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Method for calculating real adsorption capacity of methane in shale based on adsorption potential theory

A theoretical calculation and adsorption potential technology, applied in the analysis of materials, instruments, etc., can solve the problems of no interaction and inability to reflect the influence of temperature, etc., and achieve the effect of reasonable and reliable results and wide application value

Active Publication Date: 2020-11-06
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

The difficulty of this method lies in the selection of the isothermal adsorption model. At present, the Langmuir isothermal adsorption model is the most widely used, but the Langmuir isothermal adsorption model assumes that the adsorption sites on the shale surface are evenly distributed, there is no interaction between the molecules of the adsorption phase, and it is a monolayer adsorption. assumptions are too ideal
In addition, the independent variable in the Langmuir isotherm adsorption model is only pressure, which cannot reflect the influence of temperature on adsorption.

Method used

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  • Method for calculating real adsorption capacity of methane in shale based on adsorption potential theory
  • Method for calculating real adsorption capacity of methane in shale based on adsorption potential theory
  • Method for calculating real adsorption capacity of methane in shale based on adsorption potential theory

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Embodiment 1

[0083] The data used in this example come from open literature (Yu Lingjie et al., 2015), and the shale samples used come from the Longmaxi Formation in the Sichuan Basin. Excess adsorption data at °C, such as figure 1 shown.

[0084] The commonly used adsorption phase methane density value combined with the Gibbs excess adsorption capacity expression was used to correct the excess adsorption capacity data, and the corrected absolute adsorption capacity was obtained:

[0085]

[0086] In the formula, V ab is the absolute adsorption capacity, cm 3 / g,V ex Using the data of excess adsorption capacity measured by experiments; ρ ad is the methane density of the adsorbed phase, cm 3 / g; ρ g is the free phase methane density, cm 3 / g. free phase methane density ρ g Obtained directly from the chemical database of the National Institute of Standards and Technology.

[0087] Determine the methane density of the adsorption phase as 0.375g / cm 3 , 0.421g / cm 3 and 0.59g / cm ...

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Abstract

The invention discloses a method for calculating the real adsorption capacity of methane in shale based on an adsorption potential theory. The method, based on a modified D-A isothermal adsorption model, by combining supercritical isothermal adsorption experiment test data, solves model parameters and adsorbed phase methane density at each temperature by adopting loop iteration and an optimal thought, so that the defects of a common Langmuir isothermal adsorption model are overcome; and the obtained model parameters and the adsorption phase methane density can enable the adsorption potential and the adsorption phase volume under each temperature and pressure to be on the same adsorption characteristic curve, the obtained adsorption phase density and the real adsorption capacity can well meet the adsorption potential theory and the optimization theory, and the obtained result is more reasonable and reliable. The method is used for calculating the real adsorption capacity of methane in shale, can also be popularized and used for calculating the real adsorption capacity of methane in adsorbents such as coal and activated carbon, and has wide application value.

Description

technical field [0001] The invention relates to the technical field of unconventional natural gas exploration and development, in particular to a method for calculating the real adsorption amount of methane in shale based on the adsorption potential theory. Background technique [0002] The adsorption data directly obtained by the isothermal adsorption experiment is the excess adsorption amount. Since the excess adsorption amount ignores the influence of the volume of the adsorption phase, the test results cannot truly reflect the adsorption capacity of shale. Especially in recent years, with the increase of test pressure in shale isothermal adsorption experiments, researchers have found that the directly measured excess adsorption data shows the characteristics of first increasing and then decreasing with the increase of pressure, and the corresponding correction work is particularly important. At present, the commonly used method is to use the density of the adsorbed phase...

Claims

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Application Information

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IPC IPC(8): G01N7/04
CPCG01N7/04
Inventor 刘香禺赵玉龙张烈辉谢军郑健张芮菡唐慧莹郭晶晶
Owner SOUTHWEST PETROLEUM UNIV
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