Screening of imbibition surfactant in inter-salt shale reservoir

Abstract

Under the current environment of low oil price, surfactant enhanced oil recovery technology is more economic and feasible without changing fracturing technology and adding special equipment. Surfactant enhanced oil recovery is induced by decreasing interfacial tension and changing wettability. However, there are many kinds of surfactant, and the reservoir conditions and rock types are different, so the first requirement of enhanced oil recovery is to select the surfactant which is suitable for the target reservoir. In view of the characteristics of high temperature and high salinity in inter-salt shale reservoir, in this paper, several surfactant types were selected and negative/non-composite surfactants were screened out by taking the adhesion work reduction factor related to imbibition resistance as the main index. This study is of practical significance for hydraulic fracturing reservoirs with surfactant enhanced oil recovery technology.