Nano coating fiber active fracturing fluid

Abstract

The invention belongs to the technical field of shale gas well fracturing increase production, and particularly relates to a nano coating fiber active fracturing fluid. The invention aims at providing a fracturing fluid system having an integrated function of swelling prevention, resistance reduction and high sand carrying capacity, which is favorable for the fracturing modification construction of shale gas reservoir. According to the technical scheme, the nano coating fiber active water fracturing fluid is formed by compounding an antiswelling agent, a resistance reducing agent, nano coating fibers and water. The invention also provides a compounding method of the nano coating fiber active water fracturing fluid. The fracturing fluid has an antiswelling and resistance reduction effect, the sand carrying performance of the fracturing fluid is improved, the deposition way is changed, and the deposition rate of a supporting agent is reduced; and the filter loss is effectively reduced, and the damage rate for the shale reservoir is low. The compounding process is simple and easy, the damage for the shale reservoir is small, and the nano coating fiber active fracturing fluid is easy to flow back.

Description

technical field [0001] The invention belongs to the technical field of shale gas well fracturing and production stimulation, and in particular relates to a nano-coated fiber active water fracturing fluid with excellent anti-swelling, drag-reducing and sand-carrying performances for shale gas well fracturing construction. Background technique [0002] According to the hydraulic fracturing experience of shale gas wells in North America and China, active water is the most used liquid during fracturing construction, and other liquids including clean fracturing fluid and fiber fracturing fluid are also used in certain applications. The main purpose of choosing the active water liquid system instead of the commonly used cross-linked fracturing fluid is to reduce the damage of the shale reservoir, increase the complexity of the fracturing fracture network and the stimulated volume, and increase the production of shale gas wells as much as possible. The active water fracturing fluid...

AI Technical Summary

Problems solved by technology

[0003] The commonly used active water fracturing fluid is generally composed of water, anti-swelling agent (commonly used potassium chloride) and drainage aid (usually a compound of surfactants, commonly used drainage aids in oil fields include D-60 and HP-8, etc.) Prepared according to a certain ratio, the active water fracturing fluid exhibits the following defects during fracturing construction: (1) high frictional resistance, which limits the construction displacement, thereby limiting the construction scale and affecting the fracturing effect; (2) The sand-carrying performance is poor, and the fractures are often not supported well, and the expected fracturing effect cannot be achieved.

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