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Prediction method and device of gas adsorption capacity of coal rock

A technology of gas adsorption and prediction method, applied in the direction of analyzing materials, instruments, etc., can solve the problems of monotonous change, unable to reflect the amount of adsorption, reducing characteristics, etc.

Active Publication Date: 2020-03-03
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Application Information

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Problems solved by technology

[0003] At present, the gas adsorption and desorption experiments are relatively mature, but the experimental period is long. The coal sample preparation stage needs 2 to 3 days, the first adsorption equilibrium needs 1 day, and after changing the experimental conditions, it still needs to be stable for 2 hours.
In addition, in the process of realizing the present application, the inventors of the present application found that: the existing gas adsorption and desorption theory also has some shortcomings. Pressure increase first increases and then decreases characteristic

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  • Prediction method and device of gas adsorption capacity of coal rock
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  • Prediction method and device of gas adsorption capacity of coal rock

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Embodiment Construction

[0054] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0055] refer to figure 1 As shown, the method for predicting the gas adsorption capacity of coal in the embodiment of the present application may include the following steps:

[0056] S101. Obtain the composition, ambient temperature and water saturation of the target coal rock, and determine the average pore width of the target coal roc...

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Abstract

The invention provides a method and a device for predicting gas adsorption capacity of coal petrography. The method comprises the steps of: obtaining component, environment temperature and water saturation of a target coal petrography; determining average pore width of the target coal petrography according to a preset change relation curve; obtaining bulk phase density and bulk phase chemical potential of the gas at different ambient pressures and temperatures; discretizing the average pore width of the target coal petrography into a plurality of pore intervals; determining a chemical potential caused by the fluid-solid interaction over each pore interval; substituting the chemical potential with the bulk phase chemical potential into an adsorption equilibrium criterion model; correspondingly obtaining a chemical potential caused by the fluid-fluid interaction over each pore interval; correspondingly obtaining a gas adsorption phase density over each pore interval according to the chemical potential caused by the fluid-fluid interaction over each pore interval; and obtaining the gas adsorption capacity of the target coal petrography according to gas adsorption phase density and thebulk phase density over each pore interval. According to the method and the device for predicting the gas adsorption capacity of coal petrography, the accuracy and the efficiency of prediction can beimproved.

Description

technical field [0001] This application relates to the technical field of coalbed methane exploration and development, in particular to a method and device for predicting the gas adsorption capacity of coal rocks. Background technique [0002] Coalbed methane, as an alternative energy source to conventional oil and gas resources, has become an important part of the world's energy structure. Adsorption, as the most important storage mode of gas in coal seams, has great theoretical guiding significance for evaluating the recoverability of coal seam gas and revealing the mechanism of gas-water production. [0003] At present, the gas adsorption and desorption experiments are relatively mature, but the experimental period is long. The coal sample preparation stage needs 2 to 3 days, the first adsorption equilibrium needs 1 day, and after changing the experimental conditions, it still needs to be stabilized for 2 hours. In addition, in the process of realizing the present applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N7/04
CPCG01N7/04
Inventor 曾泉树汪志明
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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