APPARATUS AND METHOD FOR ADJUSTING SPRING PRELOAD IN A DOWNHOLE TOOL

Title:

APPARATUS AND METHOD FOR ADJUSTING SPRING PRELOAD IN A DOWNHOLE TOOL

Document Type and Number:

WIPO Patent Application WO/2012/068054

Kind Code:

A3

Abstract:

Apparatus and method for adjusting spring preloading in a downhole tool. In one embodiment, a mechanism includes a nut (116) and a piston (112). The nut is configured to axially compress a spring (104) in the downhole tool (100). The piston is coupled to the nut. Extension of the piston causes the nut to rotate and compress the spring. The nut is configured to maintain compression of the spring after the piston retracts.

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Inventors:

SHEEHAN MARK (CA)
PRILL JONATHAN (CA)
CLAUSEN JEFFERY (US)

Application Number:

PCT/US2011/060712

Publication Date:

August 02, 2012

Filing Date:

November 15, 2011

Export Citation:

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Assignee:

NAT OILWELL VARCO LP (US)
SHEEHAN MARK (CA)
PRILL JONATHAN (CA)
CLAUSEN JEFFERY (US)

International Classes:

F16F1/12; E21B31/113

Foreign References:

EP1878869A2	2008-01-16
GB2068437A	1981-08-12
US20060169456A1	2006-08-03
US4323128A	1982-04-06

Attorney, Agent or Firm:

WILSON, David, M. et al. (P.C.PO Box 326, Houston Texas, US)

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