西南石油大学学报(自然科学版)

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Research on CO2 Flooding Parameters Optimization of Extra-low
Permeability Reservoirs

Wang Huan, Liao Xinwei, Zhao Xiaoliang   

  1. School of Petroleum Engineering,China University of Petroleum(Beijing),Changping,Beijing 102249,China
  • Online:2014-12-01 Published:2014-12-01

Abstract:

The Chang-6 formation of Block Wangyao in Ansai Oilfield belongs to the extra-low permeability reservoir. Currently,
it has entered the high water-cut stage. It is difficult to further enhance recovery by water flooding. However,CO2
flooding is an important EOR approach in extra-low permeability reservoir,which can compensate for the disadvantages of water
flooding. Taking the Chang-6 of Wangyao extra-low permeability reservoir for example,this paper analyzes the geological
features of the block and the problems in water flooding development,and optimizes the CO2 flooding pattern fitting for the
pilot area by applying geological modeling and reservoir numerical simulation techniques,and further optimizes the parameters
of formation pressure,production rate,water alternating gas time,shut-in gas-oil ratio and total gas injection volume. The
results of this study will offer basic parameters of CO2 miscible flooding to the construction and implementation of field test.
It also provides reference to implement action of CO2 flooding technology to the entire Ansai Oilfield.

Key words: extra-low permeability reservoirs;Chang&ndash, 6 formation;CO2 flooding;numerical simulation;parameter optimization