Patent ID: 6571868
Filing Date: 2003-06-03
Classification: E21B,F16F

Abstract:
A well head lubricator assembly, comprising:(a) an elongated rigid tubular body having an upper end and a lower end and defining an interior chamber open at said lower end of said tubular body for receiving a leading end of a plunger at a well head, said tubular body having an end structure thereon closing said interior chamber at said upper end of said tubular body; and (b) an elongated body made substantially of a polyurethane material and having a longitudinal axis and characteristics of a coil spring in that said elongated body is capable of resiliently compressing along said longitudinal axis and of springing back to substantially an original form of said elongated body, said elongated body being disposed in said interior chamber of said tubular body between said end structure and said lower end of said tubular body such that upon arrival of the plunger at the tubular body said elongated body will be impacted by the force of the plunger and absorb the impact force.