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1. 发明授权

US06212476B1 Apparatus to measure the earth's local gravity and magnetic field in conjunction with global positioning attitude determining 有权
标题翻译：用于测量地球局部重力和磁场的设备，结合全球定位姿态决定
公开(公告)号：US06212476B1
公开(公告)日：2001-04-03
申请号：US09309864
申请日：1999-05-11
申请人： Koen Antonie Noy , Robert Alan Estes , Hatem Salem Morsy
发明人： Koen Antonie Noy , Robert Alan Estes , Hatem Salem Morsy
IPC分类号： E21B4722
CPC分类号： E21B47/022 , G01C17/30 , G01C21/18 , G01S19/14 , G01S19/53
摘要： A processor uses signals from at least two GPS receivers and a 3-component accelerometer located on a stable non-magnetic platform to determine the roll, yaw and pitch angles of the platform, thus providing a measurement of geographic north. The processor also uses signals from a 3-component magnetometer on the platform to determine the magnetic north and thence the magnetic declination. A proton magnetometer is used to provide a check on the measurements of the 3-component magnetometer. Additionally, three single component magnetometers provide a measure of the local magnetic field gradient and serve to monitor artificially induced magnetic fields. An alternate embodiment of the invention uses at least three GPS receivers and may dispense with the 3-component of accelerometer to determine geographic north. Temporal local variations of the earth's magnetic field are tracked and used to correct conventional magnetic well surveys. For use in offshore drilling applications where the rig is on a drillship, the platform floats on water away from the drillship and tethered to a buoy. Signals from an inertial motion sensor are used by the processor to correct the observations of the GPS sensors, the magnetometers and the accelerometers for the motion of the platform in water.
摘要翻译：处理器使用位于稳定非磁性平台上的至少两个GPS接收器和3组分加速度计的信号来确定平台的滚动，偏航和俯仰角，从而提供对北部地理位置的测量。处理器还使用来自平台上的3分量磁力计的信号来确定磁北极，从而确定磁偏角。质子磁强计用于提供对三组分磁强计测量的检查。另外，三个单分量磁力计提供局部磁场梯度的测量，并用于监测人为感应的磁场。本发明的替代实施例使用至少三个GPS接收器，并且可以免除加速度计的3分量以确定北部地理位置。跟踪和使用地球磁场的时间局部变化来纠正传统的磁场测量。对于钻机在钻井船上的海上钻井应用场合，该平台将浮在水面上，远离钻井船并拴在浮标上。来自惯性运动传感器的信号由处理器用于校正GPS传感器，磁力计和加速度计对于平台在水中的运动的观察。

2. 发明授权

US6151553A Measurement-while-drilling assembly using gyroscopic devices and methods of bias removal 有权
公开(公告)号：US6151553A
公开(公告)日：2000-11-21
申请号：US204908
申请日：1998-12-03
申请人： Robert A. Estes , Koen Antonie Noy , Jon B. Kahn
发明人： Robert A. Estes , Koen Antonie Noy , Jon B. Kahn
摘要： This invention provides a measurement-while-drilling (MWD) downhole assembly for use in drilling boreholes which utilizes gyroscopes, magnetometers and accelerometers for determining the borehole inclination and azimuth during the drilling of the borehole. The downhole assembly includes at least one gyroscope that is rotatably mounted in a tool housing to provide signals relating to the earth's rotation. A device in the tool can rotate the gyroscope and other sensors on the tool at any desired degree. A processor in the tool combines measurements from the sensors taken at a plurality of positions at the same depth to determine the systematic bias in the sensors before further processing. Accelerometers in the MWD tool provide gravity measurements from which the toolface and inclination are determined. The unbiased gyroscopic measurements are used in conjunction with the tool face and inclination measurements to determine the azimuth and tool face with respect to true north. Three axially spaced apart magnetometers may be used to correct for local magnetic disturbances. Additionally, when measurements are made with magnetic, accelerometer and gyroscopic measurements along three different axes, the unbiased measurements may be combined to provide an improved determination of the tool orientation.

3. 发明授权

US06347282B1 Measurement-while-drilling assembly using gyroscopic devices and methods of bias removal 有权
公开(公告)号：US06347282B1
公开(公告)日：2002-02-12
申请号：US09204908
申请日：1998-12-03
申请人： Robert A. Estes , Koen Antonie Noy , Jon B. Kahn
发明人： Robert A. Estes , Koen Antonie Noy , Jon B. Kahn
IPC分类号： G01V148
摘要： This invention provides a measurement-while-drilling (MWD) downhole assembly for use in drilling boreholes which utilizes gyroscopes, magnetometers and accelerometers for determining the borehole inclination and azimuth during the drilling of the borehole. The downhole assembly includes at least one gyroscope that is rotatably mounted in a tool housing to provide signals relating to the earth's rotation. A device in the tool can rotate the gyroscope and other sensors on the tool at any desired degree. A processor in the tool combines measurements from the sensors taken at a plurality of positions at the same depth to determine the systematic bias in the sensors before further processing. Accelerometers in the MWD tool provide gravity measurements from which the toolface and inclination are determined. The unbiased gyroscopic measurements are used in conjunction with the tool face and inclination measurements to determine the azimuth and tool face with respect to true north. Three axially spaced apart magnetometers may be used to correct for local magnetic disturbances. Additionally, when measurements are made with magnetic, accelerometer and gyroscopic measurements along three different axes, the unbiased measurements may be combined to provide an improved determination of the tool orientation.

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