Abstract
In order to screen out fracturing fluid system with enhanced oil recovery performance, performance experiments of three surfactants blended with low concentration guar gum fracturing fluid used in fracturing technology of Daqing Oilfield are conducted. The performance experiments include interfacial tension test, emulsifying performance test and wettability reversal experiment. Interfacial tension values of different surfactant concentrations are tested. Water separation rates of emulsion in nine liquid systems are tested. The wettability of 36 cores is tested. It is concluded WPS and LCG composite fracturing fluid system has the lowest interfacial tension and stable emulsifying property, also reverses the wettability of hydrophilic core and increases the wettability of hydrophilic core.
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