Sub drilling sub

Details Sub drilling sub Sub drilling sub

2004-03-04

2008-08-19

Gay, Jennifer H (Department: 3676)

Boring or penetrating the earth

With tool shaft detail

Axially telescoping shaft section

C166S242700

Reexamination Certificate

active

07413036

ABSTRACT:
A telescoping sub (50) for mining operations and the like. The telescoping sub (50) includes a rotor (94) portion coupleadle to the rotary head of a drilling rig, and a stator (74) portion that is coupleable to a drill rod. The rotor (94) portion is slideadly coupled to the stator (74) portion and is moveable with respect thereto between an extended position and a retracted position. With the telescoping sub (50) in the retracted position, the drilling rig is operated to drill to a first depth. The drilling rig is then operated to move the rotor (94) portion to the extended position, and the drilling rig is operated to drill to a second depth that is greater than the first depth.

REFERENCES:
patent: 3194330 (1965-07-01), Ware et al.
patent: 3447652 (1969-06-01), Tipton
patent: 3763666 (1973-10-01), Tibussek
patent: 4196781 (1980-04-01), Cheek
patent: 5168944 (1992-12-01), Andersson
patent: 6332841 (2001-12-01), Secord
patent: 0 376 239 (1990-07-01), None
patent: 376239 (1990-07-01), None
Model 306430 Floating Cushion Sub, Formost Industries Inc., 2 pages, available before Jan. 23, 2003.
Thruster Systems Improved Performance-Reduced Vibrations, Baker Hughes Incorporated, 603-019, 4 pages, Jul. 1999.

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