Simulation experiment device for influence of hydrofracture on aquifer permeability coefficient

Abstract

The invention relates to a simulation experiment device for influence of hydrofracture on an aquifer permeability coefficient. The device comprises a shale simulation device and a shaft simulation device, wherein the shaft simulation device is arranged in the shale simulation device; the shale simulation device is hermetically connected with a contact position at the upper end of the shaft simulation device; a water inlet is formed in the upper end of the shaft simulation device; a drain outlet is formed in the side wall at the upper end of the shaft simulation device; a pressure sensor is further arranged on the side wall of the shale simulation device. The device provided by the invention can realize a simulation experiment for the influence of the hydrofracture on the aquifer permeability coefficient to acquire pressure changes of a simulation reservoir and an overlying aquifer in a hydrofracture process in real time and calculate and acquire different lithologic permeability coefficient changes under the condition of variable pressures. A solute is injected into the shaft simulation device, the pressure changes of the simulation reservoir and the overlying aquifer are monitored in a simulation fracturing fluid injecting process, and the solute concentration at a water outlet is acquired to simulate a coupling condition of a pressure field, a seepage field and a chemical field.

Description

technical field [0001] The invention belongs to the technical field of indoor simulation experiments for shale gas development, and in particular relates to a simulation experiment device for the influence of hydraulic fracturing on the permeability coefficient of aquifers. Background technique [0002] At present, the development of shale gas is inseparable from the hydraulic fracturing of well pipes. The hydraulic fracturing process can greatly increase the contact area between the well pipe and the reservoir, greatly improving the production efficiency. For the indoor simulated seepage research of shale reservoirs, it is currently limited to the microscopic seepage study of the core volume, but there is no macroscopic study of the fluid seepage during the hydraulic fracturing process. At the same time, the hydraulic fracturing process and the The subsequent changes in the permeability coefficient are not involved. [0003] In this professional field, the indoor simulate...

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Problems solved by technology

[0003] In this professional field, the indoor simulated seepage experiments involved in the pressure field situation are only related to the pressure analysis of the core seepage change related experiments, but for the seepage field simulation when the macroscopic pressure field exists, it does not involve Related indoor experiments

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