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Method for testing shale gas permeability

A technology of gas permeability and measurement method, which is used in the field of shale gas permeability tester and shale gas permeability measurement, which can solve the problem that the permeability of shale matrix cannot be tested, the influence of fracture permeability cannot be eliminated, and the seepage situation interference, etc.

Active Publication Date: 2015-07-08
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
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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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  • Method for testing shale gas permeability
  • Method for testing shale gas permeability
  • Method for testing shale gas permeability

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Embodiment Construction

[0031] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0032] see figure 1 , a shale gas permeability tester provided in an embodiment of the present invention, includes a gas cylinder 1, a pressure regulating valve 2, a pneumatic valve I3, a pneumatic valve II5 and a vent valve 7 connected sequentially through a sealed pipeline, and also includes a gas cylinder connected through a sealed pipeline. The pipeline is connected to the pressure sensor I4 between the pneumatic valve I3 and the pneumatic valve II5, the manual valve 8 and the model cup 9, the manual valve 8 controls the connection of the model cup 9, and a sealed pipeline is provided between the pneumatic valve II5 and the vent valve 7 The connected pressure sensor II6, temperature sensor 10 and sample cup 11, pneumatic valve II5, pressure sensor II6, vent valve 7, temperature sensor 10 and sample cup 11 are placed in t...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 何家欢郭静姝王兰生张清秀唐显贵李农吴小庆
Owner PETROCHINA CO LTD
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