到现在为止,在我国石油钻井的钻具组合中还未使用加重钻杆。不论是用转盘还是用井下动力钻具钻进直井或定向井,发生钻杆损坏的事故都比较多。早在六十年代初期,国外就在钻具组合中使用了加重钻杆。从现场使用情况来看,不仅联接在钻铤上的加重钻杆没有发生疲劳损坏现象,同时还延长了所有钻杆和钻铤的使用寿命。 Until now, heavy drill pipe has not been used in the drilling assembly of oil drilling in our country. Whether using the turntable or downhole power drill to drill a straight or directional well, the drill pipe damage occurred more accidents. As early as the early 1960s, heavier drill pipes were used abroad in the drilling assembly. From field use, not only does the weighted drill pipe attached to the drill collar experience no fatigue damage, it also extends the life of all drill pipes and collars.