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Method for measuring diffusion coefficient of carbon dioxide in rock

A technology of carbon dioxide and diffusion coefficient, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of saturated formation fluid loss, affecting the identity of the experiment and the real conditions of the formation, and affecting the measurement accuracy

Active Publication Date: 2012-10-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

This type of method requires real-time sampling of the gas chambers at both ends of the rock, and then gas chromatographic analysis of the gas samples at each time point to calculate the change in gas concentration at both ends of the rock, so that the gas chambers at both ends of the rock will be analyzed at the instant of sampling. The influence of pressure, which affects the measurement accuracy
And because two gas chambers need to be installed at both ends of the rock, when it is necessary to measure the diffusion coefficient of gas in the rock saturated with formation fluid, the saturated formation fluid will be lost during the vacuuming process, which affects the relationship between the experiment and the real conditions of the formation. identity

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  • Method for measuring diffusion coefficient of carbon dioxide in rock
  • Method for measuring diffusion coefficient of carbon dioxide in rock
  • Method for measuring diffusion coefficient of carbon dioxide in rock

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Embodiment Construction

[0007] Technical scheme of the present invention is as follows:

[0008] A method for measuring the diffusion coefficient of carbon dioxide in rocks, comprising the following steps:

[0009] (1) Dry the diffusion cylinder;

[0010] (2) Use the sampling cylindrical core or the artificial cylindrical core as the filling sample rock, dry the filling sample rock, seal the upper and lower ends of the filling sample rock with sealant, and then put it into the diffusion cylinder;

[0011] (3) Vacuum the diffusion cylinder;

[0012] (4) Use the heater to heat the diffusion cylinder, keep the temperature constant until the formation pressure is simulated, and wait for use;

[0013] (5) Pump the experimental fluid into the diffusion cylinder, pressurize it to 10MPa, and perform saturated fluid treatment on the filled rock sample; the experimental fluid is the formation pore fluid or the simulated formation fluid, and the simulated formation fluid is related to the formation pores Sim...

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Abstract

The invention discloses a method for measuring diffusion coefficient of carbon dioxide in rock. In the invention, the diffusion coefficient of carbon dioxide in rock is not measured by measuring the concentration of carbon dioxide, but obtained by measuring the pressure variation of carbon dioxide gas: the concentration variation is recalculated by using a corrected carbon dioxide gas state equation, thereby determining the diffusion coefficient of carbon dioxide gas in rock. The invention basically discards gas chambers, eliminates the influence of sampling on gas pressure, and integrates the process of vacuumizing, saturated formation fluid and gas diffusion coefficient determination, thereby thoroughly eliminating the influence on saturated fluid in rock in the vacuumizing process.

Description

technical field [0001] The invention relates to a method for measuring the diffusion coefficient of carbon dioxide in rocks, belonging to the technical field of petrochemical industry. Background technique [0002] As the main greenhouse gas, carbon dioxide emission reduction has become a hot issue in the world today. Scientists have shown that geological storage is an effective way to reduce carbon dioxide emissions. However, when carbon dioxide is stored geologically, the choice of geological storage sites is particularly important. This is because on-site operators, environmental regulators, and the public all want to ensure that carbon dioxide is stored safely in geological storage, ensuring that the carbon dioxide will not exceed the predetermined boundary in the ground and will not leak into the atmosphere again. Therefore, it is particularly important to evaluate the safety of the storage site before the geological storage of carbon dioxide. [0003] When carbon dio...

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Application Information

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IPC IPC(8): G01N13/04G01N7/10
Inventor 李兆敏李松岩张超王舒华刘葳李宾飞
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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