POLYMER SELECTION FOR POLYMER FLOODING AT HIGHLY VISCOUS OIL FIELD

Currently, up to 40% of Kazakhstan's oil production is produced from mature oil fields, with a steadily increasing rate of decline in production. One of the most common and highly effective methods for increasing oil recovery is polymer flooding, which allows solving the problems of uneven displacement and increased water cut of products, and low sweep efficiency. The successful implementation of this method largely depends on the correctly selected polymer to create a stable polymer solution with the ability to maintain the viscosity of the injected water for a long time. In addition, the polymer must be highly resistant to the thermobaric conditions of the formation, as well as the composition of formation and injected waters. To select a suitable polymer, within the framework of this work, laboratory tests were carried out on core to determine the displacement coefficient for a field with highly viscous oil under conditions of highly mineralized injected water. Selecting the optimal polymer will not only increase the efficiency of polymer flooding, but also extend the life of the field.