Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (5): 102-106.doi: 10.3969/j.issn.1673-8926.2014.05.019

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Comprehensive treatment of gas channeling at the later stage of CO2 flooding

CHEN Zuhua1，TANG Yong2，WANG Haimei1，CHEN Yuhan1
  

  1. 1. Sinopec Huadong Branch Company， Nanjing 210011， China； 2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Southwest Petroleum University， Chengdu 610500， China
  • Online:2014-10-20 Published:2014-10-20

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Abstract:

It is difficult for the field to achieve the CO2 miscible flooding efficiency of indoor experiments which could reach more than 90%. Recovery factor is limited mainly by several aspects, namely, CO2 viscous fingering, gravity overlap and reservoir heterogeneity, which exert negative influence on CO2 sweep efficiency. On the other hand, gas channeling aggravates gradually and development conflicts intensify continuously at the later stage of production. This paper analyzed development effect of CO2 flooding, regarding layer series of development, injection-production structure, way of injection and injection profile, moreover, proposed technologies of strata subdivision, injection in the top, water alternating gas（WAG）, polymer profile control and CO2+foam flooding. Good response has been observed after the onsite implementation. Reservoir overall gas-oil ratio decreased from 2 733.1 m3/m3 to 63.84  m3/m3, and daily oil production increased from 30.72 t（before gas injection） to 81.68 t（after gas injection）. Generally, this anti-gas channeling comprehensive technology is of great significance for similar reservoir scenario design and gas channeling prevention.

Key words:  low permeability reservoir, reservoir characteristics, genesis analysis, compaction, Gaoyou Sag

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