Systems and methods for reducing backward whirling while...

Details Systems and methods for reducing backward whirling while... Systems and methods for reducing backward whirling while...

2011-06-21

2011-06-21

Beach, Thomas A (Department: 3674)

Boring or penetrating the earth

Means traveling with tool to constrain tool to bore along...

Normally curved guide or shaft

Reexamination Certificate

active

07963347

ABSTRACT:
According to the invention, a system for drilling a cavity in a medium is disclosed. The system may include a bottom hole assembly. The bottom hole assembly may include a first longitudinal segment and at least one drill bit. The first longitudinal segment may include a first length of chassis having a first cross section. The first cross section may be configured such that the first longitudinal segment may have a greater stiffness in a first lateral direction than in a lateral direction different than the first lateral direction.

REFERENCES:
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patent: 5560439 (1996-10-01), Delwiche et al.
patent: 5864058 (1999-01-01), Chen
patent: 6205851 (2001-03-01), Jogi
patent: 2005/0071120 (2005-03-01), Hutchinson
patent: 2403236 (2004-12-01), None
patent: 9923346 (1999-05-01), None
Jardine et al., Putting a Damper on Drilling's Bad Vibrations, Oilfield Review, Jan. 1994, pp. 15-20.
Patent Cooperation Treaty, International Search Report, dated Apr. 22, 2009, 4 pages.

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