Polished rod stuffing box with safety valve for a beam pumped production well
Patent
·
OSTI ID:7181132
This patent describes a wellhead assembly for a beam pump assembly of a beam pumped production well. It comprises: a stuffing box for providing a seal around a polished rod of the beam pump assembly. The stuffing box comprising first, second and third tubular elements, which elements are co-axially arranged around the polished rod. The first element being mounted on top of a ball coupling. The second element at least partly surrounding and being screwed on top of the first tubular element. The third element at least partly surrounding and being screwed on top of the second element and the third tubular element carries a safety valve. The safety valve comprising a flapper type valve body which is hingeably secured to the stuffing box in such a manner that in use a wear plate carried by the valve body is pressed against the polished rod; means for monitoring the amount of wear of the wear plate on the basis of the angular orientation of the valve body relative to the stuffing box; and back-up seal rings between the first and second tubular elements and between the second and third tubular elements defining an annular space in which the back-up seal rings are arranged.
- Assignee:
- Shell Internationale Research, The Hague
- Patent Number(s):
- A; US 4889184
- Application Number:
- PPN: US 7-194607A
- OSTI ID:
- 7181132
- Country of Publication:
- United States
- Language:
- English
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