Device and method for simultaneously testing permeability of compact rocks under transient state and steady state
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A technology of tight rock and permeability, which can be used in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc.
Active Publication Date: 2014-08-06
NORTHEASTERN UNIV
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[0012] 1. The pore structure of tight rock has a great influence on its permeability, and the test methods, principles and physical quantities of the transient permeability of tight rock are different. How to accurately measure the tight rock pore structure without changing the tight rock pore structure Permeability by method
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Embodiment 1
[0120] Such as figure 1 As shown, the device for simultaneously testing the permeability of tight rock in a transient steady state of the present invention includes a triaxial pressure chamber, a bias control system, a confining pressure control system, an upper end permeation system, a lower end permeation system, a vacuum system, a differential pressure sensor, Constant temperature system and data control acquisition system.
[0121] The triaxial pressure chamber includes an axial pressure chamber 18, a confining pressure chamber 24, a self-balancing piston 19, a ball head 20, an upper pressure head 25, a spring-type axial displacement sensor 27, a chain-type circumferential displacement sensor 22, and a lower pressure platform 30. The porous gasket 26 and the sample heating device; the axial pressure chamber 18 is set above the confining pressure chamber 24, connected by a self-balancing piston 19, and connected to one end of the confining pressure chamber 24 extending from...
Embodiment 2
[0169] The test device for simultaneously testing the permeability of tight rock in the transient steady state of Example 1, the method for simultaneously testing the permeability of gas-bearing shale in the transient steady state, the specific steps are:
[0170] Step 1. Calibrate the reference volume
test approach 6
[0172] Scheme 6: The test gas is helium, and the porosity of the gas-bearing shale is greater than 5%. The mode of constant volume at the upper end and constant volume at the lower end is adopted. The upper end permeation system uses the first container 10 and the second container 11, and the lower end permeation system selects the second container 12. The fourth container 13;
[0173] (2), fix the first temperature sensor 28 on the surface of the sample close to the standard steel sample, place the porous gasket 26 on the upper and lower ends of the standard steel sample, and place it between the upper pressure head 25 and the lower pressure platform 30; The center of the standard steel sample is aligned with the center of the upper pressure head 25 and the lower pressure platform 30, and the outside is covered with a thermoplastic tube for isolation and sealing; all shut-off valves of the test device are closed.
[0174] (3), open the first cut-off valve V1 and the second cu...
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Abstract
The invention relates to a device and a method for simultaneously testing the permeability of compact rocks under transient state and steady state, and belongs to the fields of rock engineering and unconventional oil and gas reservoir engineering. The testing device for simultaneously testing the permeability of the compact rocks under the transient state and the steady state comprises a three-shaft pressure chamber, a bias pressure control system, a confining pressure control system, an upper end permeating system, a lower end permeating system, a vacuum pumping system, a constant temperature system and a data controlling and collecting system. The method for simultaneously testing the permeability of the compact rocks under the transient state and the steady state comprises the following steps: demarcating the reference volume, providing the confining pressure and bias pressure temperature environment for a sample, and testing the permeability under the transient state and the permeability under the steady state. For the device and the method, the practical bias pressure, back pressure and constant temperature testing environment conforming to the engineering is provided, the fluctuation error of the temperature can be controlled within -0.1 DEG C to +0.1 DEG C, the volume error of the gas can be controlled within 0.3%, and the error of the injected pressure can be controlled within 0.5%. The test of the permeability under the transient state in constant pressure and constant volume ways can be simultaneously realized; when the permeability is tested in the constant volume way, the volume of a reference container can be adjusted according to the volume of a pore.
Description
technical field [0001] The invention belongs to the fields of rock engineering and unconventional oil and gas reservoir engineering, and particularly relates to a device and method for simultaneously testing tight rock permeability in a transient steady state. Background technique [0002] With the decline of conventional oil and gas reserves, the exploration and development of unconventional oil and gas resources, as an important strategic supplementary energy source, restricts the rapid development of China's future economy. my country's unconventional oil and gas reservoir resources mainly include shale gas, tight sandstone gas, coalbed methane and deep tight oil and gas reservoirs. Among them, shale gas reserves exceed conventional natural gas reserves, and tight sandstone gas and coalbed gas reserves are equivalent to shale gas reserves. The Twelfth Five-Year Plan clearly requires that shale gas production reach 6.5 billion cubic meters in 2015. However, due to the lack...
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