Stuffing box
AssigneeBrightling Equipment Ltd.
InventorDerek Tebay
Life of this patent
Estimating the term…
Abstract
A stuffing box for a wellhead, the stuffing box comprising: a stationary housing defining a passage for receiving a well tubular; a tubular shaft mounted on the stationary housing for rotation within the passage and defining an inner axial bore adapted to form a static seal around a well tubular in use; and a dynamic pressure seal mounted within an annular cavity defined by respective cylindrical surfaces of the stationary housing and tubular shaft, in which one or both of the respective cylindrical surfaces are tapered to decrease the radial cross sectional area of a seal travel portion of the annular cavity in an axial direction downstream from a well end of the stuffing box.
Claims15
A stuffing box for a wellhead, the stuffing box comprising:
- a stationary housing defining a passage for receiving a well tubular;
- a tubular shaft mounted on the stationary housing for rotation within the passage and defining an inner axial bore adapted to form a static seal around a well tubular in use;
- and
- a dynamic pressure seal mounted within an annular cavity defined by respective cylindrical surfaces of the stationary housing and tubular shaft, in which one or both of the respective cylindrical surfaces are tapered to decrease the radial cross sectional area of a seal travel portion of the annular cavity in an axial direction downstream from a well end of the stuffing box.
Dependencies are inferred from the claim text.