One of the key aspects in the development of heavy and extra heavy oil resources is the creation andapplication of effective development technologies.The heterogenic carbonate reservoir represented thepermian-carboniferous deposit of the Usinskoe oil field in the capacity of a place for testing the technologyfor the extraction of super-viscous oil using carbon dioxide(CO2).The paper presents the results of PVT study and flooding experiments on cores and slim tubes(slim-tubemethod)performed under various thermobaric conditions corresponding to different zones of the permian-carboniferous deposit.The purpose of the research is to evaluate the effectiveness of the application of CO2injection technology together with the heat carrier to increase oil recovery from a deep-seated heavy oilreservoir.As a result of the studies,it was found that the most effective condition of displacement of super-viscousheavy oil by carbon dioxide in the conditions of the permian-carboniferous deposit of the Usinskoe oil fieldis the immiscible displacement condition.The displacement of super-viscous heavy oil by carbon dioxide from a low-permeability porous matrixat low temperatures is ineffective without preliminary heating of the reservoir.It has been shown by the experiments that preliminary heating provides an increase in the efficiency ofthe displacement of super-viscous heavy oil by carbon dioxide-the oil recovery factor increases and thegas-oil ratio decreases.The results of flooding experiments show that there is an optimal ratio of the heat carrier and CO2injection volume,which makes it possible to increase the efficiency of the thermal process and the reservoirdevelopment indicators.
展开▼
