New information about the mechanism of oil displacement from productive reservoirs using flow control technologies

Rustam Mukhametshin,Gulnara Kvon,R Apakashev,D Simisinov,A Glebov

doi:10.1051/e3sconf/202017701012

Abstract

The article is devoted to improving the efficiency of methods application to increase oil recovery of deposits that are at the final stage of development. This stage is characterized by a high degree of waterlogging of reservoirs and extracted products. From a wide range of chemical methods for increasing oil recovery in Russian oil deposits, flow-regulating (flow-deflecting) technologies have become widespread. The article analyzes the results of purposeful use of thickened water for the completion of reserves of already flooded sandstone layers. Experimental studies were performed on two specially created five-point elements in the experimental sections of the Romashkinskoye deposit. To monitor the process of low-viscosity and high-viscosity oil displacement the following methods were used: a) intake, monitoring and production wells, in which the interval of productive horizons are lined with fiberglass pipes; b) method of high-frequency resistivity (technology of "VNIIneftepromgeophysics" Institute). The studies performed in the monitoring mode showed that, along with the increase in reservoir coverage by flooding at the macro level, there is also a displacement of part of the capillary-trapped oil in the already flooded layers’ intervals, that is, at the level of micro-uniformity of the porous medium. The paper concludes on the effectiveness of using flow-regulating technologies in conditions of high water availability of development objects.

Highlights

Large oil deposits in the Ural-Volga region and Western Siberia (Romashkinskoye, Samotlorskoye, Novo-Elkhovskoye, Tuymazinskoye, etc.), operated for 50-70 years and, in the figurative expression of V.D
The article is devoted to improving the efficiency of methods application to increase oil recovery of deposits that are at the final stage of development
Experts' estimates show that an increase in the final oil recovery factor (ORF) by only one point can provide an increase in annual production equal to 50-55 million tons

Summary

Introduction

Large oil deposits in the Ural-Volga region and Western Siberia (Romashkinskoye, Samotlorskoye, Novo-Elkhovskoye, Tuymazinskoye, etc.), operated for 50-70 years and, in the figurative expression of V.D. Lysenko and V.I. Greifer, which define the "face" of the industry, has already entered the final stage of development about 30 years ago due to the significant depletion of active reserves. The remaining oil in reservoirs with a water cut of more than 90 % is one of the most complex categories of hard-to-recover reserves, since it is the result of shortcomings and omissions in the development system accumulated during the previous stages of development [1]

Methods

Results

Conclusion