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A new method for quantitative description of water cone shape of vertical well in bottom-water reservoir
Author of the article:ZHANG Wei
Author's Workplace:Research Institute of Exploration and Development, Tianjin Branch of CNOOC Ltd.
Key Words:bottom water reservoir; quantitative description; water cone shape; orthogonal design; multiple linear regression
Abstract:The vertical well relying on the natural energy in bottom-water reservoir must form the water cone. In order to analyze water flooding condition around the vertical well and the distribution of remaining oil, it is necessary to quantitatively describe water cone shape. Based on the actual formation parameters of a bottom-water reservoir in Bohai, this article establishes one reservoir numerical simulation mechanism model, considers the vertical permeability and horizontal permeability ratio, oil-water viscosity ratio, avoiding water height of vertical well, effective thickness of oil layer and water cut as main factors influencing the water cone shape. Firstly, the paper uses mechanism model to quantitative analysis the influence of single factor variation on the water cone shape; then, establishes orthogonal experiment design of five factors and four levels, uses multiple linear regression method to return the result of the experiment, using which method we get the quantitative description formula of water cone shape of vertical well under the influence of multiple factors. Taking one well of a bottom-water reservoir in Bohai as an example for verification of formula, the results show that the quantitative description formula can meet the need of the mine.
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