Supercritical methane isothermal adsorption model considering multiple adsorption mechanisms in shale

被引：0

作者：

Liu X. ^{[1
]}

Zhang L. ^{[1
]}

Li S. ^{[2
]}

Zhang J. ^{[3
]}

Zhao Y. ^{[1
]}

Zhang R. ^{[1
]}

Guo J. ^{[1
]}

Tang H. ^{[1
]}

Zhang F. ^{[1
]}

机构：

[1] State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southxvest Petroleum University, Sichuan, Chengdu

[2] PetroChina Coalbed Methane Company Limited, Beijing

[3] PetroChina Zhejiang Oilfield Company, Zhejiang, Hangzhou

来源：

Shiyou Xuebao/Acta Petrolei Sinica | 2022年 / 43卷 / 10期

关键词：

adsorption contribution; isothermal adsorption; multiple adsorption mechanism; shale; supercritical methane;

D O I：

10.7623/syxb202210011a

中图分类号：

学科分类号：

摘要：

The research on supercritical methane isothermal adsorption model in shale is of great significance for shale gas reserve assessment, production dynamics prediction and development program preparation. Based on the supercritical methane isothermal adsorption theory and molecular dynamics simulation results, the DA-BET supercritical methane isothermal adsorption model was established considering the differences of adsorption mechanisms in different scale spaces, characterizing the methane molecule adsorption in micropores and mesopores/macro-pores by use of DA micropore filling model and BET multimolecular layer adsorption model, repectively. On this basis, the model fitting method and fitting effect were analyzed using high temperature and high pressure experimental data, and the contribution of different adsorption mechanisms to supercritical methane isothermal adsorption in shale was also explored. The results show that the DA-BET supercritical methane isothermal adsorption model can highly accurately fit the experimental data, and the adsorption characteristic curves obtained by cal-culationsatisfy the uniqueness, and the model can be used to predict the methane adsorption capacity of shale at high temperature. In the low-pressure stage, methane molecules are predominantly adsorbed by micropore filling, temperature and pressure significantly affect the contribution of different adsorption mechanisms to the total adsorption; the lower the temperature and the higher the pressure, the smaller the contribution of micropore filling adsorption to the total adsorption capacity. © 2022 Science Press. All rights reserved.

引用

页码：1487 / 1499

页数：12

共 47 条

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