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Lyu, X. (author), Liu, Huiqing (author), Pang, Zhanxi (author), Sun, Zhixue (author)Steam channeling, one serious problem in the process of steam flooding in heavy oil reservoir, decreases the sweep efficiency of steam to cause a lower oil recovery. Viscosity reducer and nitrogen foam, two effective methods to improve oil recovery with different mechanism, present a satisfactory result after steam flooding. In this article,...journal article 2018