Key Technology and Development Trend of Surface Engineering for Heavy Oil Reservoir in Liaohe Oilfield

Heavy oil produced from Liaohe Oilfield has the characteristics of high viscosity and density,low oil/gas ratio,abundant colloid and asphaltene as well as high sensitivity of viscosity-temperature.Faced with the problems,Liaohe Oilfield has step by step built up a particular technology of surface gathering and supporting system through many year’s exploitation and construction.In this article,the following techniques developed by Liaohe Oilfield are introduced: the typical heavy oil gathering progress flows such as single pipeline heating gathering and double-pipeline water-mixing gathering,the key heavy oil processes such as hermetic dehydration with thermochemistry sedimentation + electrochemistry,and the dehydration with two stage thermochemistry sedimentation,the deep processing of heavy oil produced water,and the key technique of SAGD gas injection system.In order to adapt for the change in heavy oil exploitation ways,the development trends of heavy oil gathering and treatment and the relevant problems to be solved in the future are discussed.