A slip-flow model for multi-component shale gas transport in organic nanopores
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ICCESEN 2017
A slip-flow model for multi-component shale gas transport in organic nanopores Fengrui Sun 1,2,3 & Yuedong Yao 1,2,3 & Guozhen Li 3 & Xiangfang Li 3 Received: 21 May 2018 / Accepted: 1 February 2019 # Saudi Society for Geosciences 2019
Abstract With the rapid development of shale gas resources, the accurate simulation of shale gas development process is becoming more and more important. Shale gas transport through nanopores of shale formation is the basic of shale gas development simulation. At present, the effect of impurities on methane transport through nanopores is neglected. In this paper, a novel model is presented for simulating multi-component shale gas transport through nanopores of shale formation. The effects of multi-component, slippage flow, and Knudsen diffusion are considered in the model. Results show that when the shale gas in nanopores is very thin, the Knudsen diffusion plays the dominant role over wide range of nanopore radius. While the effect of multi-component on Knudsen number and contribution degree can be neglected, both of the slippage flow rate and the Knudsen diffusion rate increase with increasing of CO2 content. Under medium pressure condition, there exists two turning points where the slippage flow and Knudsen diffusion take turns in charge of the shale gas transmission. Under high pressure condition, the slippage flow is the dominant factor over wide range of nanopore sizes. While the conductivities increase with decreasing methane content, the effect of multi-component on contribution degrees of slippage and Knudsen diffusion can be neglected. Keywords Shale gas . Nanopores . Slippage flow . Knudsen diffusion . Multi-component effect . Analytic model
Introduction Unconventional oil and gas resources are becoming more and more important in today’s energy supply (Sun et al. 2017a, b, c, d, e, f, g; 2018a ).With the rapid development This article is part of the Topical Collection on Geo-Resources-EarthEnvironmental Sciences * Fengrui Sun [email protected] * Yuedong Yao [email protected] * Guozhen Li [email protected] 1
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum – Beijing, Beijing 102249, People’s Republic of China
2
College of Petroleum Engineering, China University of Petroleum – Beijing, Beijing 102249, People’s Republic of China
3
China University of Petroleum – Beijing, Beijing 102249, People’s Republic of China
of shale gas resources, it becomes more and more important to simulate the shale gas transport mechanisms under nanoscales in shale formation (Gao et al. 2014; Sondergeld et al. 2010; Sun et al. 2019b; Ma et al. 2014). The shale reservoirs are rich in nanoscale pores and fractures, the size of which ranges from several nanometers to dozens of nanometers, as shown in Fig. 1 (Sondergeld et al. 2010; Loucks et al. 2009; Curtis et al. 2012). The transport mechanisms of shale gas through nanoscale pores are fundamental in shale gas simulation, and it is important to the production of dynamic predictions as
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