Main Types and Characteristics of Premium Threads of Foreign Oil Well Pipes

Described here in the paper are the connection types and structures of several major commonly-manufactured/used foreign premium threads of oil well pipes namely, TM, SE-EF, NK3SB, NSCC, SEC, VAM, BDS and FOX. Also discussed are the characteristics/advantages/applications of these premium threads. Predicted is the orientation of developing domestic IPR-owning and brand premium threads of oil well pipes.