Washpipe apparatus

Details Washpipe apparatus Washpipe apparatus

2005-08-02

2005-08-02

Neuder, William (Department: 3672)

Wells

Above ground apparatus

Inner member anchor or seal with lateral port

C166S090100

Reexamination Certificate

active

06923254

ABSTRACT:
Methods and apparatus for providing enhanced seal life of a swivel seal assembly by decreasing the effective differential pressure across a given rotating seal. The differential pressure is decreased by providing a pressurized fluid on the low-pressure side of the seal at a predetermined fraction of the operating pressure of the swivel seal assembly. A preferred swivel seal assembly utilizes a washpipe and packing box that are rigidly affixed to their respective conduits such that misalignment and dynamic run-out is compensated for in the gap between the washpipe and the packing box. A control system monitors and regulates the pressurized fluid supplied to the assembly.

REFERENCES:
patent: 2394800 (1946-02-01), Murphy
patent: 2459472 (1949-01-01), Tremolada
patent: 2608385 (1952-08-01), Stahl
patent: 3752507 (1973-08-01), Maurer et al.
patent: 4557489 (1985-12-01), Wentworth
patent: 4807890 (1989-02-01), Gorman et al.
patent: 6007105 (1999-12-01), Dietle et al.
patent: 2004/0035574 (2004-02-01), Pippert
patent: 694 230 (1953-07-01), None
European Search Report for Application No. EP 04 25 2151 dated Jul. 15, 2004 (2 p.).

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