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Energies 2018, 11(9), 2428; https://doi.org/10.3390/en11092428

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

1
College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
2
Research Institute of Petroleum Exploration and Development, Zhongyuan Oil Field, Sinopec, Zhengzhou 450046, China
3
Tianjin Branch of CNOOC Ltd., Tianjin 300452, China
*
Author to whom correspondence should be addressed.
Received: 15 July 2018 / Revised: 28 August 2018 / Accepted: 10 September 2018 / Published: 13 September 2018
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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. View Full-Text
Keywords: multilayer reservoir; interlayer interference; producing degree; seepage resistance multilayer reservoir; interlayer interference; producing degree; seepage resistance
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Shen, F.; Cheng, L.; Sun, Q.; Huang, S. Evaluation of the Vertical Producing Degree of Commingled Production via Waterflooding for Multilayer Offshore Heavy Oil Reservoirs. Energies 2018, 11, 2428.

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