Reservoir Evaluation and Development ›› 2020, Vol. 10 ›› Issue (2): 128-134.doi: 10.13809/j.cnki.cn32-1825/te.2020.02.022

• Conventional Oil and Gas • Previous Articles    

Application method of determining polymer injection timing with relative permeability curves

ZHU Shijie1,SHI Leiting1,ZHANG Jian2,LI YanLi3,WANG Gang3,XUE Xinsheng2,YE Zhongbin1   

  1. 1.State Key Laboratory of Oil & Gas Reservoir and Exploitation Engineering, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2.State Key Laboratory of Offshore Oil Exploitation, Beijing 100027, China
    3.Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
  • Received:2019-09-17 Online:2020-04-26 Published:2020-04-28

Abstract:

The early polymer injection technology can further improve the polymer flooding effect, and the method to judge the time of polymer transfer by laboratory experiment and numerical simulation is relatively complex and limited in application. Based on the mechanism of oil-water relative permeability, an application method for quickly determining the time of injection and accumulation is established by using reservoir engineering method. The characteristics of the relative permeability curves of four reservoirs are obtained through laboratory experiments, and the influence of the water cut change rule, water cut rise rate, dimensionless production fluid(oil) index, oil-water mobility ratio and other characteristic parameters on the injection timing of polymer flooding under different reservoir conditions is analyzed by the reservoir engineering method. The results show that the above characteristic parameters are obviously different under different reservoir conditions. The injection time of polymer flooding should be determined by sorting the characteristic parameters according to the actual demand. Taking production as an example, the dimensionless production index, dimensionless production index, water cut rising rate and oil-water flow rate ratio determine that the water cut of the injection time for four reservoirs(BZ, JZ, QHD and SZ) is above 80 %, 79.9 %, 86 % and 34 %, respectively. According to the actual situation of the field, the time of polymer injection time can be determined quickly by analyzing the relative permeability curve with reservoir engineering method.

Key words: reservoir engineering, relative permeability curve, mobility ratio, injection time, polymer flooding

CLC Number: 

  • TE357