Plunger apparatus

专利名称：Plunger apparatus发明人：Benjamin F. Spingath, Jr.申请号：US06/709314申请日：19850307公开号：US04621987A公开日：19861111

摘要：A plunger apparatus for pumping fluid in a well having a tubular barrel, theapparatus providing an upper portion adapted to be secured on a tubing string for axialmovement within the barrel, the upper portion providing a bore axially therethrough andmounting a filter element in communication with a plurality of passages communicatingtransversely through the upper portion from the bore to an interface defined betweenthe exterior surface of the upper portion and the well barrel; an elongated, sleeve-likeintermediate portion secured on the upper portion and providing a bore axially

therethrough; and a lower portion secured on the intermediate portion and providing abore axially therethrough and mounting a valve member internally of the bore; and aplurality of sealing members circumscribing the upper portion and lower portion andbounding the interface defined between the apparatus and the well barrel.

申请人：SWAIM; WILLIAM

代理机构：Worrel & Worrel

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