Rotating paraboloid energy-gathering cover for increasing shale gas recovery efficiency by fracturing method

Abstract

The invention provides a rotating paraboloid energy-gathering cover for increasing the shale gas recovery efficiency by a fracturing method. The rotating paraboloid energy-gathering cover comprises aconcave outer surface and a concave inner surface, wherein the concave outer surface and the concave inner surface are both rotating paraboloids with outward openings, and the rotating paraboloid of the concave inner surface forms a cavity. Compared with the prior art, due to the energy-gathering action of the rotating paraboloid energy-gathering cover, after explosives explode, the explosive energy is concentrated and emitted in the spatial direction perpendicular to axis rotation, shale of the explosion fracturing zone is squeezed outward, cracks cut through quickly to form a shale fracturezone, and the specific surface area of the shale is increased, so that the analytical rate and recovery efficiency of shale gas are effectively increased.

Description

Technical field [0001] The invention relates to a device for increasing the recovery rate of shale gas, in particular to a rotating parabolic energy-concentrating cover for increasing the recovery rate of shale gas in a fracturing method. Background technique [0002] Shale gas is a new type of clean energy, which has attracted much attention due to its large reserves and long mining cycle. However, the shale body as a gas storage carrier has low natural porosity and low permeability. 95% of shale gas wells need to increase the permeability of the shale body through artificial fracturing in order to have industrial exploitation value. [0003] At present, artificial fracturing methods mainly include two types: 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 fracturing process, hydra...

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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 CN103453803B discloses an energy-gathering cover for high-efficiency rock breaking. The energy-gathering cover is mainly composed of a main body with a semi-closed structure with an open end and a cavity inside it, and a flange arranged on the main body. The inner and outer surfaces of the main body are The spherical surface is mainly used to blast rocks, and the explosive energy of the energy-enhancing cover can only be concentrated in one direction, so it cannot be used to exploit shale gas by fracturing

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