Dynamic sand-carrying fracture expansion test device for low-permeability reservoirs

Abstract

A device for dynamically testing the dynamic sand-carrying crack expansion of a low-permeability reservoir simulates the actual dynamic sand-carrying process during hydraulic fracturing in order to provide a system device for monitoring the dynamic sand-carrying crack expansion process of the low-permeability reservoir and measuring the dynamic diversion capability of the crack, and the experimental device comprises a gas supply system, an injection system, a model system, a closed pressure control system, a metering system and a backpressure control system. The device can monitor the sand-carrying crack expansion process of a propping agent in the fracturing process in real time, and also can realize the true simulation of the change of the crack diversion capability, caused by the propping agent, in the hydraulic fracturing process of the shale gas reservoir under different closed pressures and the calculation of a corresponding crack diversion capability value. The device has the advantages of strong operability, strict structure, realization of real-time monitoring of the sand-carrying crack expansion process of the propping agent in the fracturing process, and realization of accurate measurement of the true value of the crack diversion capability in the dynamic sand-carrying process.

Description

technical field [0001] The device of the present invention belongs to the technical field of unconventional energy development. In terms of setting, it can not only realize the test of the conductivity of conventional fractures, but also can test the dynamic expansion capacity of fractures in low-permeability reservoirs at different time periods through special design, and monitor the low-permeability in real time. The dynamic sand-carrying fracture expansion process of permeable reservoirs is a test device that can evaluate the dynamic sand-carrying fracture expansion ability of low-permeability reservoirs under the joint action of fracturing fluid and rock samples. Background technique [0002] Shale gas reservoirs are characterized by low porosity and low permeability, so in the process of shale gas development, hydraulic fracturing is an important measure and key means to increase shale gas production. The hydraulic fracturing technology is used to fracturing the reservo...

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Problems solved by technology

[0005] The present invention aims to provide a device for measuring the conductivity of fractures at different time periods. Since the simulation environment is closer to the on-site fracturing conditions, it can more truly reflect the actual conductivity of fractures, so as to solve the problem of measuring fractures in the prior art. The problem of inaccurate data

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