Tenaris Connections B.v.

Nkk Tubes

Tomoyuki Narikawa

Nobuo Kobayashi

Tatsuo Ono

Toshihiko Fukui

Motohisa Yoshida

Koji Sakura

Takeshi Kuwano

Nobuhide Sato

Toshihiko Fukuri

Disclosed herein are embodiments of a drill pipe tool joint and a drill pipe which are optimized for repeated make-up/break-out operations without the use of screw grease. Embodiments of the disclosure are environment friendly as well as having improved operating efficiency. In particular, the box and pin can be formed from different materials having different hardness.

Galling resistant drill pipe tool joint and corresponding drill pipe

Growing community of inventors

Kawasaki, Japan

Tomoyuki Narikawa