Research on Surfactants of Low Temperature and High Salt Oil Deposit Oil Displacement on Block D

Block D belongs to low-temperature high-salt oil deposit with low recovery percent of reserves, long edge and bottom water. Aiming at this block, we designed and developed alkali-free binary composite flooding QA series surfactants for oil displacement. With field water as the experimental water, a lot of exploratory experiments have been carried out to filtrate, prescribe and advance the surfactant. Finally, QA series surfactant suitable for the characteristics of low temperature and high salt deposit on Block D was successfully developed. In the oil-water system of D block, QA series surfactant shows some good features like ultra-low interfacial tension, strong adsorption resistance and good calcium resistance. It is successfully applied in the field and the effect of EOR is remarkable.