Petroleum Reservoir Evaluation and Development ›› 2021, Vol. 11 ›› Issue (6): 864-870.doi: 10.13809/j.cnki.cn32-1825/te.2021.06.010

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CO2 flooding development models and economic benefit evaluation of different types of reservoirs in Subei basin

WU Gongyi(),ZHAO Ziping,WU Bo   

  1. Taizhou Oil Production Plant, Sinopec East China Oil and Gas Company, Taizhou, Jiangsu 225300, China
  • Received:2020-04-07 Online:2021-12-26 Published:2021-12-31

Abstract:

CO2-EOR has been widely used in foreign countries, but rare in China because of technical and economic factors. Taking the CO2 flooding project of the small fault block reservoir in Subei basin as an example, the development modes of huff-n-puff, synchronous gas injection, gas cap flooding, gas-water alternation, CO2 combined flooding in medium and high permeability reservoirs are summarized, and economic benefits and influencing factors are analyzed. The practice in Subei basin shows that the economic benefits of CO2 flooding projects are closely related to the injection cost and utilization of CO2. The economic benefits of various development models are different but overall are good, which play a better performance in low permeability and low water cut oil reservoirs through gas cap flooding and gas-water alternate flooding.

Key words: low permeability reservoir, mid-high permeability, CO2 flooding, CO2 composite flooding, Subei, economic evaluation

CLC Number: 

  • TE341