稠油油藏化学辅助蒸汽吞吐研究

Chemical Assisted Steam Soaking in Heavy Oil Reservoirs

稠油具有粘度高、密度大、流动性差的特点,此类油藏的开发主要以热采为主。目前,蒸汽吞吐仍是矿场上使用最为广泛的热采方法之一。以胜利油田草27地区馆陶组油藏为例,利用油藏数值模拟方法,优选出了适合该稠油油藏化学辅助蒸汽吞吐的方法,确定出了"蒸汽+N2辅助"、"蒸汽+CO2辅助"、"蒸汽+表面活性剂+CO2+N2辅助"方案各自的最佳组合比例。分别为CO2注入量越多,增油效果越好,N2与蒸汽最佳气液比为0.8,表面活性剂最佳浓度为0.7%。研究结果可为目标油藏及其他同类型油藏的化学辅助蒸汽吞吐驱油提供参考依据。

The main development method for heavy oilfield was thermal recovery for heavy oil,it had features of high viscosity,great density and poor mobility.Nowadays steam soak was one of the most widely used thermal method in the oilfield.This article regarded reservoir Guantao Formation in Cao 27 Area of Shengli Oilfield as its objective reservoir.By establishing a three-dimensional geological model and using numerical reservoir simulation method,the steam stimulation method assisted by chemical agents is optimized which is suitable for the heavy oilfields.The projects of optimum proportion of 'steam + nitrogen gas assistance','steam + carbon dioxide assistance','steam + surfactant + carbon dioxide + nitrogen gas assistance' are determined.The results provide reference for the steam soak method assisted by chemical agents for the objective reservoir and similar reservoirs.