Low permeability reservoir acidizing low frequency pulsating hydraulic fracturing generating device

Abstract

The application relates to a low-frequency pulsating hydraulic fracturing device for low-permeability reservoir acidification, which comprises a cylinder assembly with a hollow cylindrical structure, a piston arranged in the cavity of the cylinder assembly, the piston being in a whole conical frustum structure, the upper end of the piston being a closed end and vertically provided with a row of pressure relief holes, the lower end being an open end, a flow guide channel being arranged in the piston and extending along the axial direction of the piston, the two ends of the flow guide channel being in communication with the open end and the pressure relief holes respectively, a supporting seat and a plug arranged on the supporting seat, the supporting seat also being arranged in the cavity of the cylinder assembly and located at the lower end of the piston, the plug being in a conical body structure and timely contacting with the flow guide channel, a plurality of flow guide holes being uniformly arranged along the circumferential direction of the supporting seat, and a reset member being sleeved on the plug. The application has the advantages of simple structure and full mechanical driving, and can effectively improve the hydraulic fracturing effect of low-permeability reservoir acidification.

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