Experimental Study on Lifting Technology of Hydraulic Driving Screw Pump

With the continuous development of oil fields, high gradient wells are increased year by year, highlight problem of high gradient wells is present in the low-volume oil wells. Low-volume wells in Dagang oil field land are mainly equipped with rod pump, with serious problem of partial grinding, short production cycle, and low pump efficiency. The the low-volume oil wells characterized by directional wells and horizontal wells in beach are mainly Equipped with ESP, and the trajectories of the wellbore are more complex than the land. The pump flow rate is less than that of the motor shell, the temperature rise of the unit, the motor burned, the cable breakdown and other problems are prominent in ESP lift, and production cycle is short. In view of the above problems, research on lift technology of hydraulic driving screw pump is carried out. the hollow screw is drived by the reverse circulation Power liquid, and the lifting efficiency is effectively improved. Through the test, The system can be adjusted in the range of 0.1-0.24L/s, to meet the production capacity of 10-20m3/d; the relatively constant ratio of power liquid and production Liquid is obtained in the system under different operating conditions, The results show that the whole structure can meet the requirements of large gradient wells or horizontal wells, achieving the production requirements of high gradient and low liquid oil wells.