Transport zones of oil confined in lipophilic nanopores: a technical note
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ICCESEN 2017
Transport zones of oil confined in lipophilic nanopores: a technical note 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 Shale resource is becoming more important in the energy supply market. While the shale oil resource is widely distributed throughout the world, the study on the oil transport mechanisms through nanopores of shale reservoir is still at the starting stage. In this paper, a novel idea is proposed by dividing the oil in the nanopore into three sub-zones: the absorbed zone, transition zone, and bulk zone. In each zone, the oil viscosity is calculated independently. The governing equations for each zone are presented. Then, coupling with the boundary equations obtained from the continuum law, three analytic equations are developed. Finally, the equation for total mass flow rate of oil transport through nanopores is obtained linearly. The model presented in this paper is the eve before the birth of a continuous model, and the new model can also shed light on the simulation of oil transport in nanoscale pores, which is the basis of multi-scale shale oil simulation. Keywords Shale oil . Lipophilic nanopore . Transport modeling . A multi-zone model . Analytic equation . Continuous theory
Introduction Unconventional resources, such as heavy oil, tight oil, and shale oil, have become the hotspots in the present petroleum industry (Sun et al. 2017a, b, c, d, e, f, g). In recent years, the exploration and development of unconventional oil and gas has gradually increased (Sun et al. 2018a, b c, d, e, f, g, h, i, j, k, l, m). Different from conventional resources, which can be developed by water flooding, a series of unconventional methods, such as thermal recovery, polymer flooding, hydraulic fracturing, and surfactant 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, 102249 Beijing, People’s Republic of China
3
China University of Petroleum – Beijing, 102249 Beijing, People’s Republic of China
flooding, are adopted for certain resources (Sun et al. 2018n, o, 2019a; Yu et al. 2019; Sun et al. 2018p, 2019b, 2018q, 2017h, 2018r, s, t, 2018, u, v). In this paper, a simple but useful model is proposed for shale oil transportinnanoporesofshalereservoirs.Oneofthesalientfeatures of shale reservoir is that the formation is rich in nanoscale pores (Fathi and Akkutlu 2013). It has been revealed that the classic Darcy’ law, which has been successfully applied to conventional reservoir simulation, is no longer useful in modeling oil and gas transport performances in shale reservoirs (Monteiro and Rycroft 2012; Nie et al. 2012).
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