CT技术在改性淀粉凝胶体系运移特征研究中的应用  

Application of CT technology in migration characteristics research of modified-starch gel system

作　　者：冷光耀[1,2,3] 赵凤兰[1,2,3] 侯吉瑞[1,2,3] 徐宏明[1,2,3] 张春蕾[1,2,3] 王嘉晨[1,2,3] 宋文秀[1,2,3] 

机构地区：[1]中国石油大学(北京)提高采收率研究院,北京102249 [2]中国石油三次采油重点实验室,北京102249 [3]石油工程教育部重点实验室,北京102249

出　　处：《油气地质与采收率》2015年第2期78-82,共5页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"油田开采后期提高采收率技术"(2011ZX05009-004);国家示范工程"大庆长垣特高含水油田提高采收率示范工程"(2011ZX05052)

摘　　要：目前,常规调剖实验只能获得岩心前后端的参数指标,而对油水及调剖体系等流体在模型中的运动过程无法直观地呈现。为此,利用计算机断层扫描技术,在保证环氧树脂浇铸模型无损的条件下,对模型驱替过程跟踪扫描,重建了驱替过程中不同时间的水驱前缘位置及改性淀粉凝胶体系的运移特征图像。实验结果表明,计算机断层扫描技术可有效用于研究和呈现改性淀粉凝胶体系的运移特征,对于渗透率级差为30的正韵律岩心模型,可得到一次水驱低渗透层被启动的位置并可直观看到,调剖体系在高渗透层中以整体段塞形式运移,成胶后,可有效封堵高渗透窜流通道,实现了定位调堵,明显扩大后续水的波及体积,使水驱采收率提高了15.08%。Nowadays,parameter at both ends of the core may be gotten through conventional profile control experiments.However,the flow process of fluid such as oil,water or profile control system could not be visually presented in those experi-ments. In this paper,CT technology was applied to observe the dynamical flooding processes in core model casted by epoxyresin without damage,and then the front location of the water flooding and migration characteristics of modified starch gelin different times were re-established. Experimental results show that the CT technology can be effectively used in migra-tion characteristics research and presentation for the profile control system. When it is applied to a positive rhythm coremodel with a permeability contrast of 30,the starting location of the low permeability layer in the first water drive could begiven and seen. In the meantime,the profile control system can flow forward with the whole slug state in the high permeabil-ity layer,which can effectively shut off the flow channel in the high permeability layer after the gel is formed. Positioningprofile control and water plugging may be realized and swept volume of the subsequent water may be expanded obviously.Oil recovery efficiency by water flooding is increased by 15.08%. This paper provides a new experimental method and re-search idea about the deep water plugging and profile control in heterogeneous reservoirs.

关 键 词：含水饱和 度计算机断层扫描技术 改性淀粉凝胶体系定位调堵 岩心模型 

分 类 号：TE357.43[石油与天然气工程—油气田开发工程]