Abstract: Flowing-pumping integrated wellhead were adopted in some wells in the Tahe oil field so as to reduce production cost and pumping operation when self-flowing wells turned to pumping during the late production period. However, there exist well control risks. A new well-hole sealing device for flowing-pumping integrated well completion was innovated to enhance the pressure resistivity and reliability of wellhead. It saved costs for emergent well killing and wellhead replacement when overpressure occurred.