Device for increasing recovery ratio of shale gas through circular arc cylindrical surface three-combination energy gathering fracturing

Abstract

Disclosed is a device for increasing the recovery ratio of shale gas through circular arc cylindrical surface three-combination energy gathering fracturing. The device comprises a detonating device body and a gas delivering device body. The detonating device body comprises a three-combination energy gathering device body, a detonating circuit and an exploder. The three-combination energy gatheringdevice body comprises a left energy gathering hood enabling explosive explosion energy to be gathered to be ejected rightwards, a right energy gathering hood enabling the explosive explosion energy to be gathered to be ejected leftwards, and a middle energy gathering hood enabling the explosive explosion energy to be gathered to be ejected towards the middle. The left energy gathering hood and the right energy gathering hood are rotating paraboloids with outward openings, and the middle energy gathering hood is a circular arc cylindrical surface with an outward opening. Compared with the prior art, due to the energy gathering effects of the left energy gathering hood, the middle energy gathering hood and the right energy gathering hood, shale in an explosion fracturing zone is simultaneously extruded in the left, middle and right spatial directions, cracks quickly penetrate through to form a shale breaking belt shaped like a Chinese character 'ge', thus the specific area of the shaleis increased, and the analysis rate and the recovery ratio of the shale gas are effectively increased accordingly.

Description

technical field [0001] The invention relates to a device for increasing the recovery rate of shale gas, in particular to a device for increasing the recovery rate of shale gas through three-combination energy-gathering fracturing of circular arc cylinders. Background technique [0002] Shale gas is an emerging clean energy, which has attracted much attention because of its large reserves and long mining cycle. However, shale body as a gas storage carrier has low natural porosity and low permeability, and 95% of shale gas wells need to increase the permeability of shale body by artificial fracturing in order to have industrial exploitation value. [0003] At present, artificial fracturing methods mainly include two categories: one is hydraulic fracturing method, and the other is foam fracturing method. The hydraulic fracturing method mainly achieves the purpose of fracturing the rock formation by injecting high-pressure liquid into the borehole. According to the specific fr...

AI Technical Summary

Problems solved by technology

Both the hydraulic fracturing method and the foam fracturing method have insurmountable shortcomings in the fracturing process of shale formations: first, the fracturing fluid is equipped with a large amount of chemical agents, which will cause great damage to the formation; , the leakage of fracturing fluid is relatively serious; third, the reverse flow of fracturing fluid is relatively slow

[0004] Chinese patent CN102168543B discloses a method and device for increasing the recovery rate of shale gas by means of explosion. The surrounding shale is cracked, and the gas delivery device transports the shale gas seeped from the cracked shale to the ground; the method and device have the problems of dispersion of explosive explosion energy and low utilization rate of explosive explosion energy

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