公开(公告)号：CA2791599C

公开(公告)日：2017-09-19

申请号：CA2791599

申请日：2012-10-03

Applicant: WEATHERFORD/LAMB INC

Inventor： HASHEM GHAZI J ,  BRUNNERT DAVID ,  KOCHERA JOHN W ,  MITCHELL MARK ,  FRILOT MELISSA A ,  REDLINGER THOMAS M

IPC: E21B17/00 ,  E21B17/06

Abstract: The present invention describes a drill pipe in which various sections of the pipe are strengthened, or their shape is altered, in order to improve the wear and buckle resistance of the drill pipe. The sections are strengthened using various hardening methods such as heat treatment processes and/or expansion techniques. A sleeve can also be applied to the strengthened portions. Surface enhancers, such as hardbanding, can be applied to the strengthened portions or the sleeve in order to provide abrasion resistance or to reduce friction.