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Simulation experiment of foam plugging outside channeling of heavy oil well
YANG Hao, YUE Xiang-an, ZHAO Ren-bao,YANG Zhao-peng
(MOE Key Laboratory of Petroleum Engineering in China University of Petroleum, Beijing 102249 r China)
Abstract:
In order to decrease the damage to oil layer, foam was employed to plug outside channeling of heavy oil wells. A physical model of outside channeling in different pressure systems was established. The flow law of liquid of outside channeling and the influence of injection method on plugging effect were analyzed. The breakthrough pressures and plugging efficiencies of core and sandpack column were evaluated,and the core and sandpack column selectively simulate water/oil bed and channeling passageway- The results show that the injection effect of gas-liquid-gas is the best. The injected gas can raise reservoir pressure higher than that of water channeling bed and press water channeling. Owing to difficult injection in heavy oil reservoir, existing of capping formation, difficult separation of gas and heavy oil and channeling water saturated depletion of reservoir, the pressure of oil bed is higher than that of water channeling bed. Injected fluids mainly turn to water channeling formation, and good plugging effect can be obtained.
Key words:  foam  plugging  outside channeling breakthrough pressure  plugging efficiency  simulation experiment