrated fracturing fluid A was prepared after stirring for 1 hour.

[0022] In the above suspension concentrated fracturing fluid

[0023] White oil accounts for 50% of the total mass;

[0024] Organic bentonite accounts for 2% of the total mass;

[0025] Span 80 accounts for 2% of the total mass;

[0026] Modified polyacrylamide accounts for 45% of the total mass;

[0027] Sodium dodecyl sulfonate accounts for 1% of the total mass;

[0028] The modified polyacrylamide is prepared by copolymerization of 67% acrylamide, 20% 2-acrylamide-2-methylpropanesulfonic acid and 13% dimethyldiallyl ammonium chloride. obtained, the molecular weight is 25 million...

Embodiment 2

[0031] Under the conditions of rotating speed of 300r / min and temperature of 40℃, diesel oil, organic bentonite and Op-10 were added to the reaction kettle in turn, and after stirring for 1 hour, modified polyacrylamide and sodium tetradecyl sulfonate were added to the reaction kettle in turn. , the multifunctional suspension concentrated fracturing fluid B was prepared after continuous stirring for 1 h.

[0032] In the above suspension concentrated fracturing fluid

[0033] Diesel accounted for 49% of the total mass;

[0034] Organic bentonite accounts for 4% of the total mass;

[0035] Op-10 accounts for 1.5% of the total mass;

[0036] Modified polyacrylamide accounts for 44% of the total mass;

[0037] Sodium tetradecyl sulfonate accounts for 1.5% of the total mass;

[0038] The modified polyacrylamide is obtained by the copolymerization of 73% acrylamide, 11% acryloyl morpholine and 16% trimethylallyl ammonium chloride, with a molecular weight of 22 million and a part...

Embodiment 3

[0041] Under the condition of rotating speed of 300r / min and temperature of 40℃, kerosene, organic bentonite and Tween 60 were added to the reaction kettle in turn, and after stirring for 1 hour, modified polyacrylamide and sodium hexadecyl sulfonate were added to the reaction kettle in turn. , the multifunctional suspension concentrated fracturing fluid C was prepared after continuing to stir for 1 h.

[0042] In the above suspension concentrated fracturing fluid

[0043] Kerosene accounts for 48% of the total mass;

[0044]Organic bentonite accounts for 3% of the total mass;

[0045] Tween 60 accounts for 2% of the total mass;

[0046] Modified polyacrylamide accounts for 46% of the total mass;

[0047] Sodium cetyl sulfonate accounts for 1% of the total mass;

[0048] The modified polyacrylamide is obtained by the copolymerization of 65% acrylamide and acrylic acid, 12% 2-vinylpyridine and 23% acryloyloxyethyltrimethyl ammonium chloride, and has a molecular weight of 20...

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Abstract

The invention discloses a multifunctional suspended concentrated fracturing fluid and a preparation method thereof. The suspension-concentrated fracturing fluid of the present invention comprises the following components by weight ratio: 30-55% of modified polyacrylamide, 1-5% of drainage-aiding surfactant, 1-5% of viscosifying surfactant, 1-5% dispersant, 40-60% oil phase. The preparation method of the suspension-concentrated fracturing fluid of the present invention is prepared by adding the above-mentioned components in a certain order, and stirring together for 2 hours under the conditions of a rotating speed of 300r / min and a temperature of 40°C. The suspended concentrated fracturing fluid of the present invention has multiple functions such as high-efficiency viscosity increase, drag reduction, demulsification and drainage, anti-swelling, high sand ratio, etc., and it is not necessary to add demulsification and drainage agent and clay when used in oilfield fracturing construction sites. Additives such as stabilizers simplify construction procedures, reduce costs and improve construction efficiency.

Description

technical field [0001] The invention relates to the technical field of fracturing and stimulation of low-permeability oil and gas resources, and more particularly, to a multifunctional suspension concentrated fracturing fluid and a preparation method thereof. Background technique [0002] In the process of oil and gas field development, fracturing has become an indispensable part of improving the reserves and increasing production. At present, the fracturing construction process is generally to first prepare the base fluid in batches, disperse the dry powder of the thickener in water, fully swell within a certain period of time to form a base fluid with a certain viscosity, and then mix the base fluid with the crosslinking agent, drainage aid, clay Stabilizers, etc. are mixed to form fracturing fluid for fracturing construction. Different from the traditional liquid dispensing method, the continuous blending technology is a method of dispensing liquid according to real-time...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C09K8/88
CPCC09K8/68C09K8/88
Inventor 滕大勇范友泉闫利刚曾从良张卓丁秋炜张昕周柄男张宇王素芳
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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