Preparation method of drag reducer for shale gas fracturing and drag reducer for fracturing

A technology of drag reducer and air pressure, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of inability to meet the requirements of shale gas fracturing with large displacement, large flow on-line preparation, failure to meet the requirements of environmental protection, loss of Drag reduction performance and other issues, to achieve the effect of cheap production cost, high drag reduction efficiency and shear resistance, and fast dissolution speed
CN106317316AActive Publication Date: 2017-01-11CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEM CORP
Publication Date
2017-01-11

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Abstract

The invention relates to the field of shale gas exploitation, fracturing, and yield increasing, and discloses a preparation method of a drag reducer for shale gas fracturing and a drag reducer prepared by the provided preparation method. The preparation method comprises the following steps: (1) in the presence of water, mixing at least part of polymeric monomers, inorganic salts, a stabilizer and a chelating agent to obtain a mixed solution; (2) adjusting the pH of the mixed solution to 3-7; and (3) adding an initiator and residual polymeric monomers into the reaction system obtained in the step (2) to carry out reactions; wherein the weight ratio of at least part of polymeric monomers to residual polymeric monomers is 1:1-20. The shale gas fracturing drag reducer prepared by the provided preparation method has the advantages of high drag reducing efficiency, strong shearing resistant performance, low viscosity, good fluidity, quick dissolving speed, and environment-friendliness.
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Description

technical field

[0001] The invention relates to the field of shale gas exploitation and fracturing stimulation, in particular to a method for preparing a drag reducing agent for shale gas fracturing and a drag reducing agent for shale gas fracturing prepared by the method. Background technique

[0002] Shale gas resources are very rich. However, due to the low permeability of shale matrix (generally less than 1mD), the development technology is very difficult. More than 90% of shale gas wells need to be fractured to obtain ideal production.

[0003] At present, shale gas fracturing and stimulation operations often use drag-reducing water for fracturing and stimulation operations. Drag-reducing water fracturing is a fracturing operation in which a small amount of additives such as fracturing fluid drag reducers, drainage aids, and fungicides are added to water as fracturing fluid. Different from gel fracturing fluid, drag-reducing water fracturing can significantly reduce fr...

Claims

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