Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (2): 139-145.doi: 10.12108/yxyqc.20180215

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Efficiency improvement of CO2 flooding in middle and later stage for low permeability reservoirs

MA Li1, OUYANG Chuanxiang1, TAN Zhengyang1, WANG Changquan1, SONG Yan2, LIN Fei3   

  1. 1. College of Petroleum Engineering, Yangtze University, Wuhan 430100, China;
    2. PetroChina Jilin Oilfield Company, Songyuan 138000, Jilin, China;
    3. No.1 Gas Production Plant, Sinopec Southwest Oil/Gas Company, Chengdu 610000, China
  • Received:2017-11-03 Revised:2018-01-12 Online:2018-03-21 Published:2018-03-21

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Abstract: In order to solve the problems of low opening rate caused by directional gas channeling in the middle and later stages of CO2 flooding development in low permeability reservoirs, poor overall development results and potential safety issues, numerical simulation and laboratory experiments were used to analyze the effects of anti-controlled gas channeling, to ensure the production rate of oil wells and other technical methods. The results show that the CO2 of water-gas alternating is more uniform and the oil recovery efficiency is better than that of gas injection, wheel injection and continuous gas injection. When the monthly CO2 injection-production ratio is 1.7 to 1.8, it can simultaneously maintain the mixing capacity and prevent gas channeling, so as to decrease water cut and increase oil production. In view of gas channeling characteristics of oil well, different flow pressure control standards were formulated to maximize the CO2 flooding effect. The pressure field changes can be adjusted by periodic oil recovery, which can increase the frequency of oil and gas contact to promote mixed phase and expand the volume of CO2. The periodic oil recovery effect of typeⅠgas wells is better than that of type Ⅲ gas wells and the continuous oil recovery. The safety production is effectively guaranteed by adjusting the injection production ratio and controlling the reasonable production pressure difference, installing the wellhead control valve and setting up wellhead single well tank regular pressure relief. The results can provide technical reference for the development of CO2 flooding test and promotion in Jilin Oilfield and the same kind of oil reservoirs in China.

Key words: AVO technology, Zoeppritz equation, approximate solution, forward modeling

CLC Number: 

  • TE38
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