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公开(公告)号：US20230349723A1
公开(公告)日：2023-11-02
申请号：US18194903
申请日：2023-04-03
IPC分类号： G01C25/00 , G01C17/38 , E21B47/022 , G01R35/00
CPC分类号： G01C25/005 , G01C17/38 , E21B47/022 , G01R35/005
摘要： An improved total field calibration system and method is disclosed for reducing the rotational misalignment between magnetic and gravity sensors in a directional sensing system. A method of calibrating a tri-axial directional sensor comprising orthonormal accelerometers and orthonormal magnetometers, comprises measuring Earth's magnetic and gravity fields with said directional sensor in at least 4 sensor orientations; obtaining at least one reference field value of dip drift of Earth's magnetic field from at least one source independent of said directional sensor corresponding to said orientations; and, determining and applying rotational misalignments between said magnetometers and said accelerometers so that measured magnetic dip drifts are substantially equal to said reference values. The calibration process can be performed without monitoring the declination change during the calibration process. Directional sensing systems can be calibrated accurately during a period when the Earth's magnetic field changes rapidly.
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公开(公告)号：US11682821B2
公开(公告)日：2023-06-20
申请号：US17082295
申请日：2020-10-28
发明人： Jian-Qun Wu
摘要： Methods for sensing formation properties while drilling a well are described. An antenna system and transceiver electronics system are disposed on a drill collar segment. The antenna system includes at least one transmitter antenna for creating an electromagnetic field and at least one receiver antenna for detecting the electromagnetic field. At least one antenna in the antenna system is a magnetic dipole based antenna having at least two slot based magnetic dipoles. The slot based magnetic dipoles include slots in an outer surface of the drill collar segment, wire holes beneath the outer surface connecting the slots with each other and with the transceiver electronics system, a ferrite rod placed in each slot, and, at least one continuous antenna wire passing through the slots and the wire holes.
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公开(公告)号：US20210124080A1
公开(公告)日：2021-04-29
申请号：US17080104
申请日：2020-10-26
发明人： Jian-Qun Wu
IPC分类号： G01V3/30
摘要： An electromagnetic tool using slotted dipole antennas is presented. The dipoles may be placed in slots on a drill collar. A receiver or transmitter antenna consists of one or more slots. A dipole consists of a ferrite rod with electric wires placed above and below the ferrite. Wires may be connected such that wire current forms a loop around the ferrite rod. When a group of slots are used for an antenna, wire holes are constructed between slots. Effectively a single wire may be used to go above all ferrite rods in the group and then turn to go below all the rods. Two wire segments are in a wire hole connecting two adjacent slots. Currents in the two segments are the same in magnitudes and flow in opposite directions. There is no net current in wires in a wire hole.
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公开(公告)号：US20210126337A1
公开(公告)日：2021-04-29
申请号：US17082295
申请日：2020-10-28
发明人： Jian-Qun Wu
摘要： Methods for sensing formation properties while drilling a well are described. An antenna system and transceiver electronics system are disposed on a drill collar segment. The antenna system includes at least one transmitter antenna for creating an electromagnetic field and at least one receiver antenna for detecting the electromagnetic field. At least one antenna in the antenna system is a magnetic dipole based antenna having at least two slot based magnetic dipoles. The slot based magnetic dipoles include slots in an outer surface of the drill collar segment, wire holes beneath the outer surface connecting the slots with each other and with the transceiver electronics system, a ferrite rod placed in each slot, and, at least one continuous antenna wire passing through the slots and the wire holes.
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公开(公告)号：US11616284B2
公开(公告)日：2023-03-28
申请号：US17080104
申请日：2020-10-26
发明人： Jian-Qun Wu
摘要： An electromagnetic tool using slotted dipole antennas is presented. The dipoles may be placed in slots on a drill collar. A receiver or transmitter antenna consists of one or more slots. A dipole consists of a ferrite rod with electric wires placed above and below the ferrite. Wires may be connected such that wire current forms a loop around the ferrite rod. When a group of slots are used for an antenna, wire holes are constructed between slots. Effectively a single wire may be used to go above all ferrite rods in the group and then turn to go below all the rods. Two wire segments are in a wire hole connecting two adjacent slots. Currents in the two segments are the same in magnitudes and flow in opposite directions. There is no net current in wires in a wire hole.
