A Study About Influence Law of Permeability on Gas Channeling of
CO2 Flooding Under Low Permeability Reservoirs

doi:10.11885/j.issn.1674-5086.2014.04.17.06

Abstract

Abstract:

In order to determine the influence law of permeability on CO2 flooding gas channeling in low permeability reservoirs， so as to screen suitable reservoirs for CO2 flooding experiment at Yanchang Oilfield，this paper has studied the characteristics of gas breakthrough time，gas channeling time，diffusion speed and changes of recovery at different stages under different permeability through laboratory experiment in combination with the actual mine conditions. Results show that the diffusion velocity increases with permeability，and gas breakthrough time and gas channeling time shorten with the increase of core permeability，and when permeability increases to a certain value（the value of this experiment is about 10 mD），breakthrough time and gas channeling time almost reduced to zero. The recovery when gas breakthrough decreases with increasing permeability. When permeability was within a certain range，gas channeling recovery and ultimate recovery first decrease with the increase of permeability，then rise slowly. There is significant space for recovery improvement after gas breakthrough of CO2 flooding in low permeability reservoirs，and huge quantities of crude oil is produced mainly after gas breakthrough and before channeling. But in the event of gas channeling，further recovery improvement will be extremely limited.

Key words: low permeability reservoir, permeability, CO2 flooding, gas breakthrough time, gas channeling time, recovery

Yang Daqing1, Shang Qinghua2, Jiang Shaojing2, Huang Chunxia2, Tang Ruijia2. A Study About Influence Law of Permeability on Gas Channeling of CO2 Flooding Under Low Permeability Reservoirs[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2014.04.17.06.

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A Study About Influence Law of Permeability on Gas Channeling of CO2 Flooding Under Low Permeability Reservoirs

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