Abstract
Recovering offshore heavy oil whose viscosity is more than 350 mPa·s with conventional method is not effective and commercial has low productivity and poor economic benefits, hence the utilization of thermal method is necessary. The exploitation of offshore oilfields is conducted on platforms with high investment in drilling, well completion and engineering, resulting in a poor economic performance. Therefore, the selection of thermal agents should not be completely determined by the empirical consequence of onshore oilfields exploitation. In this study, indoor experiments and numerical simulations were performed to study the oil displacement mechanism of different thermal agents in the heavy oil reservoir with low viscosity crude oil which can flow at reservoir condition: core hot water flooding experiments at different temperatures were first conducted to study the effect of temperature on hot water flooding; then the numerical simulation was adopted to investigate the heat radius, average temperature of heat area, average oil viscosity of heat area and cumulative oil production of hot water and steam stimulation at different cycles and injection temperatures. Based on the economic evaluation of offshore oilfields, the commercial thermal recovery method for offshore reservoir exploitation was initially determined, which can direct the economic and effective exploitation of heavy oil reservoirs in Bohai in the future.KeywordsOffshore heavy oil reservoirHot water injectionOil production performanceOptimizationInjection temperatureEconomic evaluation
Published Version
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