稠油重力泄水辅助蒸汽驱蒸汽超覆研究  

Study on Steam Overlay in Gravity Drainage Assisted Steam Flooding for Heavy Oil Development

作　　者：周鹰[1] Zhou Ying(PetroChina Liaohe Oilfield Company,Panjin,Liaoning 124010,China)

机构地区：[1]中国石油辽河油田分公司,辽宁盘锦124010

出　　处：《特种油气藏》2018年第4期99-102,共4页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项"辽河新疆稠油/超稠油开发技术示范工程"(2016ZX05055)

摘　　要：重力泄水辅助蒸汽驱技术井网结构复杂,蒸汽腔的控制和超覆机理有别于传统蒸汽驱,需要结合不同原油黏度特点和蒸汽腔控制特点进行理论探索。考虑启动压力梯度、蒸汽前缘上边界变化和拟流度比,对蒸汽超覆理论进行推广,简化蒸汽超覆系数,得到液相等压面及蒸汽相前缘数学模型。经验证,该方法与数值模拟软件结果一致,同时直观展示了液相等压面及蒸汽相前缘变化趋势,揭示了蒸汽相超覆及前缘滞后规律。该研究可为明确蒸汽超覆程度,提高蒸汽前缘波及效率,进一步挖掘剩余油潜力提供理论指导。With complicated well patterns,gravity drainage assisted steam flooding technique may involve control of steam chamber and overlay mechanisms different from those of conventional steam flooding techniques.Under such circumstances,it is necessary to conduct theoretical researches for viscosity of different crude oil and controlling techniques for steam chambers.It is necessary to initialize pressure gradients,changes on upper boundaries of steam front and pseudo fluidity to promote steam overlay theories,to simplify steam overlay factors and to derive mathematical models for liquid isobaric surfaces and steam fronts.Field application results show the innovative technique may generate results identical to those of numerical simulation software.In addition,these techniques may effectively highlight changes in liquid isobaric surfaces and steam fronts to reveal patterns of overlapping and front lagging of steams.Relevant researches may provide theoretical guidance to clarify levels of steam overlay,to enhance sweep efficiency of steam front and to further expand potentials of residual oil.

关 键 词：重力泄水辅助蒸汽驱 蒸汽超覆 蒸汽相前缘滞后 压力梯度 

分 类 号：TE357.44[石油与天然气工程—油气田开发工程]