公开(公告)号：US06810955B2

公开(公告)日：2004-11-02

申请号：US10226367

申请日：2002-08-22

申请人： Brian A. Roth ,  Roger D. Hegdahl ,  James H. Kritzler

发明人： Brian A. Roth ,  Roger D. Hegdahl ,  James H. Kritzler

IPC分类号： E21B3406

CPC分类号： E21B23/03 ,  E21B43/123 ,  Y10T29/49881 ,  Y10T137/2934

摘要： A side-pocket gas lift mandrel having tapered end caps threaded onto the ends of the mandrel with metal-to-metal sealing threads. The thickness of each made up thread set is the same as the thickness of the small end of each end cap, resulting in a mandrel having the same outside diameter as if the end caps were welded on, without sacrificing any inside diameter in the small ends of the end caps, compared to a welded mandrel.