Patent ID: 6746213
Filing Date: 2004-06-08
Classification: E21B,F04B

Abstract:
A pad plunger assembly for use in gas well tubing, comprising:(a) an elongated mandrel having opposite ends and a longitudinal axis extending between said opposite ends; (b) a pair of opposite end members each attached to one of said opposite ends of said mandrel; and (c) at least one seal-forming pad subassembly disposed about said mandrel and between said opposite end members thereon, said pad subassembly having an outer exterior surface of an annular concave configuration formed by opposite end portions of said outer exterior surface being disposed farther radially outwardly from said longitudinal axis of said mandrel than an intermediate portion of said outer exterior surface is disposed radially outwardly from said longitudinal axis of said mandrel such that a frictional seal is provided on the interior wall surface of the gas well tubing by said opposite end portions of said outer exterior surface of said pad subassembly which creates less friction than would be created by an outer exterior surface of cylindrical configuration on said pad subassembly.