西南石油大学学报(自然科学版)

Previous Articles     Next Articles

A New Screening Evaluation Method for Candidate Reservoirs by CO2 Injection Miscible Flooding

Zhang Yanyu1*, Li Yanjie2, Sun Xiaofei1, Bai Xuzheng3, Su Yuliang1   

  1. 1. College of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China
    2. General Research Institute,CNOOC,Chaoyang,Beijing 10028,China
    3. Gudong Oil Production Plant of Shengli Oil Field Co. Ltd.,SINOPEC,Dongying ,Shandong 257000,China
  • Online:2015-08-01 Published:2015-08-01

Abstract:

Before the implementation of CO2 injection EOR project,screening evaluation of the candidate reservoirs can improve
the success rate and economic benefits of CO2 injection. Based on CO2 miscible flooding mechanism,this paper picks out
12 reservoir parameters and fluid parameters affecting CO2 injection miscible flooding results as comprehensive evaluation parameters
to screen out the candidate reservoirs. According to the investigation of a large number CO2 miscible flooding projects
at home and abroad,the quantitative method is determined by theoretical analysis,field experience and probability statistics.
Through calculating the combinational weight by improved AHP and entropy method and combining the advantages of TOPSIS(
Technique for Order Preference by Similarity to Ideal Solution)with gray relational analysis,the weighted GC TOPSIS
model is established to screen out the candidate reservoirs. This screening method was used to assess five classical candidate
reservoirs about CO2 injection miscible flooding. The results show that:by combined both subjective and objective impact,
this method can correctly evaluate the potential of CO2 miscible flooding of the candidate reservoirs.

Key words: CO2 miscible flooding, screening index, evaluation criteria, ideal solution, grey correlation