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多孔介质期刊
影响因子: 1.49 5年影响因子: 1.159 SJR: 0.504 SNIP: 0.671 CiteScore™: 1.58

ISSN 打印: 1091-028X
ISSN 在线: 1934-0508

多孔介质期刊

DOI: 10.1615/JPorMedia.2019019718
pages 321-342

INCORPORATING GRAVITY DRAINAGE AND REIMBIBITION MECHANISMS IN TRADITIONAL MATERIAL BALANCE EQUATION FOR FRACTURED OIL RESERVOIRS: MATHEMATICAL MODELING AND SIMULATION ANALYSIS

Negin Rahmati
Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, Iran.
Mohammad Reza Rasaei
Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, Iran
Farshid Torabi
Petroleum Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, Regina, SK, S4S 0A2, Canada; Department of Petroleum Engineering, School of Chemical and Petroleum Engineering, Shiraz University, Iran
Bahram Dabir
Department of Chemical Engineering, Amir Kabir University of Technology, Tehran, Iran

ABSTRACT

The contribution of gravity drainage as a main production mechanism in fractured reservoirs has not previously been considered in the General Material Balance Equation (MBE). Although the traditional MBE for conventional oil and gas reservoirs has been modified and applied to fractured reservoirs, none of them explicitly incorporated the Gravity Drainage (GRD) mechanism. In this study, the MBE is reconstructed for fractured reservoirs to consider the effects of gravity drainage and reimbibition phenomena in the equation. This is realized using historical records of gas-oil contact level data in vertical fractures. The gravity drainage is numerically modeled in a series of synthetic cases (single matrix block and stacks of two and three matrix blocks), employing the finely gridded single porosity concept. A numerical computer program is developed to simulate the fluids' flow through the matrix and fracture system. Historical records of gas-oil contact in the vertical fractures, reservoir pressure, and production data are analyzed with the developed material balance equation to quantify the contribution of gravity drainage and all other active production mechanisms. Over 97% agreement is observed between the calculated oil production by gravity drainage based on our developed MBE and simulation results.


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