Patent ID: 7028788
Filing Date: 2006-04-18
Classification: E21B

Abstract:
1. In combination, a first drill pipe having of predetermined outer diameter having a section at one end thereof of a reduced diameter from said predetermined diameter, a thread on said section and a plug of conical shape extending from said section; a second drill pipe of predetermined outer diameter having an internally threaded conical bore threadably receiving said plug of said first drill pipe; and a wear sleeve having an outer diameter greater than said predetermined outer diameter of said first drill pipe and said predetermined outer diameter of said second drill pipe and defining a single continuous uninterrupted peripheral wear surface extending circumferentially about said sleeve and projecting radially beyond said first pipe and said second pipe, said wear sleeve extending over said section of reduced diameter of said first pipe and abutting said second drill pipe, said wear sleeve having an internally threaded section extending axially thereof and threaded onto said thread of said first pipe.