专利名称：Pad type plunger发明人：Edward A. Wells申请号：US11434740申请日：20060516
公开号：US20070267189A1公开日：20071122
专利附图：
摘要：A plunger lift for a hydrocarbon well includes a piston that is dropped into thewell and then moved upwardly to lift liquid to the surface from adjacent a hydrocarbonformation. The piston includes a series of pads biased outwardly into engagement withan inside wall of the production string thereby providing an improved seal between the
piston and the production string. The pads are biased outwardly by pressure from belowor a pressure differential that is moving the piston upwardly. The force moving the padsoutwardly are greater during upward movement of the piston than during downwardmovement. The piston includes a central one-piece mandrel having an upper end higherthan any component of the piston and a lower end lower than any component of thepiston so that impact forces are applied directly to the mandrel and not through athreaded component.
申请人：Edward A. Wells
地址：Corpus Christi TX US
国籍：US
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