Device for increasing shale gas recovery rate by arc cylinder surface triple-combination energy-gathering fracturing

Abstract

The invention discloses a device for increasing the shale gas recovery rate by arc cylinder surface triple-combination energy-gathering fracturing. The device comprises a detonating device and a gas delivery device; the detonating device comprises a triple-combination energy-gathering device, a detonating circuit and an exploder; the triple-combination energy-gathering device comprises a left energy-gathering cover used for gathering explosive exploding energy to emit the energy to the right, a right energy-gathering cover used for gathering explosive exploding energy to emit the energy to theleft, and a middle energy-gathering cover used for gathering explosive exploding energy to emit the energy to the middle; and the left energy-gathering cover and the right energy-gathering cover arearranged to be rotating paraboloids with openings outwards, and the middle energy-gathering cover is arranged to be a cylinder surface with an opening outwards. Compared with the prior art, because ofthe energy-gathering effect of the left energy-gathering cover, the middle energy-gathering cover and the right energy-gathering cover, shale in a fracturing area can be pressed and exploded simultaneously from the three space directions of left, middle and right separately, cracks quickly penetrate to form a shale fracture zone shaped like a Chinese character ge, the superficial area the shale is increased, and therefore the analytical rate and recovery rate of shale gas are effectively increased. A spherical-crown-shaped boss further strengthens the energy-gathering effect.

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 by 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 fractur...

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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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