发明名称 Tool for lowering into centered position within a well bore
摘要 There is disclosed a tool which is adapted to be lowered and raised through a well conduit into and out of a centered position within a well bore beneath the lower end of the conduit. The tool has arms which are spring pressed toward outer positions for engaging the well bore, but held in inner positions in which they may move vertically through the well conduit until the tool has been lowered into a bore near the lower end of the well conduit, and then returned to and reheld in such position upon raising of the tool above the bore during retrieval of the tool.
申请公布号 US4776397(A) 申请公布日期 1988.10.11
申请号 US19860915380 申请日期 1986.10.06
申请人 AVA INTERNATIONAL CORPORATION 发明人 AKKERMAN, NEIL H.
分类号 E21B17/10;(IPC1-7):E21B17/10 主分类号 E21B17/10
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