Wells – Packers or plugs – With expanding anchor
Patent
1994-04-26
1995-06-20
Neuder, William P.
Wells
Packers or plugs
With expanding anchor
166134, 166189, E21B 2300
Patent
active
054254183
ABSTRACT:
The invention relates to a multi-bore packer that has an annularly shaped sealing element. The assembly has a series of strings that run continuously so that they can be supported from the surface. At least one hub segment straddles the strings and is sealed in between. The entire assembly features one of the hubs with a sealing element. The outer sealing element, when compressed, seals against a casing or wellbore as well as against one of the hubs through which the strings extend. A greater effective piston area allows setting with surface pressures below 2500 psig. A provision is made in the assembly of hubs to provide for an operating mechanism to compress the outer seal between the casing and the hub, by increasing the applied sealing forces on the outer seal, should well conditions apply greater differential pressures, in either direction, to the outer seal than the original setting pressure used. A longitudinal lock is provided between a movable piston segment and one of the hubs to avoid actuation of the outer seal against the casing until a predetermined force is applied. During make-up, a secondary lock can be applied to the locking mechanism for pressure-testing purposes of the strings which run through the hubs. Finally, the lock mechanism features a design which retains a movable piston stationary after its actuation for release of the lock. Back-and-forth movement is prevented which may have a detrimental effect on the seals surrounding the movable piston in the lock assembly. Therefore, after the tool is set when the lock is unlocked, the piston component of the lock remains in a substantially fixed position, despite pressure fluctuations in the wellbore which would have otherwise urged the piston to move in opposed directions.
REFERENCES:
patent: 3252516 (1966-05-01), Leutwyler
patent: 4248307 (1981-02-01), Silberman et al.
patent: 5129454 (1992-07-01), Telfer
Arizmendi Napoleon
Lembcke Jeffrey J.
Baker Hughes Incorporated
Neuder William P.
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