Evaluation of the Vertical Producing Degree of Commingled Production via Waterflooding for Multilayer Offshore Heavy Oil Reservoirs

Fei Shen, Linsong Cheng, Qiang Sun and Shijun Huang
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Fei Shen: College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
Linsong Cheng: College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
Qiang Sun: Tianjin Branch of CNOOC Ltd., Tianjin 300452, China
Shijun Huang: College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China

Energies, 2018, vol. 11, issue 9, 1-15

Abstract: Recently, commingling production has been widely used for the development of offshore heavy oil reservoirs with multilayers. However, the differences between layers in terms of reservoir physical properties, oil properties and pressure have always resulted in interlayer interference, which makes it more difficult to evaluate the producing degree of commingled production. Based on the Buckley–Leverett theory, this paper presents two theoretical models, a one-dimensional linear flow model and a planar radial flow model, for water-flooded multilayer reservoirs. Through the models, this paper establishes a dynamic method to evaluate seepage resistance, sweep efficiency and recovery percent and then conducts an analysis with field data. The result indicates the following: (1) the dynamic difference in seepage resistance is an important form of interlayer interference during the commingled production of an offshore multilayer reservoir; (2) the difference between commingled production and separated production is small within a certain range of permeability ratio or viscosity ratio, but separated production should be adopted when the ratio exceeds a certain value.

Keywords: multilayer reservoir; interlayer interference; producing degree; seepage resistance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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