Polished rod stuffing box with safety valve for a beam pumped production well
First Claim
1. A wellhead assembly for a beam pump assembly of a beam pumped production well, the assembly comprisinga stuffing box for providing a seal around a polished rod of the beam pump assembly, said stuffing box comprising first, second and third tubular elements, which elements are co-axially arranged around the polished rod, said first element being mounted on top of a ball coupling, said second element at least partly surrounding and being screwed on top of said first tubular element and said third element at least partly surrounding and being screwed on top of said second element and said third tubular element carries a safety valve;
- said 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 said first and second tubular elements and between said second and third tubular elements defining an annular space in which said back-up seal rings are arranged.
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Accused Products
Abstract
A wellhead assembly for a beam pumped production well comprises a stuffing box for providing a seal around a polished rod of the beam pump assembly and a flapper type safety valve for sealing off the wellhead in case of polished rod failure. The safety valve comprises a wear plate which is pressed against the polished rod and means are provided for monitoring the amount of wear of the wear plate on the basis of the angular orientation of the safety valve relative to the stuffing box.
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Citations
7 Claims
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1. A wellhead assembly for a beam pump assembly of a beam pumped production well, the assembly comprising
a stuffing box for providing a seal around a polished rod of the beam pump assembly, said stuffing box comprising first, second and third tubular elements, which elements are co-axially arranged around the polished rod, said first element being mounted on top of a ball coupling, said second element at least partly surrounding and being screwed on top of said first tubular element and said third element at least partly surrounding and being screwed on top of said second element and said third tubular element carries a safety valve; -
said 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 said first and second tubular elements and between said second and third tubular elements defining an annular space in which said back-up seal rings are arranged. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification