铝合金钻杆与钢接头可靠连接过盈量的计算及组装工艺

铝合金钻杆具有密度小、比强度高、耐腐蚀性强等优点，但其耐磨性较低。实际使用时，将铝合金钻杆杆体与钢接头组装在一起形成钻杆柱，由钢接头来承受拧卸操作。由于铝合金与钢在弹性模量、热膨胀系数、屈服强度等方面的差异，经常出现连接不可靠的情况。针对饱147 mm ×13 mm的内加厚铝合金钻杆进行过盈量的理论计算，得出满足传递载荷及材料不产生塑性变形的过盈量范围是0.712～1.009 mm。同时对钻杆杆体及钢接头的组装工艺进行介绍。

Calculation of Interference in the Reliable Connection of Aluminum Drill Pipe and Steel Tool Joint

Aluminum drill pipe has the advantages of low density, high specific strength and strong corrosion resistance, but the wear resistance is low.In the practical application, the aluminum drill pipe body and steel tool joints are assembled together to form a drill string, the steel tool joints are used to withstand the screwing and unloading operation.Because of the differences of aluminum and steel in the elastic modulus, thermal expansion coefficient and the yield strength, the unre-liable connections often happen.The theoretical calculations of interference are made on aluminum drill pipe with internal upset, which has the diameter of 147mm and wall thickness of 13mm, the interference range should be 0.712~1.009mm to meet transfer load without plastic deformation.The paper also introduces the assembly process of drill rod and steel joint.