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    Magnetic element
    4.
    发明公开
    Magnetic element 失效
    磁性元件

    公开(公告)号：EP0782014A3

    公开(公告)日：1998-08-12

    申请号：EP96120898

    申请日：1996-12-27

    申请人： UNITIKA LTD

    发明人： FURUKAWA SHINJI ,  YANO NOBUYOSHI ,  HIRANO TOSHIYUKI

    IPC分类号： G01V3/00 ,  G01R33/02 ,  G01R33/04 ,  G01V3/40 ,  G01V15/00 ,  H01F10/08 ,  H01F10/12 ,  H01F10/13

    CPC分类号： G01V15/00 ,  G01R33/04

    摘要： A magnetic element comprising an operation portion having a length L which undergoes a steep change in magnetization with a change in external magnetic field and at least one pair of control portions having a coercive force that is higher than that of the operation portion. The control portions are arranged so that a magnetic pole of each of the control portions is generated within a range of not more thin 0.3L from the end of the operation portion, and the control portions are not present within a range of up to 0.2L from the center of the operation portion. The magnetic element of the present invention has a small size and good magnetic characteristics. Furthermore, it has a simple structure that is easily prepared. Moreover, the magnetic characteristics of the magnetic element of the present invention are highly reproducible.

    Procédé de datation d'une couche géologique
    5.
    发明公开
    Procédé de datation d'une couche géologique 失效
    Verfahren zur Datierungen von geologischen Schichten。

    公开(公告)号：EP0581643A1

    公开(公告)日：1994-02-02

    申请号：EP93401877.1

    申请日：1993-07-21

    申请人： COMPAGNIE GENERALE DE GEOPHYSIQUE

    发明人： Martin, Jean-Pierre

    IPC分类号： G01N33/24 ,  G01V3/26 ,  G01V3/40 ,  G01N27/72

    CPC分类号： G01N27/72 ,  G01N33/24 ,  G01V3/26

    摘要： La présente invention concerne les procédés de datation des différents niveaux d'une couche géologique terrestre.
    Le procédé selon l'invention consiste à mesurer l'aimantation rémanente le long d'un puits foré dans la couche géologique, à détecter l'ensemble des inversions de l'aimantation rémanente, à mesurer l'aimantation induite aux différents niveaux de cette couche, à détecter les maxima d'aimantation induite et à établir une corrélation entre ces différentes mesures et les dates connues, d'une part des inversions du champ magnétique terrestre et d'autre part de phénomènes terrestres ayant entraîné des concentrations de produits fortement magnétiques, pour attribuer une date aux différents niveaux de la couche.
    Application, notamment, à la recherche pétrolière.

    摘要翻译： 本发明涉及用于测定陆地地质层的各种水平的方法。 根据本发明的方法在于测量在地质层中钻出的钻井中的剩磁（剩余磁化），在检测所有的剩磁反转时，测量在该层的各个层次上引起的磁化，以检测诱导的最大值 磁化和建立这些各种测量和已知日期之间的相关性，一方面是地球磁场的反转，另一方面，导致高磁性产品浓度的陆地现象，以便 为该层的各个级别分配一个日期。 尤其适用于石油勘探。

    REAL-TIME, LIMITED ORIENTATION SENSOR AUTO-CALIBRATION
    9.
    发明公开
    REAL-TIME, LIMITED ORIENTATION SENSOR AUTO-CALIBRATION 审中-公开

    公开(公告)号：EP3143246A4

    公开(公告)日：2018-02-28

    申请号：EP15792309

    申请日：2015-05-15

    申请人： BAKER HUGHES INC

    发明人： ESTES ROBERT A ,  RIGGS RANDY R ,  HANAK FRANCIS CHAD ,  PRIEST JOHN F

    IPC分类号： E21B47/00 ,  E21B47/09 ,  G01V3/18 ,  G01V3/26 ,  G01V3/40 ,  G01V7/00 ,  G01V7/04 ,  G01V11/00 ,  G01V13/00

    CPC分类号： G01V3/26 ,  E21B47/0905 ,  G01V3/40 ,  G01V7/00 ,  G01V7/005 ,  G01V7/04 ,  G01V11/00 ,  G01V13/00

    摘要： A system method and computer-readable medium for correcting measurements obtained by a down hole tool for residual measurement errors is disclosed. A down hole tool having at least two directional field sensors is disposed in a borehole. The at least two directional sensors are substantially orthogonal to each other and to a longitudinal axis of the down hole tool. Measurements are obtained from the at least two directional sensors during rotation of the tool by at least 360 degrees around the longitudinal axis of the tool. Residual measurement errors are determined for the obtained measurements, and a quality level of the determined residual measurement errors selected. The determined residual measurement errors are applied to the obtained measurements when the determined residual measurement errors are consistent with the selected quality level. In various embodiments, the residual measurement errors are reduced from a first value that does not match the selected quality level to a second value that are consistent with the selected quality level.

    DETERMINING LOCAL VARIATIONS OF EARTH'S MAGNETIC FIELD
    10.
    发明公开
    DETERMINING LOCAL VARIATIONS OF EARTH'S MAGNETIC FIELD 有权
    BESTIMMUNG LOKALER VARIATIONEN EINES ERDMAGNETFELDES

    公开(公告)号：EP2895888A4

    公开(公告)日：2016-06-15

    申请号：EP13838020

    申请日：2013-09-10

    申请人： SCIENT DRILLING INT

    发明人： HOVE JIM

    IPC分类号： G01V3/00 ,  G01V3/08 ,  G01V3/40

    CPC分类号： G01V11/00 ,  E21B7/04 ,  E21B47/022 ,  G01V3/081

    摘要： A method to determine the earth's magnetic field vector along a sub-surface wellpath having unknown and possibly changing azimuth, in the presence of a magnetic disturbance caused by a magnetic source external to the wellpath includes estimating the three components of the earth field along the three axes of a magnetic sensor package by a polynomial function of measured depth along the wellpath. Upon removal of the earth's magnetic field from the measurements, the resultant magnetic field of the disturbance is determined and can be used to determine the position and orientation of the source of the disturbance.

    摘要翻译： 在存在由井道外部的磁源引起的磁场干扰的情况下，沿着具有未知且可能改变的方位角的子表面路径确定地球磁场矢量的方法包括估计沿着三维的地球场的三个分量 通过沿着井径测量的深度的多项式函数的磁传感器封装的轴。 当从测量中去除地球的磁场时，确定干扰的合成磁场并且可以用于确定干扰源的位置和取向。