Stuffing box and blow out preventing device for polish rods of o

Details Stuffing box and blow out preventing device for polish rods of o Stuffing box and blow out preventing device for polish rods of o

1974-12-23

1976-02-24

Leppink, James A.

Wells

Above ground apparatus

With seal for reciprocating member

251 1B, 277 59, E21B 3303

Patent

active

039399109

ABSTRACT:
A cylindrical tube with a screw threaded packing gland in the upper end carries an upper guide rubber with a plurality of packing rubbers stacked thereabove and engaged by the gland which applies the necessary pressure to seal the polish rod reciprocating within the stuffing box. A blow-out preventor assembly is situated below the upper guide rubber and comprises a cylindrical rubber portion surrounding the polish rod and having O rings sealed adjacent the upper and lower ends of the cylindrical rubber. An annular chamber is formed on the outer surface of the cylindrical rubber between the O rings and communicates with a source of fluid under pressure which can firstly apply pressure to the rubber surrounding the polish rod and shut off the well so that the stuffing box can be serviced and secondly, can act as an automatic blow-out preventor if the polish rod breaks. Further protection is provided by a spring loaded hinged flap valve which is provided at the base of the stuffing box and which snaps shut if the polish rod breaks and disengages from the stuffing box.

REFERENCES:
patent: 816284 (1906-03-01), Williamson
patent: 1922225 (1933-08-01), Wickersham et al.
patent: 2204310 (1940-06-01), Holmquist
patent: 2458270 (1949-01-01), Humason
patent: 2507262 (1950-05-01), McGivern
patent: 2746709 (1956-05-01), Minor
patent: 2843349 (1958-07-01), Meyer
patent: 2945665 (1960-07-01), Regan et al.
patent: 3468374 (1969-09-01), Reeves

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