Self-contained centralizer system

Details Self-contained centralizer system Self-contained centralizer system

2006-09-12

2006-09-12

Tsay, Frank S. (Department: 3672)

Wells

Guide for device or conduit

C166S241400

Reexamination Certificate

active

07104318

ABSTRACT:
A centralizer assembly for centralizing casing inside a riser includes a locking element to move generally radially outward from the casing toward the riser in response to a change in pressure in the annulus between the casing and the riser. The locking element may be a first wedge shaped element adapted for movement in a radial direction from the casing toward the riser and a second wedge shaped element adapted to move generally axially along the casing and adapted for engaging the first wedge shaped element in response to a pressure activated driver. The driver may be a rupture device that ruptures when the pressure in the annulus reaches a predetermined threshold. Ratchet teeth are included between the elements for engaging and locking the wedge shaped elements in position once driven by the driver.

REFERENCES:
patent: 5655609 (1997-08-01), Brown et al.
patent: 6343657 (2002-02-01), Baugh et al.
patent: 6561280 (2003-05-01), Baugh et al.
patent: 6629568 (2003-10-01), Post et al.

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