Analysis of Mancos Shale gas production scenarios under various stress mechanisms

Document Type

Journal Article

Publication Title

Arabian Journal of Geosciences

Volume

14

Issue

18

Publisher

Springer

School

School of Engineering / Graduate Research Services

RAS ID

38785

Funders

Mehran University of Engineering and technology Edith Cowan University

Comments

Memon, K. R., Muther, T., Abbasi, G. R., Tunio, A. H., Shah, F., Mahesar, A. A., ... & Nasir, U. (2021). Analysis of Mancos Shale gas production scenarios under various stress mechanisms. Arabian Journal of Geosciences, 14(18), article 1872. https://doi.org/10.1007/s12517-021-08190-0

Abstract

Unconventional shale gas reservoir requires fracture network for exploitation from nano-Darcy shale where reservoirs have a space-to-space variation. This study is aimed to investigate the potential of Mancos Shale formation for the purpose of hydrocarbon recovery using numerical analysis of cryogenic liquid treatment. In this study, at first, the core samples of Mancos Shale from the Late Cretaceous (upper Cretaceous) geologic development were treated before and after cryogenic liquid nitrogen for different treatment times specifically 30, 60, and 90 min, respectively. Later, the numerical simulation is used to determine the overall gas production under different confining stress scenarios with different treatment times. In this study, the candidate reservoir is simulated on a simple layer cake model having a thickness 450 ft to simulate production scenarios for different ranges of permeability and porosity. The simulation results for the Mancos shale gas reservoir are obtained with net confining stress ranging from 1000 to 7000 psi. The simulation reveals that the recovery obtained before fracture treatment was 0.0004 SCTR with quite a low production. Nevertheless, an increase in the exposure time of cryogenic treatment through the liquid nitrogen LN2 process enhanced the gas recovery to a maximum level of 2.2 SCTR at confining stress of 7000 psi. Hence, simulation studies have shown that cryogenic liquid nitrogen treatment has a profound effect to increase the production of shale gas.

DOI

10.1007/s12517-021-08190-0

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