| 摘要 |
DRILL STEM MEMBER, ARRANGEMENT AND METHOD A member (M) provides a preferred combination of reduced weight with increased resistance to buckling under compressive loading and includes a tubular member (10) with tool joints (TJ) at each end for connection to form a drill stem. The tubular member (10) further includes a first portion or pipe section (15) adjacent either one of the tool joints (TJ)and may include a second portion or pipe section (15') adjacent the other tool joint (TJ) which are of smaller or reduced diameter than the adjacent tool joint. An enlarged portion (20) extends longitudinally of the tubular member from adjacent the first portion to adjacent the second portion where there is a second portion adjacent the other tool joint. If there is only one first portion adjacent one tool joint, the enlarged diameter extends from adjacent such first portion to the tool joint at the other end of the tubular member. The enlarged portion (20) has a larger inner and outer diameter than the adjacent first portion.
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