采用适当的变螺距工艺可使扣牙力分布得以改善，从而提高套管柱承载能力。
Proper variate thread pitch techniques can be adopted to improve the distributions of detention forces, so as to strengthen casing strings'loadsupporting capability.
认为产生粘扣的主要原因是螺纹齿面局部过量的塑性变形，通过变锥度的方式能使接触应力分布规律得到改善，并在现场生产中得到验证。
The results showed that the major cause of thread gluing is over plastic deformation of partial thread face, and that the distribution of contact stress can be improved with the taper mutation, wh...
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