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    MULTIPLE STAGE MECHANICAL DRIFT TOOL
    1.
    发明公开
    MULTIPLE STAGE MECHANICAL DRIFT TOOL 有权
    多级机械DRIFT工具

    公开(公告)号：EP2419603A2

    公开(公告)日：2012-02-22

    申请号：EP10718466.5

    申请日：2010-04-14

    申请人： Services Pétroliers Schlumberger ,  Schlumberger Technology B.V. ,  Schlumberger Holdings Limited ,  PRAD Research and Development Limited

    发明人： GILLAN, Peter

    IPC分类号： E21B47/08 ,  G01B5/12

    CPC分类号： E21B47/08 ,  G01B5/12 ,  Y10T29/49826

    摘要： A downhole tool for measuring a diameter within a borehole includes a mandrel having a first end and a second end with an axis defined therethrough, A tapered surface is formed on an outside surface of the mandrel such that a first end of the tapered surface has a larger diameter than a second end of the tapered surface. The downhole tool further includes a collet disposed about the mandrel such that the collet is configured to move along the axis of the mandrel with respect to the mandrel in a direction from the first end of the mandrel to the second end of the mandrel. A method of measuring a diameter within, a borehole, using a downhole tool including a mandrel having a first end, a second end, and an axis defined therethrough; and a collet disposed about the mandrel, the method includes: disposing the downhole tool into the borehole such that the first end of the mandrel enters the borehole before the second end of the mandrel; and applying a force to the second end of the downhole tool, upon the downhole tool contacting an obstruction in the borehole. Based on the force applied to the downhole tool, the collet moves along the axis of the mandrel with respect to the mandrel such that an outer diameter of the downhole tool decreases. A method of manufacturing a downhole tool for measuring a diameter within a borehole includes providing a mandrel having a first end and a second end with an axis defined therethrough, forming a tapered surface on an outside surface of the mandrel such that a first end of the tapered surface has a larger diameter than a second end of the tapered surface; and disposing a collet about the mandrel such that the collet is configured to move along the axis of the mandrel with respect to the mandrel in a direction from the first end of the mandrel to the second end of the mandrel.