The Effects of Combination of Steam Flooding, CO2 and Cyclic Steam Stimulation Injection Pilot Test in Heavy Oilfield in Sudan
苏丹的“FUL”油田因浅层油藏受到大面积边底水驱以及高原油粘度的影响，提高油藏采收（EOR）技术在该地区显得尤为必要，以保持油供稳定。本研究通过对当前生产井、射孔间距、CO2温度分析和蒸汽参数优化进行全面研究，采用确定性和随机两种方法，在试验区域进行连续蒸汽驱、CO2辅助蒸汽驱以及蒸汽吞吐试验。利用CMG-STARS和CMOST AI模拟软件，以采收率（RF）为目标函数。研究结果表明，CO2辅助蒸汽驱可以降低含水率，但对提高油藏采收率的效果不显著，连续蒸汽驱在三种方法中效果最佳。
关键词：
重质油、提高油藏采收（EOR）、蒸汽驱、采收率（RF）、CO2、CSS、CMG、CMOST。
Abstract
Applications of Enhanced Oil Recovery (EOR) are highly required and needed in Sudan to keep oil supply at stable levels. ”FUL” Oilfield in Sudan has shallow reservoir affected by big boundary and bottom water drive with high crude oil viscosity. This research, through a comprehensive analysis of the current producing wells, perforation intervals, CO2 temperature analysis, steam parameters optimization which using two approaches (deterministic and stochastic) were analyzed, using a combination of continues steam flooding, CO2 assisted steam flooding, and cyclic steam stimulation in the pilot test sector. CMG-STARS and CMOST AI simulators software was used in this study. By determining recovery factor (RF) as objective function. It could conclude that: CO2 assisted steam flooding even it could decrease the water cut, but its effect to increase the oil recovery factor is not considerable. Continuous steam flooding has the best oil recovery from these three methods.
Keywords
Heavy-Oil, Enhanced Oil Recovery (EOR), Steam Flood, Recovery Factor (RF), CO2, CSS, CMG, CMOST.
