Method and device for measuring breakthrough pressure of porous medium material

Abstract

The invention discloses a method and a device for measuring a breakthrough pressure of a porous medium material. The method comprises the following steps of: A, placing a saturated infiltration phase tested piece into a holder, and loading a confining stress to the tested piece; B, shutting off an upstream emptying valve, a downstream emptying valve and a backpressure emptying valve, and vacuumizing; C, when the device is in a stable vacuum state, making the device pass through an upstream non-infiltration phase injection system and a downstream infiltration phase injection system; and D, simultaneously performing test on the breakthrough pressure and the permeability coefficient. The holder is connected with a confining stress control valve through a pipeline; the upstream is connected with an upstream control valve and an upstream pressure meter through pipelines; the downstream is connected with a downstream control valve, a downstream pressure meter and a backpressure control valve respectively through pipelines; a communicating valve is connected with an upstream non-infiltration phase and a downstream infiltration phase respectively through pipelines; a data acquisition cardis connected with the upstream pressure meter through a data wire. The invention is easy in operation, stable in performance and reliable in measurement, and applicable to simultaneous, quick, efficient and precise measurement of the breakthrough pressure and the permeability coefficient of the porous medium material.

Description

Technical field [0001] The invention relates to the technical field of measurement of breakthrough pressure of rock-like porous media materials, and more specifically to a method for simultaneous measurement of breakthrough pressure and permeability coefficient of porous media materials integrated with multiple methods, and also relates to a porous media material integrated with multiple methods The device for simultaneous measurement of breakthrough pressure and permeability coefficient is suitable for a wide range of rock-like porous media materials using different methods (including stepwise method, continuous method, transient method) to perform multiple parameters (including breakthrough pressure, permeability coefficient) at the same time, Fast, wide, accurate and efficient measurement. Background technique [0002] With the demand and development of deep mining and safety evaluation projects for industrial projects such as natural gas and coal-bed methane, and in recent ye...

AI Technical Summary

Problems solved by technology

In the case of limited experimental time, the breakthrough pressure value measured by the traditional experimental method is often too large, which is not realistic, because in the traditional experiment, if the applied pressure is equal to or slightly greater than the breakthrough pressure (minimum capillary force) of the test piece, due to the gas drive Replacing the liquid in the tested piece is an extremely slow process, and the amount of liquid discharged is very small, so it is difficult to observe the breakthrough of the gas; if the breakthrough of the gas is to be observed in a short time, the pressure required for the experiment (that is, the breakthrough Pressure) must be far greater than the capillary pressure of the largest connected pore in the tested piece, resulting in a large error in the test results. In addition, due to the inevitable slight differences in the length of the tested piece during the experiment, the same tested piece obtained multiple The breakthrough pressure value causes large errors in the test results, so it is not accurate and rigorous enough to measure the breakthrough pressure to evaluate the cap rock by traditional methods

[0005] In order to overcome the shortcomings and shortcomings of traditional breakthrough pressure measurement methods and devices that cannot quickly and accurately measure the breakthrough pressure of low-permeability porous media materials, it is necessary to design a method that uses a transient method to measure the breakthrough pressure of porous media materials quickly, broadly, accurately and efficiently. The method and device are used to solve the technical problem of rapid and accurate measurement of the breakthrough pressure of low-permeability cap rocks, and provide a test method and technical support for the study of cap rock sealing performance and the evaluation of related industrial projects

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