Surface controlled subsurface safety valve
Patent
·
OSTI ID:6593818
This patent describes a safety for downhole use in a well. It comprises: housing means having a longitudinal bore extending there-through; valve closure means mounted in the housing means to control fluid flow through the longitudinal bore; the valve closure means having a first position which allows fluid flow through the longitudinal bore and a second position which blocks fluid flow therethrough; an operator tube in the housing means to shift the valve closure means from its second position to its first position; piston means for moving the operator tube in response to control fluid pressure from the well surface; the piston means disposed within the housing means offset from the longitudinal bore; a bearing assembly carried on the exterior of the operator tube with ball bearings disposed between an upper bearing race and a lower bearing race and its outside diameter compatible with the interior of the housing means and slidably disposed around the exterior of the operator tube; and the piston means engaging the bearing assembly to transmit force to the operator tube.
- Assignee:
- Otis Engineering Corp., Dallas, TX (USA)
- Patent Number(s):
- A; US 4945993
- Application Number:
- PPN: US s 7-354373
- OSTI ID:
- 6593818
- Country of Publication:
- United States
- Language:
- English
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