Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (4): 141-148.doi: 10.12108/yxyqc.20190415

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Improving water injection efficiency of transfer injection well in heavy oil bottom water reservoir

ZHANG Jilei, LUO Xianbo, ZHANG Yunlai, HE Yifan, ZHOU Yanbin   

  1. CNOOC Tianjin Branch, Tianjin 300459, China
  • Received:2019-02-23 Revised:2019-03-29 Online:2019-07-21 Published:2019-06-21

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Abstract: In view of the problems of poor flooding effect and ineffective circulation of most injection water in heavy oil bottom water reservoir under positive rhythm,the causes of the poor flooding effect of injected water in bottom water reservoir were analyzed. A method was put forward to build a dam by placing glue at the bottom of cone-shaped changing zone of permeability,and to expand the sweep volume of water injection in a bottom water reservoir. The key parameters of the dam were evaluated by numerical simulation and streamline simulation. The results show that the poor effect of injection water flooding in heavy oil bottom water reservoir is due to the effect of positive rhythm and large amount of liquid scouring on injection water after directional well injection,which forms a U-shaped tubular ineffective water cycle in the cone-shaped changing zone of permeability, bottom water zone and production well sweep zone. The technology of "gel dam" improves the flooding effect of injected water in heavy oil bottom water reservoir. The oil increasing effect of pilot test well group is obvious, the daily oil increment is 40 m3/d. This method changes the poor effect of water flooding in bottom water reservoir,and changes the water flooding in bottom water reservoir from "enough water injection" to "effective water injection". This new water injection model is of great significance for improving the flooding effect of water injection in heavy oil bottom water reservoirs.

Key words: transfer injection well, long-term scouring, streamline simulation, water injection efficiency, field application, heavy oil and bottom water reservoir

CLC Number: 

  • TE345
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