Shale gas downhole rock stratum hydraulic fracturing method and device thereof

Abstract

The invention discloses a shale gas downhole rock stratum hydraulic fracturing method and device thereof. The method comprises the following steps that S1, first-time hydraulic fracturing drilling isconducted on a stratum, a plurality of oil and gas producing cracks are formed in the stratum, the stratum with the first oil producing condition is formed, and oil and gas exploitation is started; S2, an oil shaft pre-monitoring system is established; and S3, the oil shaft pre-monitoring system is utilized to monitor the oil and gas yield in the stratum for pre-monitoring, the pressure, the oil and gas yield and the stratum temperature of the stratum with the first oil producing condition serve as indexes for pre-monitoring of the characteristics of an oil shaft, if the oil yield of the oil shaft is decreased and the oil well pressure is decreased, second-time hydraulic fracturing construction continues to be conducted on the stratum, and the stratum with the second oil producing condition is formed. According to the shale gas downhole rock stratum hydraulic fracturing method and device thereof, the problems that in the oil exploitation process, the stratum permeability is low, the cracks are prone to being closed, the exploitation cost is high, the efficiency is low, and the oil well yield is low are effectively solved, the working efficiency and the yield are greatly improved, the production cost is reduced, and the important application prospects and practical significance are achieved.

Description

technical field [0001] The invention relates to a method for developing shale gas from low-permeability reservoirs, in particular to a hydraulic fracturing method and equipment for downhole rock formations of shale gas. Background technique [0002] my country's shale gas development industry is developing rapidly, but shale gas is stored in low-permeability and ultra-low-permeability formations, and it is necessary to create new fractures or expand existing fractures in the underground formation to establish the flow that transports oil and gas to the wellbore path. However, the current shale gas exploitation is extremely difficult, and it is difficult to form large-scale commercial exploitation. [0003] In producing oil and gas formations, in order to form new fractures, or extend and connect existing fractures, it is necessary to inject hydraulic fracturing fluid through the wellbore into the subsurface formation at sufficient velocity and pressure to achieve production ...

AI Technical Summary

Problems solved by technology

The invention can exploit shale gas in low-permeability areas, and is simple and reasonable, easy to operate and use, and can solve the problems of low formation permeability, easy closure of fractures, high production cost, low efficiency and low oil well output in the process of oil production. , greatly improve the efficiency and output of shale gas exploitation, and reduce costs. It is a hydraulic fracturing method for shale gas downhole rock formations with important application prospects and practical significance.

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