Research on Gas Channeling Law and Sealing Strategy of Hydrocarbon Gas Drive in Offshore Oilfield
According to the development status of hydrocarbon gas flooding stage in an oilfield in the South China Sea,a typical well group conceptual model was established to analyze the influencing factors and main controlling factors of gas channeling degree,considering the characteristics of large dip angle,complex fault block and heterogeneous.Through the optimized gas channeling plugging control technology,the technical adaptability was analyzed by taking oil increment as index,and gas channeling plugging strategy chart was obtained.The results showed that hydrocarbon gas flooding was classified as immiscible flooding,the main factors affecting gas channeling were formation dip angle,reservoir thickness and source direction,the main factors affecting gas channeling were gas injection intensity and injector-producer distance,and the main factors affecting hydrocarbon gas flooding recovery were permeability difference and gas injection location.The adaptability analysis of dynamic allocation,foam injection and gel injection were conducted.The plugging strategy of dynamic allocation or foam injection was formulated for well groups with favorable source or low injection and high production,foam+gel method was adopted for heterogeneous well groups,and foam or foam+gel method was adopted for fault blocked well groups.
Offshore oilfieldHydrocarbon gas floodingNumerical simulationGas channeling lawPlugging strategy chart
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