Casing weight set seal ring
This patent describes improvement in an apparatus for supporting and sealing a string of casing in a well of a type having at the upper end of the well a tubular housing with a bore and a housing landing shoulder therein. The improvement comprises: a metal seal sleeve having a downward facing external shoulder adapted to be landed on the housing landing shoulder, the seal sleeve having an external sealing surface and a bore with an internal sealing surface and an upward facing internal shoulder; a tubular suspension mandrel having an external wedging section which slidingly engages the internal sealing surface of the bore of the sleeve, the suspension mandrel moving downward into the seal sleeve when the seal sleeve lands on the landing shoulder in the housing and having an external downward facing shoulder which lands on the internal shoulder of the seal sleeve; means on a lower end of the suspension mandrel for securing the suspension mandrel to the string of casing; and the wall thickness of the sleeve being dimensioned such that the weight of the string of casing will cause the suspension mandrel to wedge the sealing surface of the seal sleeve radially outward into sealing engagement with the bore of the housing as the suspension mandrel lands in the seal sleeve, with the wedging section of the mandrel sealing against the internal sealing surface of the seal sleeve.
- Assignee:
- ABB Vetco Gray Inc., Houston, TX (United States)
- Patent Number(s):
- A; US 5094297
- Application Number:
- PPN: US 7-605733
- OSTI ID:
- 5356499
- Country of Publication:
- United States
- Language:
- English
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