Constant-pressure steady-state gas permeability measuring instrument

Abstract

The invention relates to a constant-pressure steady-state gas permeability testing instrument. The constant-pressure steady-state gas permeability testing instrument is characterized in that: a gas storage cylinder (4) is internally provided with a piston (2); the piston (2) is provided with a balancing weight block (3); the left end of a rock core holder (8) is connected with one end of a drier (7) through a pipeline while the other end of the drier (7) is connected with a gas outlet of the gas storage cylinder (8); the gas inlet of the gas storage cylinder (4) is connected with an inflator pump (1) through a pipeline; the right end of the rock core holder (8) is connected with a gas flowmeter and a soap-film gas flowmeter (13) through a pipeline; the outer wall of the rock core holder (8) is provided with a ring press hole; and the ring press hole of the rock core holder (8) is connected with a ring press pump (5) through the pipeline. Based on a steady pressure principle, the constant-pressure steady-state gas permeability testing instrument adopts an internally arranged inflator pump for inflation to stabilize inlet and outlet pressures of the rock core, so that precision and stability of the rock core test are improved, and the testing error of the rock core permeability is controlled within 1%. The constant-pressure steady-state gas permeability testing instrument, disclosed by the invention, has advantages of simple structure, convenient operation, steady performance and good repeatability.

Description

Technical field: [0001] The invention relates to a constant-pressure and steady-state gas permeability meter, which belongs to the technical field of experimental equipment for evaluation and research of petroleum exploration and development reservoirs. Background technique: [0002] The permeability of reservoir rock is defined as the ability of reservoir rock to allow fluid to pass through, which is used to measure the permeability of oil and gas layers, and is an indispensable petrophysical parameter in the process of oil and gas exploration and development and reservoir evaluation. Therefore, it is of great significance to accurately measure rock permeability. [0003] Usually what we call permeability is the absolute permeability of rock, which is mainly measured by gas permeability meter. [0004] At present, the existing gas permeability meters in the laboratory are divided into two categories: non-steady state method and steady state method. The non-steady-state me...

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Problems solved by technology

[0005] As above, both methods have serious shortcomings, and it is difficult to accurately measure the permeability of rocks

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