Diffusion coefficient and isothermal adsorption/desorption curve test system and method

A technology of diffusion coefficient and isothermal adsorption, 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: 2015-09-09
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 he

Method used

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  • Diffusion coefficient and isothermal adsorption/desorption curve test system and method
  • Diffusion coefficient and isothermal adsorption/desorption curve test system and method

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0042] Such as 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 confi...

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Abstract

The invention discloses a test system and method for the diffusion coefficient and isothermal adsorption/desorption curve of shale gas. The test system includes: a core holder, the to-be-tested core contained at the center of which separates two ends into two gas diffusion chambers; a confining pressure component, which is connected to the core holder to load confining pressure to the core to replace the formation pressure; two gas containers loaded with different gases to inflate the gas diffusion chambers at two ends of the core holder respectively; a pressure balancer, which is connected to the core holder to balance the pressure of the two gas diffusion chambers; a constant temperature box, which is used for keeping the temperature of the core holder, the gas containers and the pressure balancer constant; and an acquisition and test component, which is used for collecting the gas at both ends of the core at different time so as to test the diffusion coefficient and collecting the pressure at different time to obtain the isothermal adsorption/desorption data curve. The test system saves the 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...

Claims

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Application Information

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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
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