Title:
FLAPPER OPENING MECHANISM
Document Type and Number:
WIPO Patent Application WO2005100740
Kind Code:
A3
Abstract:
A valve assembly comprises a flapper element and a valve opening assembly that will mechanically open the flapper element. The valve opening assembly is particularly valuable where the flapper element fails to open in response to normal hydraulic opening techniques. The valve opening assembly includes a valve opening sleeve having a generally hemispherical cross-section and an opening portion that presents a pair of opening shoulders. The opening shoulders engage lugs on the flapper element so that movement of the opening sleeve will urge the flapper element to an open position. The valve assembly may be run into the wellbore with the flapper element in the open position, rather than having to be closed, as with a number of conventional valve assemblies.
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Inventors:
DRUMMOND STEVEN J
FARQUHAR GRAHAM
FARQUHAR GRAHAM
Application Number:
PCT/US2005/011634
Publication Date:
December 22, 2005
Filing Date:
April 07, 2005
Export Citation:
Assignee:
BAKER HUGHES INC (US)
International Classes:
E21B23/00; E21B34/06; G09F3/20; G09F23/00; E21B34/00; (IPC1-7): E21B34/06; E21B23/00
Domestic Patent References:
| WO2001036787A1 | 2001-05-25 | |||
| WO2003080993A1 | 2003-10-02 |
Foreign References:
| US5323859A | 1994-06-28 | |||
| US4122898A | 1978-10-31 | |||
| US20010007284A1 | 2001-07-12 | |||
| US20010022194A1 | 2001-09-20 | |||
| US6263910B1 | 2001-07-24 |
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