Slippery water for shale gas fracturing and preparation method thereof

A technology of slick water and air pressure, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of a large number of organic solvents, complex technology, high production cost, etc., and achieve good friction reduction effect, good compatibility and low cost low effect

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, this method requires a large amount of organic solvent, the production cost is slightly higher, and the technology is more complicated

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  • Slippery water for shale gas fracturing and preparation method thereof

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Embodiment Construction

[0020] 1. Composition of slick water formula: emulsion drag reducer 0.15%, clay stabilizer 0.3%, drainage aid 0.3%, potassium chloride 1.0%, fungicide 0.05%. The drag reducing agent is an emulsion-type drag reducing agent synthesized by an inverse emulsion polymerization process, which is a copolymer of acrylamide, 2-acrylamidodimethylpropanesulfonic acid, glycidyl methacrylate and acrylic acid, and is an anionic Type polyacrylamide, its viscosity-average molecular mass is 8.5 million, and its intrinsic viscosity is 1810mL·g -1 The clay stabilizer is a quaternary ammonium salt type cationic copolymer synthesized by epichlorohydrin, dimethylamine and ethylenediamine; the drainage aid is an aqueous solution of anionic fluorocarbon surfactant and methanol; the The fungicide is formaldehyde.

[0021] 2. Preparation of slippery water:

[0022] According to the above composition, weigh the required clear water, accurately weigh and record the types and amounts of each additive;

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Abstract

The invention provides slippery water for shale gas fracturing. The slippery water is prepared from the ingredients in percentage by weight: 0.08-0.3wt% of an emulsion friction reducer, 0.3-1.0wt% of a clay stabilizer, 0.3-1.0wt% of a discharge aiding agent, 0.5-2.0wt% of potassium chloride, 0.05-1.0wt% of a bactericide and the balance of water. Specifically, the emulsion friction reducer is an anionic polyacrylamide copolymer, is prepared through taking acrylamide as a main body structural unit, adding an ionic structural unit and a functional monomer and copolymerizing, and has the viscosity-averaged relative molecular mass of 6-9 millions and the intrinsic viscosity of 1,600-1,860mL/g. According to the slippery water provided by the invention, the used additives are high in dissolution rate and uniform in dispersion, and during field application, the on-line preparation of the slippery water can be realized by using continuous preparing or in an on-line preparing device, so that the technical requirements of a shale gas reservoir on high-displacement (10-20m<3>/min) and high-liquid-volume (10,000-50,000m<3>) fracturing construction are met.

Description

technical field [0001] The invention belongs to the field of petroleum engineering, and in particular relates to the formula composition, preparation method and main performance evaluation of slick water fracturing fluid used in large-scale fracturing reconstruction of shale gas. Background technique [0002] my country's shale gas fracturing is still in the exploratory stage. The slick water fracturing fluid used in the early stage is mainly the technology provided by foreign oil service companies. There are few reports on the slick water fracturing fluid system with excellent performance in China, especially suitable for shale gas fracturing. The development and evaluation of additives such as drag reducers, clay stabilizers, and surfactants for rock gas fracturing have just started. [0003] However, the slick water system provided by foreign companies is mainly developed for the fracturing of shallow shale gas reservoirs in the United States, and the direct copying and ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/605C09K8/608C09K8/68C09K8/882C09K2208/28
Inventor 路保平王宝峰蒋廷学黄静贾长贵赵晓魏娟明刘建坤王海涛卫然李双明
Owner CHINA PETROLEUM & CHEM CORP
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