Development of Solvent and Steam-Solvent Heavy Oil Recovery Processes Through an Integrated Program of Simulation,Laboratory Testing and Field Trials

摘要

ExxonMobil and its Canadian affiliate Imperial Oil Resources are pursuing an integrated research program targeted at developing the next generation of heavy oil recovery processes which utilize light hydrocarbon solvents in conjunction with steam or as an alternative to steam-only processes to mobilize the in-situ heavy oil.The key benefits of employing solvent are improved economics and increased recovery from resource that is impractical with steam-only processes,improved environmental perfor- mance,particularly reduced greenhouse gas emissions and reduced water use. A suite of field trials,pilots and commercial applications have been operating over the past several years at Imperial Oil’s Cold Lake field in Alberta,Canada.These have included both solvent-assisted and solvent-only field trials.Collectively,the results of these trials show that solvent recovery processes for heavy oil are technically viable and have considerable commercial potential.This paper summarizes the dimensions of the integrated research program that have been key to delivering the successful results to date.Simulation,laboratory testing and physical modelling with a focus on scaling to the field have been employed extensively prior to field testing.Short-term,relatively low cost field trials have been utilized to calibrate models prior to more costly,longer term pilots with dedicated facilities.Extensive field characterization has been conducted prior to final site selection and pilot operation.Integrated operational and surveillance plans have been employed to ensure measurable and reliable field performance data is acquired that can be used to calibrate and validate simulation performance.Finally,learnings from this integrated research program can be more broadly applied to the commercialization of other EOR processes and the research and development processes leading up to the decision to execute a major pilot.