Drill string drill collars

Details Drill string drill collars Drill string drill collars

1988-01-25

1989-10-10

Novosad, Stephen J.

Boring or penetrating the earth

With tool shaft detail

148 12E, 138DIG6, 166902, E21B 1716

Patent

active

048725196

ABSTRACT:
Improved drill collars and their manufacture include the assembly of a body member formed of an appropriate high strength material, and a liner within the body. The body member will provide the majority of the strength and weight required of the drill collar, while the liner will be constructed of a material offering improved resistance to corrosion and stress corrosion cracking. The liner may be formed of a metal alloy, and may be retained within the body member by deforming the liner radially outwardly to establish an interference fit with the interior bore of the body member. A sealant may also be placed with the collar between the liner and the body member to seal any space between the two members.

REFERENCES:
patent: 1121386 (1914-12-01), Means
patent: 2656616 (1953-10-01), Hewitt, Jr.
patent: 2958512 (1960-11-01), Hemphrey
patent: 3047313 (1962-07-01), Bruce
patent: 3232638 (1966-02-01), Hollander
patent: 4366971 (1983-01-01), Lula
patent: 4514236 (1985-04-01), Cook et al.
patent: 4688828 (1987-08-01), Shaffer

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