| 摘要 |
<p>A tubular drill pipe having a pin connector (10) at one end and a box connector (12) at the other end has each connector adapted to mate with a connector similar to that at the opposite end of the pipe-- but on another pipe, to form a tool joint. The connectors are of the type having two pair of axially abutting make-up faces: a primary annular shoulder (18) formed at the inner end of the base (16) of the pin connector (10), which mates with the end face (40) of the box connector (12) to form a first such pair; and an internal secondary shoulder (28) at the inner extremity of the base (30) of the box connector (12) which abuts the end of the outermost nose section (26) of the pin connector. The (a) length (Lpc) of the threaded section (22) of the pin, (b) the transverse cross-sectional area of the pin nose (24), and the smaller of (c) the transverse cross-sectional area of the box counterbore section (38), and (d) the transverse cross-sectional area of the last engaged thread (unnumbered) of the pin are correlated, so that the torsional strength of the joint is approximately equally dependent on each of (a), (b) and the smaller of (c) or (d).</p> |
