Study and application evaluation of blending lean oil technology in Bohai Q oilfield
WANG Da-wei1,2, JING bo1,2, LIANG Shou-cheng1,2, ZHANG Shi-lun1,2, ZHANG Jian1,2, TAN Ye-bang3
1. State Key Laboratory of Offshore Oil Exploitation, Beijing 100027, China; 2. Tech R&D Center, CNOOC Research Institute Co., Ltd., Beijing 100027, China; 3. School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
Abstract: There exist problems in Bohai Q oilfield,such as higher crude oil viscosity and lower recovery rate.The feasibility to employ the blending lean oil into heavy oil technology in Q oilfield is studied.Firstly,the basic properties of heavy oil and lean oil from Q oilfield are determined.Then the viscosity reduction experiments by the blending proportion,moisture content,temperature and shear rate are carried out.By taking into account the cost of lean oil and the efficiency of viscosity reduction,the appropriate blending manner and proportion is selected to explore the feasibility of using lean oil to reduce the viscosity of heavy oil and enhancing oil recovery.The results show that the viscosity of heavy oil system blended with lean oil decreases with the increasing temperature or moisture content.The appropriate proportion of heavy oil to lean oil is determined as 8:2.Low injection rate of lean oil can enhance oil recovery in the early stages of oilfield development when the moisture content in oil remains low.Actually,the proportion of heavy oil and lean oil in Q oilfield is exactly 8:2,which closes to experiment results.Therefore,judging from the perspective of potential reserves,the blending technology has application value in early development stage of Q oilfield.
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