Introduction to full bore plug valve: It is a full bore internal blowout prevention tool with a float valve. Once overflow, well kick or positive circulation stops during drilling or well repair, the valve plate closes under the action of the reset spring, cutting off the passage inside the drilling tool and achieving the purpose of preventing blowout inside the drilling tool

characteristic; Solved the problem of other drilling tool internal blowout preventers not being able to achieve full bore, it adopts a special valve plate structure design to automatically close under the action of fluid pressure inside the drilling tool. Under positive pressure conditions, the water hole is completely open, which can replace commonly used drilling tool internal blowout preventers at home and abroad. It has complete functions and is easy to use. The final diameter of the internal blowout preventer of the full bore drilling tool is 71.4mm, and inclinometers or other downhole instruments with an outer diameter less than 70mm can freely pass through, which can facilitate the handling of complex downhole drilling and the entry of other drilling auxiliary instruments through the water hole of the drilling tool, greatly saving drilling costs. Closing the pressure difference can be adjusted within an appropriate range, with reliable performance and strong corrosion resistance, improving well control safety