Pipe joints or couplings – Molded joint – Weld
Patent
1998-05-01
2000-01-11
Arola, Dave W.
Pipe joints or couplings
Molded joint
Weld
285333, 285422, 403343, 29469, F16L 1302
Patent
active
060127449
ABSTRACT:
A heavy weight drill pipe member is disclosed for use in drilling high angle and horizontal well bores in a corrosive environment. The heavy weight drill pipe member consists of a tubular member with a longitudinal bore therethrough, and includes connectors or tool joints attached at each distal end for connecting additional heavy weight drill pipe members. The tubular member and tool joints are preheated, water quenched and tempered to obtain a unique combination of hardness, a yield strength and impact strength for improved resistance to stress corrosion cracking and hydrogen embrittlement in a hydrogen sulfide environment. The tubular member includes a plurality of wear pads or protectors equidistantly spaced along the longitudinal axis of the tubular member to reduce bending stress in the pipe by limiting the degree of bend when the pipe is placed in compression in a high angle well bore. To reduce the chances of differential pressure sticking of the pipe when the pipe is used in high angle or horizontal well bores, each wear pad or protector is provided with spiral grooves therein. Each wear pad or protector may also be hard faced or hard banded to reduce wear.
REFERENCES:
patent: 3773359 (1973-11-01), Chance et al.
patent: 3784238 (1974-01-01), Chance et al.
patent: 4416476 (1983-11-01), Garrett
patent: 4460202 (1984-07-01), Chance
patent: 4811800 (1989-03-01), Hill et al.
Grant Prideco brochure on Heavyweight Drill Pipe.
Moore R. Thomas
Tang Wei
Wilson Gerald E.
Arola Dave W.
Grant Prideco, Inc.
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