Wells – Processes – Assembling well part
Reexamination Certificate
2006-10-17
2006-10-17
Neuder, William (Department: 3672)
Wells
Processes
Assembling well part
C166S241100, C384S024000
Reexamination Certificate
active
07121349
ABSTRACT:
A centralizer is located in a passage of a tubular body of a wellhead assembly for centralizing well tools lowered through the passage. Centralizing members have outer ends mounted to axially extending stationary hinge members, which are mounted to the tubular body in a circular array around a circumference of the passage. A cam and a slot are located between the outer end of each of the centralizing members and the stationary hinge member. Each of the slots has an upward inclined portion, a downward inclined portion, and a neutral position located between the upward and downward inclined portions. A spring urges the cam and the slot to the neutral position, which orients the centralizing members radially inward.
REFERENCES:
patent: 1485308 (1924-02-01), Stegeman
patent: 2365681 (1944-12-01), Gartin
patent: 2365682 (1944-12-01), Curtis et al.
patent: 4326756 (1982-04-01), Moroz et al.
patent: 4505614 (1985-03-01), Anschutz
patent: 6615921 (2003-09-01), Whitelaw et al.
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