Research and practice of deep-buried heavy oil lifting nique in Tahe Oil Field

The deep-buried fractured vuggy carbonate reservoirs in the Tahe Oil Field locate 5 300-6 600m deep,with the formation temperature of 128-300℃(5 600 m) and the thermal gradient of 2.2℃/hm.Crude oil from the reservoir has strong heterogeneity and complex property.It is characterized byhigh salinity,high HZ S content,high viscosity,high density and high wax content.Due to the above-mentioned features,the lifting technique of deep-buried heavy oil should take into consideration of sever-al aspects.Through research,practice,conclusion and re-practice,a set of lifting and associated tech-nique has been proposed,including thin oil mixing and chemical ways to reduce viscosity,electricalheating,heavy oil pump,electric submersible pump and compound lifting.