Resistance-reducing agent used for reusable slippery water fracturing fluid and preparation method thereof

Abstract

The invention provides a resistance-reducing agent used for reusable slippery water fracturing fluid. The resistance-reducing agent comprises the following components in parts by weight: 25-30 parts of inorganic salt, 10-20 parts of a dispersant, 2-8 parts of a cation monomer, 18-32 parts of a nonionic monomer, 0.0002-0.0005 parts of an initiator. The invention also provides a preparation method of the resistance-reducing agent and an application of the resistance-reducing agent in shale gas fracturing fluid construction. The resistance-reducing agent is a water-in-water emulsion type, keeps excellent resistance-reducing and dissolving performances of the traditional emulsion-type polyacrylamide resistance-reducing agents, can avoid massive usage of an organic solvent during a production process, can greatly reduce the production cost, and can effectively reduce the reservoir damage and environment risk during fracturing construction.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploitation, and relates to a drag reducing agent for slick water fracturing fluid and a preparation method thereof. The drag reducing agent is especially suitable for shale gas fracturing construction. Background technique [0002] With the depletion of conventional oil and gas resources, the development of unconventional oil and gas resources has attracted more and more attention worldwide, and people urgently need to find suitable replacement resources. According to the forecast and statistics of the World Oil and Gas Magazine in 2009, the world's shale gas reserves are about 4.6×10 14 m 3 , the amount of resources is very rich. [0003] Shale gas reservoirs have ultra-low permeability, large thickness, and well-developed natural fractures, requiring hydraulic fracturing to achieve industrial exploitation value. Although the conventional vegetable gum fracturing fluid syst...

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Problems solved by technology

However, a large amount of organic solvents (oil phase) are used in the synthesis process, which not only causes the production cost of the product to increase, but also easily causes environmental pollution and potential safety hazards.

In addition, the addition of oil-phase substances in the slick water fracturing fluid tends to form emulsified droplets in the reservoir and stay in the pore throat, causing the "Jiamin effect" to affect the flowback of the fracturing fluid, thus causing serious reservoir damage

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