Boring or penetrating the earth – With tool shaft detail
Patent
1990-01-04
1991-01-29
Neuder, William P.
Boring or penetrating the earth
With tool shaft detail
138DIG11, 138 44, 138109, 138172, 138177, 138178, E21B 716
Patent
active
049879618
ABSTRACT:
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 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.
REFERENCES:
patent: 3827511 (1974-08-01), Jones
patent: 4051906 (1977-10-01), Donegan
patent: 4361193 (1982-11-01), Gravely
patent: 4435972 (1984-03-01), Simon
patent: 4760889 (1988-08-01), Dudman
patent: 4771811 (1988-09-01), DeCell et al.
"North Sea Experience with Aluminum Drill Pipe", Offshore Technology Conference, May 1989, B. A. Tarr and I. A. Graham (pp. 178, 180).
"Hevi-Wate Drill Pipe", Drilco Copyright 1980, Smith International, Inc.
Hayden Jack W.
Neuder William P.
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