Rotary fluid-sealing structure using speed-reduction stages

Details Rotary fluid-sealing structure using speed-reduction stages Rotary fluid-sealing structure using speed-reduction stages

2007-01-04

2008-12-16

Bagnell, David J (Department: 3672)

Wells

Above ground apparatus

With seal for reciprocating member

C175S195000, C475S337000

Reexamination Certificate

active

07464750

ABSTRACT:
The present invention provides for a rotary fluid-sealing structure for a harsh environment which reduces the PV pressure (×velocity) that a sealing system may be exposed through the use of a rotary speed reducing planetary gear system. The system may have multiple stages with the amount of velocity reduction produced by the system being determined by the number of stages and the planetary gear ratios. Several alternatives are presented for the sealing under extreme conditions such as found in the interface between a wash-pipe and a rotary drilling string in a drilling rig.

REFERENCES:
patent: 3901330 (1975-08-01), Slator et al.
patent: 7231969 (2007-06-01), Folk et al.
patent: 2002/0121367 (2002-09-01), Meek et al.
patent: 2003/0205864 (2003-11-01), Dietle et al.
patent: 2006/0035746 (2006-02-01), Griggs et al.

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