| 摘要 |
<p>A downhole tool (10) for insertion in a dril stem (11) includes elongated cylindrical half sleeve tool sections (18, 20) adapted to be non-rotatably supported on an elongated cylindrical body (12). The tool sections (18, 20) are mountable on and removable from the body (12) without disconnecting either end of the tool (10) from a drill stem (11). The half sleeve tool sections (18, 20) are provided with tapered axially extending flanges (30, 36) on their opposite ends which fit in corresponding tapered recesses (32; 62, 16) formed on the tool body (12) and the tool sections (18, 20) are retained on the body (10) by a locknut (52) threadedly engaged with the body (12) and engageable with an axially movable retaining collar (50). The tool sections (18, 20) may be drivably engaged with axial keys (44) formed on the body (12) or the tool sections (94, 96) may be formed with flat surfaces (136) on the sleeve inner sides cooperable with complementary flat surfaces (84) formed on a reduced diameter portion (82) of the body (72) around which the tool sections (94, 96) are mounted.</p> |
