Shale permeability testing device and method based on liquid pressure pulses in presence of ultrasonic waves

Abstract

The invention discloses a shale permeability testing device based on liquid pressure pulses in the presence of ultrasonic waves. The shale permeability testing device comprises a constant-pressure constant-current pump (1), a vacuum pump (2), a core holding unit (11), an upstream standard room (6) and a downstream standard room (15), wherein the upstream standard room (6) communicates with the liquid inlet end of the core holding unit (11); the downstream standard room (15) communicates with the liquid outlet end of the core holding unit (11); both the upstream standard room (6) and the downstream standard room (15) are connected with pressure sensors (17). The invention further discloses a testing method. The shale permeability testing device and method have the beneficial effects that a rapid shale permeability measuring experiment is realized in the presence of the ultrasonic waves, and a shale permeability changing process is simulated under the action of different ultrasonic wave power; evaluation of the influence degree of the ultrasonic waves on the shale seepage characteristic is realized by observing the difference among pulse attenuation curves generated by making standard saline pass through a shale core to be measured.

Description

technical field [0001] The invention relates to the field of physical property measurement and evaluation of tight oil and gas reservoirs, in particular to a shale permeability testing device and method based on liquid pressure pulse under the action of ultrasonic waves. Background technique [0002] In the 1950s and 1960s, the United States and the former Soviet Union took the lead in using ultrasonic technology to improve the permeability of oil and gas reservoirs, and proved that ultrasonic waves can promote oil and gas seepage. Since then, some scholars at home and abroad have conducted detailed studies on the seepage behavior of porous media under the action of ultrasonic waves, and found that the permeability of porous media such as sandstone and coal rocks has been significantly improved under the action of ultrasonic waves. In recent years, with the great success of shale gas exploitation in the United States, shale gas, an unconventional oil and gas resource, has re...

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Problems solved by technology

[0004] The invention solves the problem that the existing pressure pulse experiment device cannot perform the permeability test of shale core under the

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