Influence of residual agent content on stability of produced fluid in profile control

Abstract

Profile control technology as an effective technology has been widely used in oilfield production in recent years. However, the effect of chemical injection in profile control process on the stability of produced liquid is not clear. Therefore, based on the existing technology, this paper studied the influence of residual profile control agent (alkali, surfactant, polymer) in produced liquid on the stability of produced liquid with the subject of an oilfield in the South China Sea(EP). The results showed that due to the interaction between the residual agent and crude oil, the residual drug dose in the produced fluid should be controlled at 2-3 × 10−4wt, and the absolute value of zeta potential increases the fastest, the absolute value of zeta potential is within 5.5 mV and the interfacial tension is greater than 1.75 mN/m. The diameter of oil droplets in water reaches the maximum value of 12.31 μm, and the oil content in water and the water content in oil are lower than 50%.