Development of Offshore Submersible Electric Pump and Application in Bohai Oilfield

some low-liquid wells are facing difficulties in production due to the lack of suitable lifting methods. In order to solve the exploitation problems of this kind of wells, a linear submersible electric pump with balance buffer, sand scraping device and track spring reset double fixed globe valve is designed and developed for offshore oilfields, aiming at the low production wells which are of high deviation, sand production and high power. The developed linear motor reciprocating pump consists of linear motor, reciprocating pump, cable and special frequency converter cabinet for linear motor, and its lift force capacity reaches 60 kN. The application in Bohai oilfield shows that the developed offshore linear submersible electric pump is suitable for the exploitation of low production wells in offshore oilfields and successfully solves the exploitation problem of low production liquid wells.