Apparatus for sealing a tubing string in a high pressure wellbore
This patent describes apparatus for supporting the upper end of a tubing string that extends downhole in a cased borehole while packing off an upper annulus between the tubing and the casing. It comprises a main body having a lower surface by which the body is mounted to the upper end of a casing; a tubing hanger removably received within the main body, one end of the tubing hanger is connected to the upper end of the tubing string for supporting the tubing string therefrom; a tubing support means in the main body; a passageway axially aligned with the vertical passageway and formed through the confronting faces of the piston members for receiving the hollow member in supported relationship therein; a seat on each piston member which is aligned with the piston passageway for receiving the boss of the tubing hanger in seated relationship therein; seal means on the confronting faces of each piston member for sealingly engaging the tubing hanger and one another to prevent flow from a lower to an upper part of the vertical passageway; and, actuator means for reciprocating the piston members from a retracted open position into an extended closed position. The main body has an upper surface, an upper flange removably mounted in supported relationship on the upper surface, seal means on a marginal terminal end of the boss, the marginal terminal end of the boss is sealingly received within the upper flange whereby a stripper assembly can be connected above the flange the interior of the boss can be engaged and lifted upwardly to thereby remove the tubing from the borehole.
- Assignee:
- NOV; NOV-89-083026; EDB-90-006118
- Patent Number(s):
- US 4860826
- Application Number:
- PPN: US 7-149389A
- OSTI ID:
- 5405287
- Resource Relation:
- Patent File Date: 28 Jan 1988
- Country of Publication:
- United States
- Language:
- English
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