Evaluation on adaptability of residue sulfonate surface active agent to high temperature of fault block Jin-45

Based on measuring the solubility,interfacial tension,stability,absorption,and oil displacement efficiency of residue sulfonate in the high temperature oilfield of fault block Jin-45,the oil displacing performance of residue sulfonate in high temperature oilfields is studied in this paper.Research results show that the surface active agent has good solubility under Jin-45 reservoir conditions.Interfacial tension between it and the dehydrated crude of the block reaches as high as 10-3 mN/m.The absorption capacity of the agent on the core of fault block Jin-45 is less than 2 mg/g oil sand when the injection density is 0.3%.Spontaneous absorption recovery rate of 0.2% surface agent reaches 25%.Core displacement experiment conducted in the lab shows that recovery can be increased by 13% adding 0.3 PV into 0.2% surface active agent compared with water flooding.It is regarded that the surface active agent can be used to remarkably enhance recovery in reservoir of fault block Jin-45.