Device for testing gas seepage and creepage coupling action of rocks

Abstract

The invention provides a device for testing gas seepage and creepage coupling action of rocks. The device comprises an upper seat, a lower seat, a motor oil pump, a high-pressure nitrogen cylinder and an oil pump, wherein the upper seat is connected with the lower seat; a gas cavity with honeycomb-shaped gas holes is connected to each of the upper seat and the lower seat; the gas cavity which is provided with the honeycomb-shaped gas holes and connected with the upper seat is connected with an outlet pipe; the gas cavity which is provided with the honeycomb-shaped gas holes and connected with the lower seat is connected with a gas inlet pipe; the lower seat and the gas cavity which is provided with the honeycomb-shaped gas holes and connected with the lower seat are connected with a carrying plate; the carrying plate is connected with a loading oil cylinder through a pressurization piston rod; the motor oil pump is connected with the loading oil cylinder; the high-pressure nitrogen cylinder is connected with the gas inlet pipe; and the oil pump is connected with the oil cylinder and a triaxial cavity. The device can be used for performing a gas seepage and creepage coupling test on the rocks under different stress levels and different gas seepage pressures, so that the creepage test for a rock sample can be finished successfully under constant stress; and data is real and reliable.

Description

technical field [0001] The invention relates to a test device, in particular to a rock gas seepage-creep coupling test device. Background technique [0002] Rock permeability and creep are of great significance to rock engineering, engineering hydrogeology, and engineering geophysics. Creep is one of the important mechanical properties of rock. With the rapid development of my country's economy, large-scale rock engineering is becoming more and more diverse and complex. It is necessary to conduct more in-depth research on the creep properties of rock under various complex conditions. At present, my country's implementation and planning of oil (natural gas) underground energy storage, low-permeability oil and gas field development, high gas mine gas drainage, radioactive waste geological deep burial and other projects all involve the construction of underground projects in complex geological structures. These projects all involve the problem of gas seepage in rock medium, and...

AI Technical Summary

Problems solved by technology

[0004] Due to the compressibility of gas and the strong adsorption of gas, the seepage law of gas in rock is different from that of incompressible or slightly compressible liquid (such as water), and the test device for rock water seepage-creep coupling is not suitable. Study on rock gas seepage-creep coupling effect

However, because the existing gas seepage test device cannot consider the long-term creep effect of rock samples, the obtained rock permeability coefficient cannot reflect the change of rock permeability coefficient during the creep process of the surrounding rock.

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