ПОВЫШЕНИЕ ЭФФЕКТИВНОСТИ НЕФТЕИЗВЛЕЧЕНИЯ ИЗ ЗАЛЕЖЕЙ, ПРЕДСТАВЛЕННЫХ КАРБОНАТНЫМИ КОЛЛЕКТОРАМИ

Abstract

Background A significant portion of the marginal, hardly recoverable hydrocarbon reserves of the Volga-Urals region is in the carbonate reservoirs. In Bashkortostan there are many deposits of hydrocarbons contained in the carbonate reservoirs, and, as a rule, they have a complex geological structure. Oil reserves in such deposits are considered hardly recoverable. Development of these reserves will allow to maintain the level of hydrocarbon production for a long time. One of the elements of a more rational field development is stimulation of producing wells. For this purpose, various kinds of treatment of the carbonate formations are widely used. Higher efficiency of developing oil deposits with carbonate reservoirs is an urgent task. Aims and Objectives Increase the efficiency of recovering residual oil reserves from the carbonate reservoirs. Carry out work to enhance the capillary imbibition processes in the bottom-hole and remote zones of the reservoir. Methods Analytical methods of studying mechanism of oil displacement studies from low permeability carbonate reservoirs and results of laboratory tests of core material. Experimental research of the proposed method of treatment in field conditions. Results of the work to improve the productivity of producing wells were analyzed using mathematical methods of research. Results A treatment method was developed for residual reserves in carbonate deposits of the Bashkir and Verey stages of the Volga-Urals fields. Execution of work to improve the productivity of the producing wells has allowed significant increase in the technological parameters of operation. Conclusion A structural model is offered for the voids of productive carbonate strata of the Bashkir and Verey stages. On the basis of summarizing the literature data, the mechanism of oil displacement from the voidage of carbonate reservoirs is offered. Testing of the process aimed at higher efficiency of oil recovery from producing formations proved the possibility of its successful use in low reservoir pressure conditions of Melekess depression deposits.