Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Reexamination Certificate
2006-05-09
2006-05-09
Thompson, Kenneth (Department: 3672)
Boring or penetrating the earth
With tool shaft detail
Helix or helically arranged structure
C138S122000, C166S242100, C175S320000
Reexamination Certificate
active
07040422
ABSTRACT:
A drill string member is formed by providing a former and a cylindrical member to be shaped in relationship with the former. Seals are provided between opposing ends of a thick wall cylinder and the cylindrical member, a pressure is applied in the annulus between the cylindrical member and the thick wall cylinder sufficient to deform the cylindrical member against the former. The drill string member thus formed has a constant wall thickness and a non-circular former provides a non-circular drill string member.
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SPE 22549 Differential Sticking Laboratory Tests Can Improve MUD Design by M. Bushnell-Waston & S.S. Panesar, 66thAnnual Conference and Exhibition of the Society of Petroleum Engineers, Dallas, Texas, Oct. 6-9, 1991.
SPE 14244 A New Approach to Differential Sticking by J.M. Courteille & C. Zurdo, 60thAnnual Technical Conference and Exhibition of the Society of Petroleum Engineers, Las Vegas, Nevada, Sep. 22-25, 1985.
Keefer Timothy J.
Seyfarth Shaw LLP
Thompson Kenneth
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