水驱油藏特高含水期微观剩余油渗流特征研究

Percolation characteristics investigation of microscopic remaining oil in water flooding reservoir with ultra-high water cut

 于春磊¹ 糜利栋² 王川² 赵玉云² 姜汉桥² 田野²

中国石化胜利油田分公司勘探开发研究院，山东 东营 257015 中国石油大学（北京）石油工程教育部重点实验室，北京 102249）

Research Institute of Exploration and Development, Shengli Oilfield Company, SINOPEC, Dongying 257015, China MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China)

 水驱油藏进入特高含水期后仍具有一定挖潜潜力，微观剩余油流动特征及运移规律的研究对于特高含水期水驱油藏提高采收率具有重要意义。文中通过微观玻璃刻蚀模型实验和计算机图像识别处理技术对微观剩余油流动形态进行分类，分析微观剩余油流动形态及变化规律。研究结果表明：特高含水期，考虑油￣水￣孔喉接触关系，可将剩余油流动形态分为簇状流、多孔流、柱状流、膜状流和滴状流5类，其中簇状流分布比例最多，是引起相渗曲线下弯的主要因素，并且随着含水饱和度的上升，簇状流逐渐转化为多孔流、柱状流、膜状流和滴状流；同时从微观上解释了特高含水期油水微观流动规律及相渗曲线非线性的原因，为特高含水期油藏提高剩余油动用程度和采收率提供指导。

 The study of remaining oil percolation characteristics under microscopic pore scale plays an important role in enhanced oil recovery for ultra-high water cut period water flooding reservoir. In this paper, microscopic glass-etching model experiments and computer image processing & recognition techniques are combined to re-classify the microscopic remaining oil flowing patterns to analyze the flowing shape and the connect-relationship among the oil, water and rock. Research result indicates all the remaining oil in ultra-high water cut period can be classified into five categories, clustered stream, multi-porous stream, columnar stream, membranous stream and droplet stream. Among of the five categories, clustered stream possess the largest proportion and is also the main factor of relative permeability curves re-curved. Meanwhile, with water saturation rising, clustered stream gradually transforms into other patterns like multi-porous stream, columnar stream, membranous stream and droplet stream. The flow rules of the remaining oil and the reason of the non-linear percolation curve are explained microscopically, which provides a guiding for the development and recovery of water flooding reservoir with ultra-high water cut.

10.6056/dkyqt201605010