Method for testing shale gas permeability and shale gas permeability tester

Abstract

The invention relates to a shale gas permeability tester. The shale gas permeability tester comprises a gas cylinder, a pressure regulating valve, a first pneumatic valve, a first pressure sensor, a second pneumatic valve, a second pressure sensor and an emptying valve which are sequentially connected through sealing pipelines, and the shale gas permeability tester further comprises a hand-operated valve, a model cup, a temperature sensor, a specimen cup and a thermostat. The invention further relates to a method for testing shale gas permeability. A shale core is crashed into particles with a certain shape, then the particles are placed in a thermostatic sealed container, pressure of the particles with change of time is recorded in real time after certain pressure is added in the container, and therefore the permeability of a shale base material is calculated. A test for the shale gas permeability is no longer affected by crack permeability, and the permeability of the shale base material can be accurately tested.

Description

technical field [0001] The invention relates to the field of experimental equipment and methods for measuring conventional physical parameters in oil and gas field development experiments, in particular to a method for measuring shale gas permeability and a shale gas permeability measuring instrument. Background technique [0002] Along with the demand for energy in industrial production, in order to obtain new alternative energy sources, the development of unconventional natural gas has become a hot spot worldwide. Reservoirs that were considered impermeable in the past are now finding ways to extract them. In the past, the permeability test method for ordinary reservoirs, if the conventional method is used to test the reservoirs with extremely low permeability, it will become difficult to measure due to the small flow rate. [0003] This method fails when encountering low permeability reservoirs. More importantly, due to the special rock mechanical properties of shale, s...

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Problems solved by technology

More importantly, due to the special rock mechanical properties of shale, shale cores are prone to fractures from underground to surface conditions after pressure relief. The original conventional permeability test method or the existing pressure pulse attenuation method , the influence of fractures on permeability cannot be eliminated, and the measured permeability value will be too large, so that the accurate shale matrix permeability cannot be tested, which will greatly interfere with the numerical simulation of formation seepage. error

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