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Experimental study on gas channeling problem of N2 foam flooding
LI Zhaomin1, ZHANG Xibin1, LI Songyan1, WANG Hongyu2, LI Binfei1, LU Teng1
(1.School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;2.Bohai Petroleum Research Institute, Tianjin Branch of CNOOC Limited, Tianjin 300452, China)
Abstract:
The gas channeling problem happens often during the foam flooding for enhancing oil recovery. In order to define the gas channeling opportunity and degree, the index number of gas production rate Ig was proposed. The influences of surfactant concentration, injection manner, injection rate and oil saturation on the N2 foam flooding were investigated through physical simulation experiments. The results show that the high foam surfactant concentration can cause a high strength of liquid film, in which the function of liquid film flowing can reduce the chance of gas channeling. Compared with the slug injection and gas/liquid injection, the foam from generator has a better quality and has less chance of gas channeling. It is also found that low velocity of injection causes the gas channeling easily. However, when the velocity is above the certain value, the blockage ability of foam becomes stable. The Ig value of 0.5 is defined as the critical gas channeling point, above which the gas channeling will happen.
Key words:  N2 foam flooding  gas channeling  affecting factor  index number of gas production rate  critical gas channeling point