Well head shut-off device
A well head shut-off device, comprising: (a) a housing adapted to be connected to the upper end of production tubing and having a vertical bore therethrough, a flow conduit communicating with the interior of the bore for collection of liquid flowing into the bore from the production tubing, and a shoulder extending laterally inwardly of the bore at upper and lower portions thereof; (b) a pack-off member disposed in the bore and comprising a heat resistant resiliently deformable annular sealing element of which the middle opening extends vertically of the bore and is adapted to receive a cylindrical shaft therethrough, and the periphery conforms to the interior of the bore, a rigid face plate on the upper and lower sides of the sealing element, and a rigid expansion member tapering from adjacent one of the face plates vertically toward the interior of the sealing element and being received in a corresponding cavity therein; (c) an operator member slidable vertically relative to the pack-off member and face plates and having upper and lower abutments facing toward the face plates on the upper and lower side of the sealing element, respectively; and (d) means for reciprocating the operator member between an upper position engaging the upper face plate on the upper shoulder and compressing the sealing element between the upper face plate and the lower face plate retained on the lower abutment, and a lower position engaging the lower face plate on the lower shoulder and compressing the sealing element between the lower face plate and the upper face plate retained on the upper abutment, whereby in each of the positions the sealing elements is compressed vertically and the expansion member is driven vertically into the cavity, thereby expanding the sealing element laterally to form a seal between the bore and the cylindrical shaft when inserted therein.
- Assignee:
- Positive Action Tool Western Ltd., Calgary
- Patent Number(s):
- US 4655284
- OSTI ID:
- 6825214
- Resource Relation:
- Patent File Date: Filed date 11 Feb 1986
- Country of Publication:
- United States
- Language:
- English
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