Research and Application of Chemical Strengthening Cold Recovery Technology for Heavy Oil

摘要

In view of the current situation of high recovery, high water cut and low oil recovery speed in Shengli Oilfield, an enhanced cold-collecting viscosity reduction system with reduced viscosity washing effect was developed. The viscosity reduction performance, crude oil matching performance and oil sand elution performance of the system were obtained. And the model oil displacement effect was evaluated. The results show that the viscosity reduction system can reduce the viscosity of heavy oil in different reservoirs by more than 90% under micro-power, and the conventional viscosity reduction rate is over 99%; The system has good oil sand elution performance, and the oil sand elution rate of different oil heavy oils reaches over 91 %. The research on the effect of physical model oil displacement shows that the system can improve the heavy oil displacement efficiency of 2# well by 15.5% and the water content by 10%. The numerical simulation study of the well shows that when the system concentration is 0.5%, the optimal injection amount is 800t. In the Hekou Oil Production Plant, the Gudong Oil Production Plant, the Binnan Oil Production Plant and the Xianhe Oil Production Plant, each well was screened for field test, and all of them achieved good oil and precipitation effects and were of great value.