Problems of methane isothermal adsorption calculation in shale and method improvement

FANG Fan; SUN Chong; SHU Xiangwei; ZHU Zhongyun; FANG Zihe

doi:10.11781/sysydz201801071

Volume 40 Issue 1

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FANG Fan, SUN Chong, SHU Xiangwei, ZHU Zhongyun, FANG Zihe. Problems of methane isothermal adsorption calculation in shale and method improvement[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(1): 71-77. doi: 10.11781/sysydz201801071

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FANG Fan, SUN Chong, SHU Xiangwei, ZHU Zhongyun, FANG Zihe. Problems of methane isothermal adsorption calculation in shale and method improvement[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2018, 40(1): 71-77. doi: 10.11781/sysydz201801071

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Problems of methane isothermal adsorption calculation in shale and method improvement

doi: 10.11781/sysydz201801071

1.
Research Institute of Petroleum Exploration and Development, SINOPEC Jianghan Oilfield Company, Wuhan, Hubei 430223, China
2. College of Geoscience, Yangtze University, Wuhan, Hubei 430100, China

Received Date: 2017-10-30
Rev Recd Date: 2017-11-20
Publish Date: 2018-01-28

Abstract

Abstract

The studies of isothermal adsorption of methane in shale are the basis for shale gas exploration. Some achievements have been made recently. However, a substantial proportion of the in-lab experiment curves are abnormal, and even drop down, indicating for adsorption amount decrease under high pressure. Some reasons were found based on the studies of isothermal adsorption curves, including improper calculation and simulation methods. For example, the difference between absolute and excess adsorption amounts and the influence of adsorption phase volume might be ignored. What's more, some improper methods were applied for measuring methane free volume, and equipment error also existed. A ternary Langmuir model was built based on the Langmuir isothermal adsorption equation, which took methane free volume as an unknown parameter while adsorption phase density was fixed. Free volume, Langmuir volume and Langmuir pressure were calculated with iterative method or Matlab software. Methane free volume calculated with the ternary Langmuir model has a good comparability with Helium. The simulation results obtained by this method can better correct the previous curve anomalies.
- adsorption curve,
- adsorption phase density,
- free volume,
- ternary Langmuir model,
- methane,
- shale reservoir

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References

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