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Mud shale supercritical methane isothermal adsorption model based on variable density

A technology of isothermal adsorption and mud shale, which is applied in the fields of instruments, analytical materials, computational theoretical chemistry, etc., and can solve problems that have not been reported in the literature

Pending Publication Date: 2019-10-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no literature report on the method of establishing an isothermal adsorption model from the perspective of assuming that the density of the adsorbed phase changes and the volume of the adsorbed phase is stable.

Method used

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  • Mud shale supercritical methane isothermal adsorption model based on variable density
  • Mud shale supercritical methane isothermal adsorption model based on variable density
  • Mud shale supercritical methane isothermal adsorption model based on variable density

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Embodiment

[0034] During the research and development process of this method, a trial application was carried out in the shale gas formation of the Longmaxi Formation in the Sichuan Basin.

[0035] 1. Test background introduction:

[0036]The shale gas of the Silurian Longmaxi Formation in the Sichuan Basin has been commercially developed and is currently the main shale gas producing area in my country. The Silurian Longmaxi Formation is a set of deep-sea continental shelf deposits, with a large set of organic-rich mud shale layers developed. The organic-rich shale is 20-40m thick and has a maturity (Ro) of 2.26%-2.77%. In the mature stage, a large amount of methane is generated and stagnated in the mud shale formation. The mineral components in shale reservoirs are mainly quartz and clay minerals, the organic carbon content (TOC) distribution ranges from 2.78% to 4.90%, and nanoscale pores (especially organic pores) are relatively developed.

[0037] Gas content is an important basis ...

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Abstract

The invention discloses a mud shale supercritical methane isothermal adsorption model based on variable density. The method comprises the following steps of S1, determining an adsorption phase methanedensity change rule in an adsorption process; S2, determining an adsorption phase volume change rule in a methane isothermal adsorption process; S3, establishing a variable-density supercritical methane isothermal adsorption model nex=rhoabs*Va-rhog*Va=(rhof*ln(d*p-1)-rhog)*Va; S4, measuring isothermal adsorption data of a porous medium by means of a weight method or a capacity method, fitting the experiment data by means of the model, and obtaining the adsorption phase density, the absorption phase volume and the methane absolute absorption quantity at different pressure points. The mud shale supercritical methane isothermal adsorption model is suitable for fitting isothermal adsorption experiment data of supercritical methane of the porous mediums such as mud shale, and the model can realize more accurate fitting of the isothermal adsorption data. The mud shale supercritical methane isothermal adsorption model can accurately calculate the adsorption phase density change in an isothermal adsorption process and realizes more reasonable prediction for the adsorption phase volume and the absolute adsorption quantity.

Description

technical field [0001] The invention relates to a mud shale supercritical methane isothermal adsorption model based on variable density. Specifically, the model is used for the recovery of the methane adsorption phase density, the calculation of the adsorption phase volume and the absolute adsorption amount of methane in the adsorption process. Background technique [0002] Shale gas is a natural gas resource that exists in mud shale and its interlayers in an adsorbed or free state, and its main component is methane. my country's shale gas resource potential is huge, it is an important unconventional oil and gas resource, and exploration breakthroughs have been made in many blocks. Adsorbed gas accounts for about 20-85% of the total gas content of shale, especially for shale gas reservoirs under normal pressure with low pressure coefficient. The calculation of gas volume and the estimation of the ratio of adsorbed / free gas are very important, and at the same time, they are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G16C10/00G01N7/04
CPCG16C10/00G01N7/04
Inventor 肖佃师孔星星卢双舫陈方文李勃
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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