Technology of Decreasing Injection Pressure and Increasing Injection Rate by Surfactant in TB Block of Xingnan Oilfield

Abstract

During water flooding of the TB block of Xingnan oilfield, some problems which influence development effect exist usually, for example, the rapidly-increasing pressure in injecting wells and the rapidly-decreasing pressure in producing wells. In this paper, the petroleum sulfonate was selected as the main chemical agent, assisted by various additives. By IFT measurement of oil and surfactant solution and core simulation displacement experiment, the chemical agent formula used for decreasing injection pressure and increasing injection rate was developed, and the injection parameters were optimized. The results show that the IFT between the TB block oil and formula system is 6.29×10-3mN/m, the best concentration of agent is 0.5%, the best injection volume is 0.5PV, the ratio of decreasing injecting pressure is 25.70%.