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公开(公告)号：US20180143036A1
公开(公告)日：2018-05-24
申请号：US15862198
申请日：2018-01-04
IPC分类号： G01C25/00 , G01C17/38 , G01R35/00 , E21B47/022
CPC分类号： G01C25/005 , E21B47/022 , G01C17/38 , G01R35/005
摘要： An improved total field calibration system and method is disclosed for reducing the rotational misalignment between magnetic and gravity sensors in a directional sensing system. A method of calibrating a tri-axial directional sensor comprising orthonormal accelerometers and orthonormal magnetometers, comprises measuring Earth's magnetic and gravity fields with said directional sensor in at least 4 sensor orientations; obtaining at least one reference field value of dip drift of Earth's magnetic field from at least one source independent of said directional sensor corresponding to said orientations; and, determining and applying rotational misalignments between said magnetometers and said accelerometers so that measured magnetic dip drifts are substantially equal to said reference values. The calibration process can be performed without monitoring the declination change during the calibration process. Directional sensing systems can be calibrated accurately during a period when the Earth's magnetic field changes rapidly.
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公开(公告)号：US09863785B2
公开(公告)日：2018-01-09
申请号：US14991726
申请日：2016-01-08
IPC分类号： G01C25/00 , G01R35/00 , G01P21/00 , E21B47/022 , G01C17/38
CPC分类号： G01C25/005 , E21B47/022 , G01C17/38 , G01R35/005
摘要： An improved total field calibration system and method is disclosed for reducing the rotational misalignment between magnetic and gravity sensors in a directional sensing system. A method of calibrating a tri-axial directional sensor that includes orthonormal accelerometers and orthonormal magnetometers is disclosed. The method includes measuring Earth's magnetic and gravity fields with said directional sensor in at least 4 sensor orientations; obtaining at least one reference field value of dip drift of Earth's magnetic field from at least one source independent of said directional sensor corresponding to said orientations; and, determining and applying rotational misalignments between said magnetometers and said accelerometers so that measured magnetic dip drifts are substantially equal to said reference values. The calibration process can be performed without monitoring the declination change during the calibration process. Directional sensing systems can be calibrated accurately during a period when the Earth's magnetic field changes rapidly.
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公开(公告)号：US09250100B2
公开(公告)日：2016-02-02
申请号：US14572569
申请日：2014-12-16
IPC分类号： G01C25/00 , G01R35/00 , G01P21/00 , E21B47/022
CPC分类号： G01C25/005 , E21B47/022 , G01C17/38 , G01R35/005
摘要： An improved total field calibration system and method is disclosed for reducing the rotational misalignment between magnetic and gravity sensors in a directional sensing system. The effect of variation of surface components of the Earth's magnetic field during the calibration process on magnetometer misalignment may be completely eliminated by requiring the magnetic dip derived from the sensing system to match that of the Earth's field obtained from a reference source. The calibration process can be performed without monitoring the declination change during the calibration process. Directional sensing systems can be calibrated accurately during a period when the Earth's magnetic field changes rapidly.
摘要翻译： 公开了一种改进的总场校准系统和方法，用于减少方向感测系统中磁重力传感器与重力传感器之间的旋转失准。 校准过程中地球磁场的表面分量变化对磁力计失准的影响可以通过要求来自感测系统的磁倾角与从参考源获得的地球场的磁场倾斜相一致而完全消除。 校准过程可以在不监测校正过程中的偏角变化的情况下执行。 在地球磁场迅速变化的时期，可以精确地校准定向传感系统。
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公开(公告)号：US12119536B2
公开(公告)日：2024-10-15
申请号：US18190663
申请日：2023-03-27
发明人： Jian-Qun Wu
摘要： Slotted dipole antennas for use in an antenna system on a drill collar segment is presented. Dipoles may be placed in slots on the drill collar segment. A dipole consists of a ferrite rod with electric wires placed above and below the ferrite rod. Wires may be connected such that wire current forms a loop around the ferrite rod. When a group of slots are used for an antenna, wire holes are constructed between slots. Effectively a single wire may be used to go above all ferrite rods in the group and then turn to go below all the ferrite rods. Two wire segments are in a wire hole connecting two adjacent slots. Currents in the two segments are the same in magnitudes and flow in opposite directions. There is no net current in wires in a wire hole.
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公开(公告)号：US20230238680A1
公开(公告)日：2023-07-27
申请号：US18190663
申请日：2023-03-27
发明人： Jian-Qun Wu
摘要： Slotted dipole antennas for use in an antenna system on a drill collar segment is presented. Dipoles may be placed in slots on the drill collar segment. A dipole consists of a ferrite rod with electric wires placed above and below the ferrite rod. Wires may be connected such that wire current forms a loop around the ferrite rod. When a group of slots are used for an antenna, wire holes are constructed between slots. Effectively a single wire may be used to go above all ferrite rods in the group and then turn to go below all the ferrite rods. Two wire segments are in a wire hole connecting two adjacent slots. Currents in the two segments are the same in magnitudes and flow in opposite directions. There is no net current in wires in a wire hole.
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