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9 条记录 (耗时 0.012 秒)

    Apparatus for drilling a small borehole downwardly from the bottom of a large borehole
    7.
    发明授权
    Apparatus for drilling a small borehole downwardly from the bottom of a large borehole 失效
    从大型井底下方钻出一个小洞的装置

    公开(公告)号：US3635295A

    公开(公告)日：1972-01-18

    申请号：US3635295D

    申请日：1969-12-02

    申请人： FENIX & SCISSON INC

    发明人： COBBS JAMES H

    IPC分类号： E21B10/64 ,  E21B17/07 ,  E21B25/04 ,  E21B11/00

    CPC分类号： E21B25/04 ,  E21B10/64 ,  E21B17/07

    摘要： A small borehole drilling tool, lowered into a large borehole tubular drilling bit, includes a drill shaft interconnected to the large borehole drilling bit through driving drums for common rotation therewith. The small borehole drilling tool further includes upwardly of the drill shaft a coaxial neck, and an annular seal interposed between the neck and the inner wall of the large borehole drilling bit to form a drilling fluid chamber which receives and retains drilling fluid which in turn produces a downward thrust force on the upper surface of the annular seal to force the small borehole drill shaft downwardly into the earth during rotation thereof.

    摘要翻译： 一个下钻入大型井眼管状钻头的小型钻孔钻具包括一个通过驱动滚筒与大钻孔钻头相互连接的钻杆轴，以与其共同旋转。 小钻孔钻具还包括钻杆轴向上的同轴颈部，以及插入在大钻孔钻头的颈部和内壁之间的环形密封件，以形成接收和保留钻井液的钻井液室，钻井液室又产生 环形密封件的上表面上的向下的推力，用于在其旋转期间将小钻孔钻杆轴向下推入地球。

    Method and apparatus for measuring in situ the earth stress at a preselected subterranean area
    8.
    发明授权
    Method and apparatus for measuring in situ the earth stress at a preselected subterranean area 失效
    在预测的地下地区测量地球应力的方法和装置

    公开(公告)号：US3557886A

    公开(公告)日：1971-01-26

    申请号：US3557886D

    申请日：1969-06-30

    申请人： FENIX & SCISSON INC

    发明人： COBBS JAMES H

    IPC分类号： E21B49/00 ,  E21F17/18 ,  G01B7/16 ,  E21B47/12 ,  G01B5/30

    CPC分类号： E21B49/006 ,  E21F17/185 ,  G01B7/18

    摘要： This invention relates to a method and apparatus for measuring in situ the earth stress at a preselected subterranean area. More particularly, the invention relates to a method and apparatus of measuring the earth stress at a preselected subterranean area including drilling a large diameter borehole in the earth''s surface to a point immediately above the preselected area, drilling a small diameter borehole from the bottom of the large diameter borehole into the preselected area, positioning into the small borehole an expandable sleeve having a plurality of strain rosettes thereon, injecting cement exteriorly of the expandable sleeve, applying hydraulic pressure to the interior of the expandable sleeve to expand the same against the wall of the small diameter hole whereby the strain rosettes are cemented to the earth''s structure forming the circumference of the small diameter borehole, and drilling the large diameter borehole into the preselected area with a tubular drill which axially receives the expandable sleeve and the portion of the earth''s structure immediately adjacent thereto, the distortion of the structure forming the wall of the small diameter borehole being reflected by the strain rosettes as the large diameter borehole is drilled.