西南石油大学学报(自然科学版)

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Modified Isothermal Adsorption Model of Shale Gas

ZHANG Yuelei1,2,3*, LI Dahua1,2,3, WANG Qinghua4, GUO Dongxin1,2,3   

  1. 1. Key Laboratory of Shale Gas Exploration of Ministry of Land and Resources,Chongqing Institute of Geology and Mineral Resources,Yuzhong,
    Chongqing 400042,China;2. Chongqing Research Center for Shale Gas Resource & Exploration Engineering,Chongqing Institute of Geology and
    Mineral Resources,Yuzhong,Chongqing 400042,China;3. State Key Laboratory of Petroleum Resource and Prospecting,Chongqing Shalegas
    Research Center,Yuzhong,Chongqing 400042,China;4. Second Oil Production Plant in Qinghai Oilfield Company,PetroChina,Haixi,
    Qinghai 816400,China
  • Online:2016-02-01 Published:2016-02-01

Abstract:

When using Langmuir model and modified double Langmuir model on heterogeneity medium shale isotherm adsorption,
the experimental data fitting accuracy and stability is not high. We launched a study on new isotherm adsorption
equation. The study transforms the adsorption characteristics of different adsorption media within the adsorption system into
the actual effect of system pressure,and corrects the pressure for double Langmuir model,getting a new P-Langmuir isotherm
adsorption model,which is suitable for multi-adsorption-media system. The model is applied to fitting adsorption isotherm
experimental data of 21 samples of Yuye 1 shale gas well in the Southeast of Chongqing and the result shows that average errors
of Langmuir model are between -0.012 8 m3/t and 0.021 2 m3/t,D-Langmuir model between -0.003 64 m3/t and 0.021 2 m3/t,
and all the values of the correlation coefficient R2 of the P-Langmuir model are between 0.992 5 and 0.999 8,and that average
errors of 21 samples are between -0.003 25 m3/t and 0.003 21 m3/t. Compared to the Langmuir equation and double Langmuir
equation,P-Langmuir model is of higher fitting accuracy and better stability,has some practical significance for more
accurately evaluating shale gas adsorption.

Key words: shale gas, adsorption system, pressure modified, adsorption model, P-Langmuir model, Yuye 1 well

CLC Number: