Воздействие на остаточные запасы карбонатных коллекторов мелких месторождений

Abstract

Background The large amount of the residual, hard-to-recovery hydrocarbon reserves of the Volga-Ural oil and gas province is contained in carbonate reservoirs. In Tatarstan, there are many deposits of hydrocarbons in carbonate reservoirs, which, as a rule, have a complex geological structure. Oil reserves of such deposits are related to hard-to-recover reserves. Development of such oil reserves will maintain the level of hydrocarbon production for a long time. One of the more rational field development way is the intensification of production wells. For this purpose, the various methods are widely implemented in carbonate formations. Thus, the improvement of the efficiency of oil carbonate reservoirs operation is a highly relevant problem. Aims and Objectives Improvement of the efficiency of the impact on the remaining reserves of carbonate reservoirs. Intensification of capillary saturation in the bottomhole and remote areas of the reservoir. Methods Theoretical investigation of the oil displacement mechanism from low-permeable carbonate reservoirs and analysis of the results of laboratory studies of core material. Field studies of the proposed method. Results There was developed the way of treatment of residual hydrocarbon reserves in carbonate collectors of the Bashkirian and Vereyskian strata Kurmyshskoe oilfield. Recovery improvement measures implemented on the production well allowed to significantly increase the technological parameters of operation. Conclusion A model of the void space structure of productive carbonate formations of the Bashkirian and Vereyskian strata is offered. On the basis of previous studies analysis the mechanism of oil displacement from the void space of carbonate reservoirs is developed. Tests of the proposed method were conducted in order to increase the efficiency of oil recovery from the reservoir and proved the possibility of successful application of that method in low pressure reservoirs Melekesskian hollow.