Fracturing fracture-forming technique and method for shale

Abstract

The invention relates to a fracturing fracture-forming technique and a fracturing fracture-forming method for shale. The fracturing fracture-forming method comprises the following steps: I, arranging a shale well and a pump set on the ground, wherein the shale well comprises a shaft, a shaft wall, a shaft bottom and a horizontal shaft section; an overlying rock layer and a target layer are arranged on the outer side of the shaft wall; a conveying pipeline is arranged in the shale well; a packer is connected to the other end of the conveying pipeline; a perforation channel is formed in the outer wall of the horizontal shaft section; II, arranging a microwave generation device on the ground, arranging a microwave transmission line in the shale well, arranging a pipeline column on the outer side of the transmission line, and enabling a microwave receiving device to be connected to one end of the microwave transmission line; III, arranging the pump set on the ground, arranging the conveying pipeline in the shale wheel, and arranging a ball actuated sliding sleeve structure on the conveying pipeline. By adopting the fracturing fracture-forming technique and the fracturing fracture-forming method for shale, the problem that the cost of fracturing fluid is high in the fracturing process can be solved, and meanwhile, by using a method of microwave heating in combination with liquid nitrogen cooling, the problem that a seepage channel is blocked by water-locking as liquid phase near a well pore is relatively slow in volatilization speed due to the fact that the pressure difference is too small is solved.

Description

technical field [0001] The invention relates to the field of petroleum exploration and development, in particular to a technology and method for shale fracturing and fracture creation. Background technique [0002] With the development of the energy industry, petroleum plays an increasingly important role, and the exploitation of conventional petroleum can no longer meet the needs of our industrial development and life. Therefore, the exploitation of unconventional oil and gas is getting more and more attention, especially shale gas Mining has received unprecedented attention. However, the permeability of the bottom layer of shale is extremely low, usually micro-nanometer pores, mining must be through large-scale artificial fractures (networks) to form industrial production capacity. Therefore, effective fracture network formation is a key technology for shale gas exploitation. [0003] Foreign countries, especially the United States, have used relatively advanced technolo...

AI Technical Summary

Problems solved by technology

At the same time, in the fracturing process, a large amount of even tens of thousands of cubic meters of fracturing fluid is required. The price of fracturing fluid is very expensive, which directly affects the cost of our shale gas exploitation; Clay hydration expansion, working fluid invasion, working fluid residue, working fluid additive residue, working fluid biofilm hinders gas flow, too small production pressure difference leads to slow volatilization of liquid phase near the wellbore, causing water lock to block seepage channels

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