The mechanisms of thermal solidification agent promoting steam diversion in heavy oil reservoirs  

作　　者：Zhan-Xi Pang Qian-Hui Wang Qiang Meng Bo Wang Dong Liu 

机构地区：[1]State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing,102249,China [2]Liaohe Oilfield Institute,CNPC China,Panjin,124000,Liaoning,China [3]Henan Oilfield Institute,Sinopec China,Nanyang,473400,Henan,China [4]Tianjin Branch of China National Offshore Oil Company(CNOOC)Ltd.,Tianjin,300452,China

出　　处：《Petroleum Science》2024年第3期1902-1914,共13页石油科学（英文版）

基　　金：supported by National Natural Science Foundation of China(52074321);Natural Science Foundation of Beijing Municipality,China(3192026)。

摘　　要：At high cycles of steam huff&puff,oil distribution in reservoirs becomes stronger heterogeneity due to steam channeling.Thermal solidification agent can be used to solve this problem.Its solution is a lowviscosity liquid at normal temperature,but it can be solidified above 80℃.The plugging degree is up to 99%at 250℃.The sweep efficiency reaches 59.2%,which is 7.3%higher than pure steam injection.In addition,simultaneous injection of viscosity reducer and/or nitrogen foams can further enhance oil recovery.The mechanism of this technology depends on its strong plugging ability,which changes the flowing pattern of steam to effectively mobilize remaining oil.Viscosity reducer and nitrogen foams further expand the sweep range and extends the effective period.Therefore,thermal solidification agent can plug steam channeling paths and adjust steam flowing direction to significantly enhance oil recovery at high cycles of steam huff&puff.

关 键 词：Heavy oil reservoir Steam huff&puff Steam channeling Steam diversion Plugging performance Mechanism analysis 

分 类 号：TE357.44[石油与天然气工程—油气田开发工程]