Cyclic Supercritical Multi-Thermal Fluid Stimulation Process: A Novel Improved-Oil-Recovery Technique for Offshore Heavy Oil Reservoir

Cyclic supercritical multi-thermal fluid stimulation (CSMTFS) is a novel technology that can efficiently recover heavy oil, while the heating effect, production and heat loss characteristics of CSMTFS have not been discussed. In this study, physical simulation experiment conducted with three-dimensional experimental system. The results study indicate whole process be divided into four stages, namely, preheating stage, increase stable stage decline which main oil secondary stage. first two stages process, there no chamber, only relatively small chamber formed in last process. Out water thermal fluids condensates to hot flows downward subjacent layer. At same time, non-condensate gas accumulates upper part layer reduces loss. analysis shows rate gradually increases at then tends stable. Compared conventional fluid, more effectively reduce enthalpy value significantly increased compared solves problem insufficient carrying capacity fluid. Overall, cyclic solve problems recovery offshore recovery; it indeed new improved-oil-recovery technique for oil. findings help better understanding This significant helpful application recovery.