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    Enhanced device for determining the location of induced stress in stuck borehole tubulars
    26.
    发明授权
    Enhanced device for determining the location of induced stress in stuck borehole tubulars 有权
    用于确定卡钻井管中诱发应力的位置的增强装置

    公开(公告)号：EP2752551B1

    公开(公告)日：2018-02-28

    申请号：EP13197618.5

    申请日：2013-12-17

    申请人： Ge Oil & Gas Esp, Inc.

    发明人： Mason, Guy Harvey

    IPC分类号： E21B23/00 ,  E21B47/09

    CPC分类号： G01L1/12 ,  E21B23/00 ,  E21B47/09 ,  E21B47/0905

    摘要： A method for identifying the location of a binding zone between a stuck tubular and a borehole includes the steps of passing a demagnetizing stress sensor 106 through the tubular on a baseline magnetization pass to magnetize the tubular. Next, the demagnetizing stress sensor 106 measures a baseline magnetization of the tubular. Once the baseline magnetization has been established, the method continues by applying a stress to the tubular and passing the demagnetizing stress sensor 106 through the tubular on a scanning pass while the tubular is stressed. The demagnetizing stress sensor 106 then measures a stress-induced magnetization of the tubular. The method concludes by comparing the baseline magnetization of the tubular against the stress-induced magnetization of the tubular. Notably, in preferred embodiments, the method includes the magnetization of the tubular in a substantially radial direction and the stresses are applied in vectors perpendicular to the radial magnetization of the tubular.

    DOWNHOLE TOOL FOR MEASURING ACCELERATIONS
    27.
    发明公开
    DOWNHOLE TOOL FOR MEASURING ACCELERATIONS 审中-公开
    用于测量加速度的井下工具

    公开(公告)号：EP3262277A1

    公开(公告)日：2018-01-03

    申请号：EP16756135.6

    申请日：2016-02-22

    申请人： Services Pétroliers Schlumberger ,  Schlumberger Technology B.V.

    发明人： JEFFRYES, Benjamin Peter

    IPC分类号： E21B47/00 ,  E21B47/09 ,  G01V9/00

    CPC分类号： E21B47/022 ,  E21B47/024

    摘要： A downhole tool is provided for measuring accelerations at a location within a subterranean borehole. The tool is rotatable around the longitudinal direction of the borehole. The tool includes four accelerometers, each accelerometer measuring acceleration in a respective direction and being arranged such that at least a component of its measured acceleration is normal to the longitudinal direction. The accelerometers are further arranged such that no more than any two of the four accelerometers have their respective components parallel to the same direction. The tool also includes a first device which measures the rotational speed of the tool. The tool also includes a processor unit which relates the acceleration measured by each accelerometer to the true acceleration at that accelerometer by a respective scaling term and a respective offset, and combines the measured accelerations and the tool rotational speed to re-calibrate the scaling terms as the tool rotates.