ASSESSMENT OF TECHNOLOGICAL AND ECONOMIC EFFICIENCY OF FRACTURING FORMATIONS USING GEOLOGICAL AND HYDRODYNAMIC MODELS, CONSIDERING FEATURES OF CARBONATE RESERVOIR STRUCTURE

Abstract

The relevance of the discussed. Currently, one of the most effective methods to intensify oil production in the Perm Territory and throughout the world is hydraulic fracturing. The conducted hydraulic fracturing measures are often accompanied by an increase in water cut of the produced products due to the fact that during the event the hydraulic fracturing spread in vertical direction and thereby increased the channels connecting the water-saturated and oil zones. This negative effect could beavoided if before the work on the well the event was modeled on a geological and hydrodynamic model that takes into account the specific geological structure of this deposit. Knowledge of the structural features of carbonate deposits allows us to significantly clarify and improve the existing geological and hydrodynamic models. Accordingly, the use of geological and hydrodynamic models that take into account the structural features of carbonate objects will allow choosing a rational system of development and ensuring optimal geological and technological measures and, as a result, will lead to a decrease in economic risks. The main aim of the study is toevaluate the technological and economic efficiency of hydraulic fracturing using a hydrodynamic model that takes into account the geological features of the carbonate reservoir structure. Object: Famennian carbonate reservoir of the Gagarinsky field. Methods: processing of geological research data; use of the Tempest hydrodynamic simulator version 8.3.1 from Roxar. The results obtained during the simulation of hydraulic fracturing at six candidate wells showed that the use of the standard model (currently used) compared to the modified geological and hydrodynamic model (takes into account the permeability anisotropy and fracturing) leads to overestimation of some technological indicators (increase in oil production and cumulative oil production) and to underestimation of others (the water content of the extracted products), which, respectively, subsequently can lead to a distortion in economic component of events. The economic analysis made it possible to establish that the net discounted income calculated on the modified geological and hydrodynamic model turned out to be 3,7 times less than the standard one, which is undoubtedly important indicators in selecting candidates for planning geological and technological measures.

Keywords

• vertical and horizontal permeability
• fracturing
• increase in water cut
• increase in oil production rate
• economic feasibility
• additional oil production