PLANNING OF CYCLIC WATERING BASED ON ANISOTROPIC HYDRODYNAMIC MODEL OF THE CARBONATE DEPOSIT OF GAGARINSKOEFIELD

Abstract

The relevance. Today, one of the urgent and the most important tasks in the oil industry is to increase the final oil recovery ratio.Much attention is now paid to the so-called hydrodynamic methods of increasing the oil recovery coefficient. One of the most simple, inexpensive, and frequently used hydrodynamic methods is cyclic flooding.A very important problem both from a scientific and a practical point of view is the possibility of using cyclic water flooding in complex reservoirs with low filtration and capacity properties, which most oil companies have begun to develop. At the moment, in order to evaluate the effectiveness of the technology, as well as to avoid undesirable consequences when applying it, hydrodynamic modeling is used. To solve this problem, an adapted geological and hydrodynamic model was used, taking into account the fracturing and the permeability anisotropy parameter of the Tournaisian-Famennian deposit of the Gagarinskoe field. The main aim of the study is to assess the possibilities of implementing cyclic flooding based on a modified geological and hydrodynamic model that takes into account geomechanical effects. Object:complex Tourneys-Famennian carbonates deposit of the Gagarinskoe field. Methods: the Roxar Tempest hydrodynamic simulator version 8.3.1. Results. The performed modeling of cyclic waterflooding in certain areas of the Gagarinskoe field deposits showed a decrease in water production, accompanied by an increase in oil production. It should also be noted that the transition from stationary to cyclic waterflooding did not have a positive effect on all reacting production wells (increase in oil production), this is mainly due to the presence of vertical permeability (permeability anisotropy parameter). It is also confirmed that the omission of the permeability anisotropy parameter and the presence of natural fracturing in geological and hydrodynamic models leads to an overestimation of the parameter of cumulative oil production.

Keywords

• fracturing
• vertical permeability
• additional oil production
• water cut
• half cycle
• filtration flow