| Popis: |
The development of a high-viscosity oil deposits has produced a unique situation of sequential testing of non-stationary waterflooding and thermal stimulation technology. Since there was stationary water injection used before transition to thermal treatment, it is possible to investigate the reaction of the development system to stopping cyclic water injection and to starting thermal treatment. The article shows that there is no proven positive effect of hot water injection in the considered areas of the deposits. On the other hand, the termination of non-stationary impact and the transition to stationary water injection are always accompanied by an increase in water content. However, if the reservoir pressure rises as a result of increased compensation for withdrawals by water injection, there is a consequent reduction in water content and an increase in oil flow rate. Obviously, creating high pressure gradients is a priority in the development of high-viscosity oil reservoirs. Based on actual data, we establish the technological efficiency of the transition from cyclic injection to stationary waterflooding and then to thermal influence. |
