1887

Abstract

There exist a number of researches, which prove that the frequencies ranging from one to several thousands hertz as applied to oil reservoirs enhance the well stream and reduce watercut. Well-elaborated are the physical basis and various cases of basic technologies and solutions for commercial applications of vibroacoustic bottom hole treatment to restore the permeability and the increase the inflow in a well, but the question is still open regarding the mechanism to affect the remote flushed-out zone. This work addresses the wave EOR method. We have proven the relation of the natural frequency spectrum of the capillary trapped oil with the pore space in the reservoir, its current oil saturation and the external pressure gradient. The model was developed for the two-phase flow in the acoustic field based on the resonance effect on capillary trapped residual oil saturation. The model was backtested on site in Samotlor and other oil fields. Some model cases resulted in the methodic basis for efficient wave action application for various types of reservoirs and different development conditions. We provide evidence that oil recovery is enhanced locally if the oil reservoir is exposed to acoustic frequencies of 300 to 3000 Hz.

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/content/papers/10.3997/2214-4609.20143269
2012-09-10
2021-11-27
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