Dual flapper valve assembly

Details Dual flapper valve assembly Dual flapper valve assembly

1988-07-21

1989-07-11

Kisliuk, Bruce M.

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

166 51, 166317, 166323, 166386, 137613, 13761402, E21B 3414, E21B 4304

Patent

active

048462810

ABSTRACT:
A dual flapper valve assembly permits a well logging operation to be carried out after a gravel pack has been deposited without losing a large amount of completion fluid into the formation. The dual flapper valves can be closed and fractured independently of each other and selectively to accommodate a gravel pack operation, a well logging operation and a completion fluid recovery operation. The closure plate of the lower flapper valve is propped open by the wash pipe during the gravel pack operation. The lower closure plate is fractured to accommodate a well logging operation, while the closure plate of the upper flapper valve is held open by a prop sleeve. Upon completion of the well logging operation, the prop sleeve is retracted out of engagement with the closure plate of the upper flapper valve, thereby permitting the upper flapper valve to close. The heavy completion fluid remaining in the casing annulus is thereby conserved and can be recovered to the surface, while the gravel pack and the formation are protected from the pressure of the heavy completion fluid. After recovery of the completion fluid, the closure plate of the upper flapper valve is fractured to accommodate production operations.

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patent: 4605070 (1986-08-01), Morris
patent: 4691775 (1987-09-01), Lustig et al.

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