Measuring system and method for diffusion coefficient and isotherm adsorption/desorption curve
A technology of diffusion coefficient and isothermal adsorption, which is applied in the direction of measuring devices, surface/boundary effects, instruments, etc., can solve the problems that cannot reflect the influence, it is difficult to avoid pressure fluctuations at both ends of the core, and it cannot reflect the heterogeneity of the reservoir well, etc. problem, achieve the effect of saving equipment cost and reducing impact
Active Publication Date: 2017-08-04
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
The isothermal adsorption / desorption characteristic test mostly uses powder samples, which cannot reflect the influence of particle cementation state and stress field on the test results
Small-diameter cores are often used in the measurement of diffusion coefficient, which cannot reflect the heterogeneity of reservoir well
In addition, when the dual-gas method is used to test the diffusion coefficient, it is difficult to avoid the influence of pressure fluctuations at both ends of the core on the diffusion during the gas injection balance process of the diffusion chamber and sampling.
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[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0042] like figure 1 Shown is a specific embodiment of the test system of the diffusion coefficient and isotherm adsorption / desorption curve of the present invention. In this embodiment, the testing system includes a core holder 6 , a confining pressure assembly, two gas containers 4 and 5 , a pressure balancer 7 , a gas chromatograph 9 , a constant temperature box 8 , a pressure sensor 11 and a vacuum pump 1 . The core holder 6 is a full-diameter core holder, and after the core sample is installed, there is a volume of 20 to 40 cm at both ends of the core. 3 The cavity acts as a gas diffusion chamber. The core holder 6 is connected to the confining pressure assembly through a pipeline, and the confining pressure assembly includes a confining pressure pump 10 and a pressure sensor 13 arranged on the pipeline to collect pressure. The confinin...
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The invention discloses a test system and method for the diffusion coefficient and isothermal adsorption / desorption curve of shale gas. A gas diffusion chamber; a confining pressure assembly, connected with the core holder, used to apply confining pressure to the core to replace the formation pressure; two gas containers filled with different gases are used to supply the gas to the two ends of the core holder respectively The diffusion chamber is filled with gas; the pressure balancer is connected with the core holder to balance the pressure of the two gas diffusion chambers; the thermostat is used to keep the temperature of the core holder, the gas container and the pressure balancer constant and a collection and testing component, which is used to collect the gas at both ends of the core at different times to test the diffusion coefficient and obtain the isothermal adsorption / desorption data curve by collecting the pressure at different times. The test system saves equipment cost.
Description
technical field [0001] The invention relates to the technical field of research on the migration mechanism of shale gas, in particular to a testing system and method for the diffusion coefficient and isothermal adsorption / desorption curve of shale gas. Background technique [0002] Shale gas is natural gas extracted from shale formations. Shale gas is an important unconventional resource, and the global shale gas resource is about 456 trillion cubic meters. Among them, the shale gas resources in China's main basins and regions are about 15 trillion to 30 trillion cubic meters, which has huge development potential. [0003] The permeability of shale is extremely low, and the migration mechanism of shale gas is different from that of conventional natural gas, which has the characteristics of desorption and diffusion. The development characteristics of shale gas are closely related to the gas migration mechanism, so the study of diffusion and adsorption / desorption characteris...
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IPC IPC(8): G01N13/00G01N7/04G01N7/14
Inventor 赵春鹏伦增珉吕成远王卫红潘伟义王海涛刘华王锐周霞骆铭
Owner CHINA PETROLEUM & CHEM CORP