三元复合驱后剩余油微观特征

MICROSCOPIC CHARACTERISTICS OF THE REMAINED OIL AFTER ASP FLOODING

三元复合驱是一种有效提高采收率的方法,但驱后仍然有很多原油残留地下。为了进一步认识三元复合驱后微观剩余油分布类型和状态,利用激光共聚焦技术、现代物理实验模拟方法、现场取心井采出的天然岩心对三元复合驱后剩余油微观分布规律进行研究。结果表明,三元复合驱后剩余油主要以孔表薄膜状分布在孔隙中,而其中大部分为难以采出的重质油。研究成果对于进一步提高采收率方法选择具有一定参考价值。

ASP flooding is an effective method to enhance the oil recovery, but there is still a lot of crude oil remained after the flooding. In order to further understand the microscopic distribution types and states of the remained oil after the flooding, by means of laser con-focusing technique, moder physical experimental simulating method and the natural cores sampled from the field coring wells, the distribution laws of the microscopic remained oil after ASP flooding are figured out. The result shows that the remained oil is mainly distributed in the pore sur- face and fractures in the form of thin film, but most of them are heavy oil which can not be easily produced. All the achievements possess a certain reference value for the choice of the further enhancing methods of the oil recovery.