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New Optimization Criteria of Waterflood Patterns Preventing Premature Water Breakthrough in The Context of Water-Oil Displacement Front Instability
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Tyumen 2021, Mar 2021, Volume 2021, p.1 - 5
Abstract
In the context of high water cut of most oil fields in Russia, problem of oil recovery enhancement using modern non-stationary hydrodynamic methods of oil reservoir stimulation combined with effective tertiary oil recovery methods becomes relevant. Using Buckley-Leverett mathematical model of two-phase displacement in hydrodynamic modelling of water-flood operations leads to water saturation discontinuity in the instability zone of water-oil displacement front. Existing methods of relative permeability curves approximation for elimination of water saturation «jump» on the distribution curve Sw(x,t) do not characterize an adequate physical mechanism of the instability of water-oil displacement front, which formed in terms of hydrodynamic, capillary, molecular, inertial and gravity forces interaction. Those forces cause premature water breakthrough and thus decrease of oil recovery efficiency. This paper proposes a new approach to system optimization of nonstationary water flooding, which is to select the control strategy of production and injection wells operation conditions as well as effective geo-technical measures (including appropriate EOR and production stimulation methods). The choice is based on qualitative dynamic analysis of current and cumulative oil/water production from each well using the mathematical apparatus of quadratic polynomial dynamic systems.