【摘要】 笔者在查阅国内外有关资料和深入现场进行大量调研的基础上,对钻铤螺纹各种早期破坏形式进行归类,并对发生早期破坏的原因进行了分析。文末笔者对这一课题的深入研究提出了几点建议。更多还原

【Abstract】 On the basis of referring to some home and foreign research results and extensive investigations, the authors in this paper describe the classification of various early damages occurring to the threads of drill collars and analyse the causes for the early damages. And at the end of the article, the authors represent some suggestions for further researches on the abovediscussed subject.更多还原