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    DETERMINING LOCAL VARIATIONS OF EARTH'S MAGNETIC FIELD
    24.
    发明公开
    DETERMINING LOCAL VARIATIONS OF EARTH'S MAGNETIC FIELD 有权
    确定的地磁场局部变化

    公开(公告)号：EP2895888A1

    公开(公告)日：2015-07-22

    申请号：EP13838020.9

    申请日：2013-09-10

    申请人： Scientific Drilling International, Inc.

    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.

    MAGNETIC SENSING APPARATUS, SYSTEMS, AND METHODS
    25.
    发明公开
    MAGNETIC SENSING APPARATUS, SYSTEMS, AND METHODS 有权
    MAGNETISCHE ERFASSUNGSVORRICHTUNG，SYSTEME UND VERFAHREN

    公开(公告)号：EP2798377A4

    公开(公告)日：2015-01-21

    申请号：EP12865988

    申请日：2012-01-19

    申请人： HALLIBURTON ENERGY SERV INC

    发明人： RODNEY PAUL F

    IPC分类号： G01V3/40

    CPC分类号： G01V3/28 ,  E21B47/12 ,  G01V3/34 ,  G01V3/40

    摘要： In some embodiments, an apparatus and a system, as well as a method and an article, may operate to acquire a first signal from a first magnetometer at least partially disposed within a Helmholtz coil, to acquire a second signal from a second magnetometer having a sensitivity at least one thousand times less than the first magnetometer, to process the second signal to determine a drive signal, to drive the Helmholtz coil using the drive signal so as to null an ambient Earth magnetic field surrounding the first magnetometer, and to process the first signal as one of a down hole location signal or a down hole telemetry signal, the location signal to determine a range to a sub-surface object, and the telemetry signal to provide data from down hole drilling operations. Additional apparatus, systems, and methods are disclosed.

    摘要翻译： 在一些实施例中，装置和系统以及方法和物品可以操作以从至少部分地设置在亥姆霍兹线圈内的第一磁力计获取第一信号，以从具有第二磁力计的第二磁力计获取第二信号， 灵敏度比第一磁强计小至少一千倍，以处理第二信号以确定N驱动信号，以使用驱动信号驱动亥姆霍兹线圈，以便使包围第一磁力计的环境地磁场失效，并且处理 作为井下位置信号或井下遥测信号之一的第一信号，确定与子表面物体的距离的位置信号，以及用于从井下钻井作业提供数据的遥测信号。 公开了附加装置，系统和方法。

    SUB-AUDIO MAGNETICS INSTRUMENT
    27.
    发明授权
    SUB-AUDIO MAGNETICS INSTRUMENT 失效
    INFRA声磁强计

    公开(公告)号：EP0532604B1

    公开(公告)日：1996-04-03

    申请号：EP91910906.6

    申请日：1991-06-03

    申请人： UNIVERSITY PARTNERSHIPS PTY. LIMITED

    发明人： STANLEY, John, Geophysical Research Institute ,  CATTACH, Malcolm K., Geophysical Res. Institute ,  LEE, Stephen J., Geophysical Research Institute

    IPC分类号： G01V3/165 ,  G01V3/38 ,  G01V3/40 ,  G01V3/10 ,  G01V3/12 ,  G01V3/08

    CPC分类号： G01V3/15 ,  G01V3/08

    摘要： A method and a device for implementing the method, for geophysical surveying of an area (1) comprising continuous measurement of the earth's magnetic or electromagnetic field using a detector (6) held at a constant height (E) above the ground surface, in the order of one metre, while traversing in a criss-cross manner over the area (1) at speeds below a maximum speed (S), in the order of 10 km/h, and utilising measured signal frequencies below a cutoff (F), being approximately the maximum speed (S) divided by twice the detector height (E), to indicate spatial changes in the measured field. Traversal distance can be measured on board the host vehicle and a real time output supplied. Simultaneously, using the same detector (6) and artifically induced magnetic fields generated by an inductive (2b and/or galvanic source (2a)), temporal field changes of frequencies above the cutoff (F) can be measured and simply filtered out of the detector's (6) output for separate processing and storage. Temporal field changes below the cutoff (F) can be detected by a synchronised stationary detector inputting to the processing equipment (10) so as to subtract such signals from the signals used to measure spatial field changes.

    Non-superconducting apparatus for detecting magnetic and electromagnetic fields
    29.
    发明公开
    Non-superconducting apparatus for detecting magnetic and electromagnetic fields 失效
    检测磁场和电磁场的不超导设备。

    公开(公告)号：EP0326638A1

    公开(公告)日：1989-08-09

    申请号：EP88101700.8

    申请日：1988-02-05

    申请人： Rauscher, Elizabeth A. ,  Van Bise, William L.

    发明人： Rauscher, Elizabeth A. ,  Van Bise, William L.

    IPC分类号： G01R33/028 ,  G01R29/08 ,  G01V3/40

    CPC分类号： G01R33/028 ,  G01V3/40

    摘要： The present invention relates to an apparatus for detecting magnetic and electromagnetic waves or fields through use of non-superconducting materials. The present invention relates to apparatus which are used to measure such fields in order to predict earthquakes, volcanic eruptions and other violent earth movements which generate substantial aberrations in magnetic and electromagnetic fields. The present invention can be used to detect any fluctuating magnetic or electromagnetic fields regardless of their origin. The present invention incorporates the use of antennae for the electromagnetic components and coils to detect magnetic fields, in conjunction with electronic elements involving amplification, smoothing elements, frequency response networks, networks to make frequency response uniform within the band and notch filters where necessary.

    摘要翻译： 本发明涉及到用于通过使用非超导材料检测磁和电磁波或字段。 本发明涉及一种用于测量以预测地震，火山爆发和其他暴力地球运动哪产生磁场和电磁场大量像差搜索字段设备。 本发明可用于不论其来源的任何检测波动磁场或电磁场。 本发明包括使用天线的用于电磁组件和线圈来检测磁场，在与电子元件涉及扩增，平滑元件，频率响应网络，网络一起使带和陷波滤波器，其中有必要内频率响应均匀。