EXPERIMENTAL STUDY OF THE INFLUENCE OF BOTTOMHOLE PRESSURE OF PRODUCING WELLS ON RESERVE PRODUCTION FROM COMPLICATED CARBONATE RESERVOIRS

Abstract

The relevance of the research is caused by the fact that when developing the complex carbonate deposits, the difficulties often arise. They are associated with the operation of the reservoir pressure maintenance system and the choice of optimal technologies for development of oil reserves. Under these conditions, to maintain the production at a profitable level, it is necessary to optimize the bottomhole pressure of the wells. For oil companies developing carbonate deposits, it is worth paying attention to the value of the optimal bottomhole pressure, which ensures the most rational development of reserves, and not critical. Even though this issue has been considered for quite a long time by many domestic and foreign scientists, it remains unresolved now and at the same time it has significant scientific and practical importance. The main aim of the study is to substantiate the optimal bottomhole pressure of producing wells and its influence on the development of reserves from the complex carbonate reservoir of the Gagarinskoe oil field. Object: carbonate reservoir of the Gagarinskoe oil field. Methods: filtration units with reservoir conditions modeling UIK-5VG and AFS-300; using Roxar's Tempest Fluid Dynamic Simulator version 8.3.1. Results. Closing of natural fractures leads not only to a decrease in well productivity and to incomplete production of oil reserves in the drainage zone, but also to a low efficiency of the measures used, as well as to a deterioration in the hydrodynamic connection between wells. Therefore, under these conditions, it is important and necessary to substantiate the optimal bottomhole pressures of producing wells at the initial stages of the development of carbonate deposits. Laboratory studies and calculations using a geological and hydrodynamic model of a carbonate reservoir, which takes into account the peculiarities of the geological structure, have shown the practical value (expressed in an increase in oil production) of optimizing the bottomhole pressure of producing wells operating fractured carbonate reservoirs. The calculation of the economic component of optimization (regulation of the bottomhole pressure value) of the operation of three production wells of the Gagarinskoe field will additionally receive 19,5 million rubles.

Keywords

• natural fractures
• geological and hydrodynamic model
• oil production rate
• additional oil production
• water injection
• stress state of rocks
• permeability
• fracture opening