Analytical method for estimating efficiency of oil recovery technology in case of bottom water-drive reservoir, verified on the hydrodynamic model

UDK: 622.
DOI: 10.24887/0028-2448-2018-6-66-69
Key words: oil cone, underlying water, reduced watercut, analytical solution
Authors: R.F. Yakupov (Bashneft-Dobycha LLC, RF, Ufa), A.A. Gimazov (BashNIPIneft LLC, RF, Ufa), V.Sh. Mukhametshin (Branch of Ufa State Petroleum Technological University in Oktyabrsky, RF, Oktyabrsky), R.I. Makaev (BashNIPIneft LLC, RF, Ufa)

The article considers the technology of formation of the converse oil cone below the level of water-oil contact (WOC). The use of this technology makes it possible to reduce the water cut in the production of covert oil on waterfowl. It is important to choose the optimal technological parameters. For the effective application of the technology, a complete cone formation is necessary. This task can be solved by the methods of hydrodynamic modeling, but for the processing of a large array of wells and initial selection of candidates, the development of an analytical technique is advisable.

In this paper, we propose an analytical technique for estimating the formation time of the inverse cone of oil, depending on the properties of the formation and fluids. The basis was the formula for calculating the time of raising the water cone above the WOC level in the case of immiscible liquids in the reservoir with an isotropic absolute permeability. Based on the hydrodynamic modeling a method for taking into account relative phase permeability is proposed. To account for the anisotropy coefficient with the help of hydrodynamic modeling the time dependence of the formation of the oil cone on the anisotropy coefficient for different viscosity ratios of water and oil was constructed. These results are described with sufficient accuracy by a power law. Thus, the formula for calculating water cone parameters is adapted to calculate the oil cone data below the WOC level.

An algorithm for the analytical calculation of the formation time of the oil cone is developed on the basis of well sampling parameters, which makes it possible to quickly estimate the formation time of the oil cone for the given conditions. The proposed algorithm is verified on hydrodynamic models and has a good predictive ability. The practical value of the developed algorithm is the ability to quickly calculate the time of formation of an oil cone for a large number of wells.


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