Can clean well drill pipe coupling

The utility model provides a can clean well drill pipe coupling, it is mainly by the slope, the coupling pipe wall, the internal thread, the draw-in groove, ' V' type runner forms the slope lies in the coupling both sides, roughly becomes 30 degree with the horizontal plane, can prevent that the coupling section from taking place sticking of tool accident and reducing fluid energy loss the coupling pipe thickness has determined the tensile strength of coupling, drilling rod around the internal thread is used for connecting when last coupling, the draw-in groove plays the effect of fixed coupling, and its both sides slope also can prevent sticking of tool occurence of failure' V' type runner can change the fluid flow to to make the fluid form high-speed rotating flow. The fluid flow is when the coupling, and inclined plane and coupling outer wall towards preceding flow are followed to partly fluid, another part fluid flow through' behind V' the type runner, the flow direction changes, forms high-speed rotating flow, assaults the anterior detritus bed of coupling, plays the effect that purifies the anterior well of coupling the utility model discloses simple structure, convenient to use, anterior well purification efficiency is high to the coupling, has guaranteed going on smoothly of well drilling work progress