«Oilfield engineering»

Analysis of the structure of the design oil recovery factor during water-flooding

UDC: 622.276.43
DOI: -

Authors:

¹ National University of Oil and Gas "Gubkin University", Moscow, Russia

Keywords: A.P. Krylov’s formula, material balance equation, change in oil volume, dissolved gas, volumetric sweep efficiency

Annotation:

The formulas for calculating the oil recovery factor during water-flooding, including A.P. Krylov binomial formula, do not take into account the mechanisms of oil extraction except for oil displacement by water and, strictly speaking, are valid only if reservoir pressure is maintained at the initial level. The theory of oil fields development indicates that often several types of reservoir energy are involved in the process of oil reserves recovery, including changes of oil volume, pore volume and gas expansion released from oil when reservoir pressure decreases lower than saturation pressure. The material balance method or three-dimensional hydrodynamic modeling can be used as a mathematical apparatus for calculating the contribution of these technogenic processes to the oil recovery factor, the corresponding calculation formulas are presented in the article. For the conditions given, it is shown that when the reservoir pressure is maintained at the level below the saturation pressure, the contribution of these man-made processes to the oil recovery reaches 6 percentage points.

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