E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/47
E21B 33/03 (2006.01) E21B 33/08 (2006.01) E21B 34/02 (2006.01)
Patent
CA 1300003
ABSTRACT OF THE DISCLOSURE A wellhead stuffing box for sealing around the polished rod from a pumping unit to a reciprocating well pump to provide emergency closure of the bore through the wellhead in the event of breakage of the polished rod. The valve assembly includes a flapper valve mounted on a swivel pin for movement between a vertical open position and a horizontal closed position across the wellhead bore. The flapper valve is spring biased toward the open position. A well pressure responsive cylinder and piston assembly is on the side of the wellhead with an operating rod through the wellhead against the flapper valve to move the valve from the open position to a horizontal closed position. The piston is exposed to well pressure on the one side urging the piston outwardly to the valve open position and a spring engages the piston on the opposite side biasing the piston inwardly toward the valve closed position when well pressure is not sufficient to keep the spring compressed. One form of the wellhead includes a packing assembly for sealing around the polished rod. A second embodiment includes only the valve assembly which is used with a standard packing assembly. A third embodiment of the wellhead includes a swivel mounted packing assembly to permit the polished rod to deviate from the vertical.
572848
Double-E Inc.
Heinonen Robert L.
Riches Mckenzie & Herbert Llp
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