Reservoir Evaluation and Development ›› 2020, Vol. 10 ›› Issue (3): 51-59.doi: 10.13809/j.cnki.cn32-1825/te.2020.03.008

• Field Application • Previous Articles     Next Articles

Present situation and further research direction of CO2 flooding technology in Shengli Oilfield

CAO Xulong,LYU Guangzhong,WANG Jie,ZHANG Dong,REN Min   

  1. Sinopec Shengli Oilfield Company, Dongying, Shandong 257000, China
  • Received:2020-01-20 Online:2020-06-26 Published:2020-07-03


CO2 flooding is effective for enhancing the oil recovery in low permeability reservoir and reducing the greenhouse gas emissions. In order to solve the technical problems of difficult miscible phase, easy gas channelling and low sweep coefficient for CO2 flooding in low permeability reservoir in Shengli Oilfield. By the combination of physical and numerical simulation, the development mechanism of the CO2 injection miscible flooding long in advance is clarified, and the comprehensive techniques for extra low permeability reservoir is formed. After field application, the stimulation effect is obvious, the daily production of oil per well increase by 5 times. The principle and technical idea of reducing the miscibility pressure are put forward, and the system of reducing the miscible pressure system is developed, which can make the pressure decrease by up to 22 %. The challenge and countermeasure faced by scale application of CO2 flooding in Shengli Oilfield are analyzed, and the development directions of CO2 flooding are proposed, such as deepening the phase state theory of oil recovery enhanced by CO2 flooding, developing CO2 flooding technology with expanded sweep volume at low cost, developing incomplete CO2 miscible flooding, and description and early warning of gas channeling. All these provide technical support for oil field to realize scale application of CO2 flooding.

Key words: advanced gas injection, ultra-low permeability reservoir, reduce miscibility pressure, CO2 miscible flooding, development direction

CLC Number: 

  • TE357.42