Study on the surfactant in the development of energy storage net fracturing
Horizontal well energy storage volume fracturing combined with soak imbibition is the main way to improve the production of unconventional reservoir.Quantitative compari-son of oil displacement efficiency of imbibition fluid through analytical calculation of imbibi-tion dynamics and static visual imbibition experiment of multi-media reservoir at normal temperature and pressure,recognizing that surfactant play a two-way role in unconventional reservoir development and imbibition displacement.The positive role is to improve surface wettability and reduce residual oil saturation,but the effect is limited in depth and extent.The surfactant reduces the interfacial tension and greatly reduces the imbibition force,there-fore,it is difficult to change the wettability of fine-grained sedimentary rocks in unconven-tional reservoirs as micro-and nano-rocks in which crude oil is mainly distributed.The neg-ative effect of surfactant on the development of unconventional reservoirs is to reduce the oil-water interface tension,reduce the capillary force,reduce the imbibition power,and greatly reduce the imbibition and displacement efficiency of oil-water,and the higher the concentration of surfactant,the lower the efficiency of oil absorption and drainage.In order to play the role of surfactant in unconventional reservoirs,it is necessary to use nanoparticles as carriers to improve wettability and maintain a certain interfacial tension.The results can be used as a reference for the selection of injection media and methods in the development of tight oil and shale oil.
NETL
NSTL
万方数据
维普
