High Quality Box-Box Box-Pin Pin-Pin Gunite Drilling Subs

Shotcrete shorting is a device used for directional drilling through, which is designed to reduce the friction on the drill pipe and improve the construction efficiency. The short side wall is provided with two symmetrical adjustable relief valves, each consisting of a vertical hole and a diagonal hole, which are communicated. The overflow control component composed of steel ball, spring and pressure ring is provided in the vertical hole, while the nozzle is provided in the inclined hole. This design can effectively solve the problem of drilling cuttings accumulation in the hole during the long distance horizontal directional drilling through the process, reduce the appearance of drill pipe mud, reduce the torque of drill pipe, avoid hole wall wear drill pipe, thereby improving the service life of drill pipe and reducing economic investment