A method for calculating the maximum value of coalbed methane adsorption based on coal rank and temperature-pressure gradient ratio

A maximum value, coal-bed gas technology, applied in the direction of calculation, instruments, measuring devices, etc., can solve problems such as not easy to use, and achieve the effect of simplicity, convenience and accuracy

Active Publication Date: 2021-12-31
XIAN SIYUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in related technologies, there are only qualitative analysis and semi-quantitative estimation of the critical depth Hc
At the same time, the semi-quantitative calculation also needs Langmuir volume (VL), Langmuir pressure (PL), adsorption temperature, vitrinite reflectance, moisture content, ash yield, vitrinite content, inertinite content and other parameters, which also makes the existing technology not easy to use
Moreover, there is no method to calculate the critical pressure Pc and the critical adsorption amount Vc, and there is no method to link the temperature-pressure gradient ratio with the maximum reflectance of vitrinite

Method used

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  • A method for calculating the maximum value of coalbed methane adsorption based on coal rank and temperature-pressure gradient ratio
  • A method for calculating the maximum value of coalbed methane adsorption based on coal rank and temperature-pressure gradient ratio
  • A method for calculating the maximum value of coalbed methane adsorption based on coal rank and temperature-pressure gradient ratio

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0044] During exploration and development, the maximum reflectance R0,max of coal vitrinite is 0.84, the geothermal gradient is 2.98℃ / hm, and the pressure gradient is 1.20MPa / hm.

[0045] The method comprises the steps of:

[0046] Calculate the temperature-pressure gradient ratio according to the geothermal gradient and pressure gradient of the coal sample

[0047] According to the maximum reflectance of vitrinite and the temperature-pressure gradient ratio of the coal sample, the critical buried depth Hc=-600 meters is calculated according to the calculation formula of the critical buried depth Hc mentioned above.

[0048] According to the maximum reflectance of vitrinite and the temperature-pressure gradient ratio of the coal sample, the critical pressure Pc=6.75 MPa is calculated according to the above formula for calculating the critical pressure Pc.

[0049] According to the maximum reflectance of vitrinite and the temperature-pressure gradient ratio of the coal sampl...

Embodiment approach 2

[0051] The vitrinite maximum reflectance R of coal obtained during exploration and development 0,max =1.58, the geothermal gradient is 2.5°C / hm, and the pressure gradient is 1.0MPa / hm.

[0052] The method comprises the steps of:

[0053] Calculate the temperature-pressure gradient ratio according to the geothermal gradient and pressure gradient of the coal sample

[0054] According to the maximum reflectance of vitrinite and the temperature-pressure gradient ratio of the coal sample, the critical buried depth Hc=-880 meters is calculated according to the calculation formula of the critical buried depth Hc mentioned above.

[0055] According to the maximum reflectance of vitrinite and the temperature-pressure gradient ratio of the coal sample, the critical pressure Pc=9.74 MPa is calculated according to the above formula for calculating the critical pressure Pc.

[0056] According to the maximum reflectance of vitrinite and temperature-pressure gradient ratio of the coal sa...

Embodiment approach 3

[0058] The vitrinite maximum reflectance R of coal obtained during exploration and development 0,max =2.3, the geothermal gradient is 2.5°C / hm, and the pressure gradient is 1.0MPa / hm.

[0059] The method comprises the steps of:

[0060] Calculate the temperature-pressure gradient ratio according to the geothermal gradient and pressure gradient of the coal sample

[0061] According to the maximum reflectance of vitrinite and the temperature-pressure gradient ratio of the coal sample, the critical buried depth Hc=-924 meters is calculated according to the above formula for calculating the critical buried depth Hc.

[0062] According to the maximum reflectance of vitrinite and the temperature-pressure gradient ratio of the coal sample, the critical pressure Pc=10.4 MPa is calculated according to the above critical pressure calculation formula.

[0063] According to the maximum reflectance of vitrinite and the temperature-pressure gradient ratio of the coal sample, the critica...

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Abstract

The present invention provides a method for calculating the maximum adsorption value of coalbed methane based on coal rank and temperature-pressure gradient ratio, the method includes the following steps: when the buried depth changes, the ratio of ground temperature change value dT to pressure change value dP is defined as temperature-pressure gradient ratio, and expressed as the maximum reflectance R using vitrinite o,max Calculate the maximum value of coalbed methane adsorption with the temperature-pressure gradient ratio, and the maximum value of coalbed methane adsorption includes at least one of critical buried depth Hc, critical pressure Pc and critical adsorption amount Vc; wherein, the maximum reflectance R of vitrinite o,max The range is between 0.65% and 2.50%; the temperature-pressure gradient ratio range is between 1.92 and 5.0: the range of ground temperature change value dT is between 2.5°C / hm and 3.5°C / hm, and the range of pressure change value dP is 0.70MPa / hm ~1.30MPa / hm. Compared with related technologies, the method for calculating the maximum adsorption value of coalbed methane based on coal rank and temperature-pressure gradient ratio provided by the present invention is simple, convenient and highly accurate.

Description

technical field [0001] The invention relates to the field of calculation methods for coalbed methane adsorption extremes, in particular to a method for calculating coalbed methane adsorption maximums based on coal ranks and temperature-pressure gradient ratios. Background technique [0002] Coal bed adsorption gas contains more than 80% of the total gas content, and the main component is methane. The adsorption capacity and adsorption characteristics of coal rock reservoirs are important basis for coal bed methane geological evaluation. In the study of coalbed methane, the Langmuir isothermal adsorption theory is mainly used to characterize its adsorption behavior, and the isothermal adsorption and desorption of coalbed methane are theoretically completely reversible. At present, coalbed methane is mainly developed and utilized according to the mechanism of "drainage-depressurization-desorption-diffusion-seepage". Therefore, the adsorption and desorption behavior characteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/00
CPCG01N30/00
Inventor 李东张学梅郝静远马青华
Owner XIAN SIYUAN UNIV
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