An improved Langmuir model for evaluating methane adsorption capacity in shale under various pressures and temperatures

Ye, Zhihui; Chen, Dong; Pan, Zhejun; Zhang, Guangqing; Xia, Yang; Ding, Xiang

doi:10.1016/j.jngse.2016.03.070

Cited by 73 publications

(56 citation statements)

References 20 publications

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“…The temperature dependence of adsorption capacity is greatly controlled by the isosteric heat which also depends on the surface coverage. Many experimental studies have been conducted on the influence of temperature on adsorbed shale gas content (3,6,(11)(12)(13)(14)(15)(16)(17)(18) According to Guo et al (4), adsorbed gas content increased with increasing pressure under isothermal conditions whereas the gas content decreased under isobaric conditions for increases in temperature. Guo et al (4) obtained adsorption isotherms at different temperatures and also at different pressure points for shale samples of the Ordos Basin, China.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Temperature-Dependent Gas Adsorption Models and Their Application to Shale Gas Reservoirs

2018

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Significant quantities of gas are adsorbed onto the rock matrix in shale gas reservoirs. Accounting for this adsorbed gas in reservoir calculations is key for realistic estimations of gas in place, overall gas production and later as a target for enhanced gas recovery methods like thermal stimulation. Classical Langmuir isotherm fails to represent gas adsorption at multiple temperatures thereby making its application in thermal stimulation strategies limited. In this work, several temperature-dependent gas adsorption models were reviewed and grouped further into both temperature dependent and independent Langmuir volume. Application of the models to several shale gas data sets obtained from different regions show minimal differences in the successful prediction of gas adsorption using either the temperature dependent or independent Langmuir volume models. However, caution is to be exercised in the choice of

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Section: Introductionmentioning

confidence: 99%

Comparison of Temperature-Dependent Gas Adsorption Models and Their Application to Shale Gas Reservoirs

2018

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“…The model, therefore, is suitable for non-homogeneous adsorbents especially in the Devonian shale where two mineral composition of clay and kerogen are said to be mainly responsible for gas storage. Ye et al. (2016) also proposed a variation of the classical Langmuir isotherm equation by introducing an exponential relation that expresses the Langmuir volume (VL) as dependent on temperature.…”

Section: Methodsmentioning

confidence: 99%

Application of temperature-dependent adsorption models in material balance calculations for unconventional gas reservoirs

Fianu

Gholinezhad

Hassan

2019

Heliyon

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Langmuir isotherm is the most common adsorption model used in the prediction of gas adsorption in most shale and coal bed methane reservoirs. However, due to the underlying assumption of single temperature, it fails to model gas adsorption where temperature differential exists in the reservoir. To address this shortcoming, temperature-dependent gas adsorption models have been incorporated into material balance calculations for accurate prediction of original gas in place as well as determining both average reservoir pressure and future performance in coal/shale gas reservoirs. The material balance equation has been expressed as a straight line with both Bi-Langmuir and Exponential models used in prediction of gas adsorption rather than the Langmuir isotherm. With this methodology, several adsorption capacities can be obtained at multiple temperatures which will allow for better estimation of original gas in place and future gas production. The results from this works show that temperature-dependent gas adsorption models can be used in place of Langmuir isotherm to account for the effect of temperature variations and more accurate representation of the adsorption of gas in coal/shale gas reservoirs.

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“…10 0 10 1 CpD = 0.5 0.7 0.9 1.0 10 2 10 3 10 5 10 4 Fig. 17 Dimensionless plot with the effect of the shape factor (Ye et al 2016) 5 Comparison of different pressure transient analysis models…”

Section: Field Applicationsmentioning

confidence: 99%

A review of pressure transient analysis in reservoirs with natural fractures, vugs and/or caves

et al. 2020

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A review of the pressure transient analysis of flow in reservoirs having natural fractures, vugs and/or caves is presented to provide an insight into how much knowledge has been acquired about this phenomenon and to highlight the gaps still open for further research. A comparison-based approach is adopted which involved the review of works by several authors and identifying the limiting assumptions, model restrictions and applicability. Pressure transient analysis provides information to aid the identification of important features of reservoirs. It also provides an explanation to complex reservoir pressure-dependent variations which have led to improved understanding and optimization of the reservoir dynamics. Pressure transient analysis techniques, however, have limitations as not all its models find application in naturally fractured and vuggy reservoirs as the flow dynamics differ considerably. Pollard’s model presented in 1953 provided the foundation for existing pressure transient analysis in these types of reservoirs, and since then, several authors have modified this basic model and come up with more accurate models to characterize the dynamic pressure behavior in reservoirs with natural fractures, vugs and/or caves, with most having inherent limitations. This paper summarizes what has been done, what knowledge is considered established and the gaps left to be researched on.

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An improved Langmuir model for evaluating methane adsorption capacity in shale under various pressures and temperatures

Cited by 73 publications

References 20 publications

Comparison of Temperature-Dependent Gas Adsorption Models and Their Application to Shale Gas Reservoirs

Comparison of Temperature-Dependent Gas Adsorption Models and Their Application to Shale Gas Reservoirs

Application of temperature-dependent adsorption models in material balance calculations for unconventional gas reservoirs

A review of pressure transient analysis in reservoirs with natural fractures, vugs and/or caves

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