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NANOPOROUS GAS TRANSPORT IN SHALE GAS RESERVOIRS
Evans Ogoun, Robert Gordon University, UK / Priscilla Ogunlude, Robert Gordon University, UK / Ofasa Abunumah, Robert Gordon University, UK /
Edward Gobina, Robert Gordon University, UK

(Presented at the International Conference on Studies in Engineering, Science and Technology (ICSEST)) which took place on October 11-14, 2021, Antalya, Turkey, https://www.2021.icsest.net/ organized by International Society for Technology, Education and Science ((ISTES)-http://www.istes.org)

High energy demand has pushed the petroleum sector into new technological advancements for the exploration and production of unconventional reservoirs. Natural gas accounts for a large percentage of this increase, this has necessitated the rapid growth in the production of shale gas reservoirs in United States of America, China, and the Middle East. In conventional gas reservoirs, gas flow is simple, uncomplicated and described by simple flux pressure drop expressions. In shale
reservoirs however, this relationship takes the form of a more complex and multiscale flow process involving special flow mechanisms (1-3). Shale gas reservoirs often contain a significant number of nanopores leading to an apparent permeability that depends on pore fluid type, pore structure and pressure differentials (4-6). The complex geometry of shale reservoirs has drastically stimulated basic research on the transport mechanisms involved in the extraction of gas from shale formations. Study of gas flow characteristics in nano pores is therefore essential to obtain parameters useful in accurate numerical modelling of these unconventional reservoirs and therefore this study is aimed at studying the gas flow in nano pores. In this paper, permeation experiments for methane flow through nanoporous membranes (pore size: 15nm, 200nm and 6000nm) at predetermined pressures of 0.2bar to 3.0bar and
thermal stability of 100o C, 150o C and 200o Cwas conducted and analyzed. Darcy equation was applied under suitable conditions to obtain the permeability. Mass transfer from the bulk gas to the membrane surface was calculated and this was compared with the permeability. The model was compared using experimental data with different gases (oxygen, methane, nitrogen and argon) and show that the model
closely matches the experimental data. Simulations involving Shale gas flowing in nano pores plays a decisive role and can be made even more accurate and reliable based on the results obtained in this work.