The Lab Experiment Comparison of Converting into Different Chemical Flooding after Water Flooding in the Stage of Different Water Cut in Untabulated Reservoirs

Abstract:

In order to optimize chemical displacing agents for untabulated reservoirs in Daqing oilfield, the natural cores were taken to conduct the physical simulation displacement experimental research with four displacing agents, which included active water with the weight content 0.1%, polymer solution with mass concentration 500mg/L and molecular weight 5 million, polymeric surfactant solution with mass concentration 500mg/L and molecular weight 5 million, binary compound system ( polymer with mass concentration 500mg/L and molecular weight 5 million , surfactant with weight content 0.1%). At different water cut stage of water flooding, the converting displacing agents were injected. The results showed that active water, polymer, polymeric surfactant, binary compound flooding all can enhance oil recovery to some extent; and for the same chemical agent, the earlier of the converting injection time, the higher of the degree of enhancing oil recovery. From displacement efficiencies of four kinds of displacing agents we can conclude that the effect of 0.8 PV polymeric surfactant is the best, following as that of 0.6875 PV binary compound system, that of 0.8 PV polymer and that of 0.5 PV active water. The experimental results of this paper can be used to direct oilfield exploitation practice.

• Periodical: Advanced Materials Research (Volumes 524-527)
• Pages: 1921-1924
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.524-527.1921
• Online since: May 2012
• Authors: Yan Fu Pi, Li Liu, Li Jun Bao, Kao Ping Song, Tao Zhang
• Keywords: Converting Injection Time, Physical Simulation Displacement Experimental, Polymer, Polymeric Surfactant, Untabulated Reservoirs

References

[1] Qimin Wang, Baofa Ji, Jun Sui,etc.. Practice and Knowledge of Tertiary Recovery Technique in Daqing Oilfield[J]. Petroleum Geology & Oilfield Development In Daqing in Chinese. 2001, 20(2):1-8.

[2] Wenxiang Wu, Yufeng Zhang, Jingqiang Hu, etc.. Physical Simulation Experiment of Polymer/Surfactant Flooding[J]. Journal of Daqing Petroleum Institute in Chinese. 2005, 29(6): 98-100.

[3] Bolin Li, Jiecheng Cheng. Research on Alkali-free Binary Displacement System[J]. Oil-gas Field Surface Engineering in Chinese. 2004, 23(6): 16-20.

[4] Abrams A. The Influence of Fluid Viscosity, Interfacial Tension and Flow Velocity on Residual Oil Saturation Left by Water Flood[J]. SPE 5050-PA, 1975.

DOI: 10.2118/5050-pa

[5] Lake L W. Enhanced Oil Recovery [M].U.S. Old Tappan: Prentice-Hall Inc, 1989.

[6] Putz A G, Lecourtier J M, Bruckert L. Interpretation of High Recovery Obtained in a New Polymer Flood in Chateau-renard Field[C]. SPE 18093–MS, 1988.

DOI: 10.2118/18093-ms