塔河油田缝洞型碳酸盐岩油藏注氮气及注泡沫提高采收率研究  

Research of N_2 Flooding and N_2 Foam Flooding for EOR Fractured-Vuggy Carbonate Reservoirs of the Tahe Oil Field

作　　者：苑登御 侯吉瑞[1,2,3,4] 王志兴[1,2,3] 苏伟[1,2,3] 赵大鹏[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]中石油三次采油重点实验室低渗油田提高采收率应用基础理论研究室,北京102249 [3]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [4]中国石化海相油气藏开发重点实验室,北京102249

出　　处：《地质与勘探》2016年第4期791-798,共8页Geology and Exploration

基　　金：国家重大专项(2011ZX05014-003);国家973专题(2011CB201006);国家自然科学基金(51504268);中国石油大学(北京)科研基金(2462014YJRC053)联合资助

摘　　要：塔河油田开中后期,面临储层天然能量不足,注水开发稳产期短、油井含水率高及采收率偏低等问题针对这些问题。本文利用制作的三维立体仿真模型进行了注N_2驱与注N_2泡沫驱提高采收率效果评价实验。结果表明气水交替驱可提高采收率25.93%,高于恒速N_2驱的23.46%,这是由于气水交替注入不仅有注N_2补充能量的作用,还有注水压锥的效果、同时增加抬升油气界面的速度,延缓了气窜。但恒速N_2泡沫驱与泡沫段塞+后续水驱的提高采收率分别为28.59%和26.54%,明显高于N_2驱,这是因为泡沫破裂后N_2可以启动阁楼油,而表面活性剂能够剥离油膜,起到乳化、携带游离油滴的作用,所以N_2泡沫驱是更为有效的提高缝洞型碳酸盐岩油藏采收率的技术手段。When the Tahe oilfield steps into middle-late stages,it faces some problems such as lack of natural energy, short production plateau, high water cut of wells and low oil recovery. To solve these problems,this work developed three-dimensional fractured-vuggy carbonate reservoir model to conduct N2 flooding and N2 foam flooding for enhanced oil recovery （EOR） effect evaluation experiment. Experimental results show that water and gas （WAG） flooding can increase oil recovery by 25.92% which is higher than 23.46% of constant Nz flooding. The reason is that WAG flooding couht not only supply formation energy, but also suppress water coning. Meanwhile, the oil-gas interface was elevated and gas break through was delayed. The EOR of constant N2foam flooding and N2 foam plug ＋ water flooding is 28.59% and 26.54% respectively,which is higher than that of N2 flooding. The reason is that when foam crashed, N2 could start the attic oil and surface active agent could peel off the oil film,and emulsify and carry oil drop. Therefore N2 can be regarded as a more effective EOR technology for fractured-vuggy carbonate reservoirs.

关 键 词：缝洞型碳酸盐岩油藏 氮气驱 氮气泡沫驱 提高采收率 

分 类 号：TE357[石油与天然气工程—油气田开发工程]