Seal for a drill string

Details Seal for a drill string Seal for a drill string

2008-04-04

2011-11-29

Stephenson, Daniel P (Department: 3676)

Wells

Above ground apparatus

With seal for reciprocating member

Reexamination Certificate

active

08066062

ABSTRACT:
Sealing arrangement for dynamic sealing around a drill stem (16) or a coiled tubing is described, comprising an elongated, dynamic sealing unit (10) which is arranged to surround the drill stem (16), in that the sealing unit (10) comprises a number of sets with main seals (20) arranged mutually spaced apart in the longitudinal direction of the sealing unit (10), where said main seals (20) comprise at least one disc-formed or ring-formed packer element (30) of an elastic material, such as an elastomeric material, arranged to surround said drill stem (16). Said main seal (20) comprises at least one inlet channel arranged to receive a friction reducing medium through or via the seal directly into the seal surface (32) of the packer element (30), against the drill stem (16).

REFERENCES:
patent: 1875632 (1932-09-01), McEvoy
patent: 2222082 (1940-11-01), Leman et al.
patent: 3387851 (1968-06-01), Cugini
patent: 3965987 (1976-06-01), Biffle
patent: 6325159 (2001-12-01), Peterman et al.
patent: 7258171 (2007-08-01), Bourgoyne et al.
patent: 7779903 (2010-08-01), Bailey et al.
patent: 2005/0061499 (2005-03-01), Hopper
patent: 2006/0037782 (2006-02-01), Martin-Marshall
patent: 2010/0147525 (2010-06-01), Lerner et al.
patent: 2010/0175882 (2010-07-01), Bailey et al.

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