Impact of fluid adsorption on geomechanical properties of shale gas reservoir and shale gas recovery rate

Yan Peng, Hongyan Qu, Jishan Liu, Zhejun Pan, Keliu Wu, Xiaohu Dong, Zhouyuan Zhu

Research output: Chapter in Book/Conference paperConference paper

Abstract

Shale gas reservoirs comprise of various minerals like clay and organic matters. After hydraulic fracturing, large number of water together with CH4 remains in reservoirs. In this case, fluid adsorption is one of obvious fluid-shale interactions and affects geomechanical properties of shale which are important for shale gas production. In this paper, experimental observations of shale property change due to fluid adsorption were illustrated and discussed. It was suggested that those experimental observations result from the internal strain between different minerals and microcracks initiation inside shale. Based on the poroelastic theory and rock damage theory, models of Young's modulus and permeability were established to consider effects of those physical processes. Those models were verified by over ten groups of experimental results. Meanwhile, an experimental method was proposed to identify the impact of gas adsorption on permeability. Finally, the impact of fluid adsorption on recovery rate of shale gas reservoirs was analysed through numerical simulations. The results illustrate that the fluid adsorption strongly affect the recovery rate, and indicate that those factors need to be seriously considered for shale gas production design.

Original languageEnglish
Title of host publicationProceedings of the 52nd U.S. Rock Mechanics/Geomechanics Symposium
PublisherAmerican Rock Mechanics Association (ARMA)
Publication statusPublished - 1 Jan 2018
Event52nd U.S. Rock Mechanics/Geomechanics Symposium - Seattle, United States
Duration: 17 Jun 201820 Jun 2018
http://armasymposium.org/

Conference

Conference52nd U.S. Rock Mechanics/Geomechanics Symposium
CountryUnited States
CitySeattle
Period17/06/1820/06/18
Internet address

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Peng, Y., Qu, H., Liu, J., Pan, Z., Wu, K., Dong, X., & Zhu, Z. (2018). Impact of fluid adsorption on geomechanical properties of shale gas reservoir and shale gas recovery rate. In Proceedings of the 52nd U.S. Rock Mechanics/Geomechanics Symposium American Rock Mechanics Association (ARMA).