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

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