One more method of heavy oil extraction from a formation
The article considers the problem in relation to development of a method of heavy oil displacement from a formation, providing oil viscosity reduction and oil recovery enhancement. The essence of the proposed work lies in the fact that the method of heavy oil displacement from a reservoir includes an oxidant injection through the injection well, followed by the water-flooding, herewith, 10 % mixture of aqueous solution of potassium or sodium dichromate and additionally 0,1…0,9 m3 per 1 m3 of turpentine are injected in the well as an oxidant, so the total amount of the injected agents should be no more than 0,1 of the formation porous volume. The proposed heat carrier is a novelty. The expected economic efficiency compared to the prior well-known methods consists of several sources, such as up to 5 % enhanced oil recovery, 5…6 times less the cost of reagents, improved inhibitory properties of the proposed compositions as well as the ecological feasibility of the new reagents application. Oil production intensification and enhancement of oil recovery out of formations when injecting heat carrier is achieved by oil viscosity reducing, thermal expansion of the formation oil and the formation skeletons as well as the intensification of capillary impregnation (for hydrophilic formations). As a result, oil mobility and its phase permeability and the formation coverage by the displacing agent increase, thus creating conditions for oil displacement from low-permeable rock pillars due to the anti-capillary impregnation.