Accounting for the presence of an impermeable boundary and a supply contour when determining well drainage zones
UDC: 622.276
DOI: 10.33285/2413-5011-2023-5(377)-62-68
Authors:
KAZAKOV ANDREY A.
1
1 Lomonosov Moscow State University, Moscow, Russia
Keywords: current lines, well drainage zones, presence of an impenetrable boundary and supply contour, pressure gradients, residual oil reserves
Annotation:
The features of the operational assessment of well drainage zones in the presence of an impermeable boundary and a supply contour are considered. The proposed method is based on finding a flow-separating boundary between production wells when fluid is filtered to them from injection wells and the power circuit. The main accepted assumption is the distribution of current flow lengths from the main to the neutral one according to the exponential law. The current flow lengths are unchanged only during the unit of measurement (month), depending on the flow rates of the wells they change. Drawdowns in wells were determined by known well flow-rates applying the superposition method. The calculations performed showed that the difference in the total remaining oil reserves calculated by the application of the proposed approach and by hydrodynamic models did not exceed 7 %. The estimates of reserves in the drainage zones of individual wells are also qualitatively coincided.
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