发明授权
EP2752551B1 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

Enhanced device for determining the location of induced stress in stuck borehole tubulars
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.
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