Journal
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
Volume 68, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2019.102901
Keywords
Shale oil; Shale gas; Phase behavior; Confinement; Numerical simulation
Categories
Funding
- National Natural Science Foundation of China [U1663208, 51520105005]
- National Science and Technology Major Project of China [2017ZX05009-005, 2017ZX05049-003]
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In oil field development, phase behavior would influence fluid components and mobility, thus affecting production. As a fine-grained sedimentary rock, shale brings difficulties to observing and modelling fluid behavior in similar ways to conventional reservoir experiments and simulations due to the abundance of nanometer-sized pores. Confined in nanopores, hydrocarbons exhibit largely different phase behavior in shale reservoirs. Limited experiments showed the shifts of phase envelopes, heterogeneous density profiles, and decreasing fluid viscosity. There exist controversies concerning bubblepoint deviation and critical density shift. Based on experimental observations, various computational methods are proposed to simulate phase behavior in confined spaces. These methods can be classified as either molecular simulation methods or varieties of equation of state. This article presents a review of the deviated phase behaviors of hydrocarbons in confined space and approaches to modelling them. Comparisons are made among different models. This article also proposes some promising research directions for future simulation models of shale oil and shale gas reservoirs.
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