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公开(公告)号：US06637119B2
公开(公告)日：2003-10-28
申请号：US10072129
申请日：2002-02-05
IPC分类号： E21B4722
CPC分类号： E21B47/022
摘要： A borehole drilling and survey assembly includes a drill string of magnetic material, a non-magnetic drill collar, and a non-magnetic rotary drilling system including a drill bit. A near-bit survey instrument is located in the rotary drilling system at a fixed distance from the junction of the drill string and the drill collar. A second survey instrument is located in the drill collar at a fixed distance from said junction. The survey instruments measure the local values of the component of the earth's magnetic along the borehole axis, and these values are processed to remove the magnetic effects of the drillstring. The survey instruments optionally also measure gravity vector components to enable borehole heading to be derived.
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公开(公告)号：US4047439A
公开(公告)日：1977-09-13
申请号：US658866
申请日：1976-02-17
CPC分类号： G01P15/132
摘要： A linear accelerometer comprises a proof mass in the form of a permanent bar magnet located in a tube containing a magnetic fluid such as a liquid with particles of magnetic material suspended therein. A servo circuit responsive to A.C. energized sensing coils is used to energize a D.C. electromagnet to maintain the proof mass in a central position in the tube.
摘要翻译： 线性加速度计包括位于包含诸如液体的磁性流体的管中的永久棒状磁体形式的检测质量，其中悬浮有磁性材料的颗粒。 响应于交流感应线圈的伺服电路用于对直流电磁铁通电，以将检测质量保持在管中心位置。
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公开(公告)号：US3970877A
公开(公告)日：1976-07-20
申请号：US502227
申请日：1974-08-30
CPC分类号： E21B41/0085 , E21B21/08
摘要： The electrical power required to drive downhole drilling tools and/or measuring instruments is obtained using means responsive to turbulence in the mud flow past a unit forming part of the drill string. The responsive means may comprise a piezo-electric disc connected to rectifying and smoothing circuits whereby a D.C. output is obtained.
摘要翻译： 用于驱动井下钻具和/或测量仪器所需的电力是使用响应于泥浆流中经过形成钻柱的一部分的单元的湍流的装置获得的。 响应装置可以包括连接到整流和平滑电路的压电盘，由此获得直流输出。
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公开(公告)号：US3935642A
公开(公告)日：1976-02-03
申请号：US396634
申请日：1973-09-12
IPC分类号： E21B7/04 , E21B47/022
CPC分类号： E21B7/04 , E21B47/022
摘要： For the directional drilling of boreholes, the orientation or roll angle of the drill head or mud-motor in the borehole has to be ascertained for steering purposes. The roll angle is determined, during drilling, by sensing at the location of the drilling tool in the borehole the values of the earth's magnetic field strength in two axes transverse to the main tool axis, signalling these values to the drilling station and translating them according to the direction and inclination of the borehole axis, which are known and normally updated at intervals between drilling runs. The down-hole assembly, located in a fixed attitude to the mud-motor, requires only static magnetic sensors. A resolver in a surface indicating unit provides for the indication of the roll angle as the angle determined by the sensors, translated according to the borehole information by the addition of an angle precalculated and selected from tables, calculated in a computation center, or calculated by computation in the indicating unit.
摘要翻译： 对于钻孔的定向钻孔，为了转向目的，必须确定钻头中钻头或泥马达的取向或侧倾角度。 在钻孔期间，通过在钻孔中钻孔工具的位置处感测在横向于主工具轴的两个轴中的地球磁场强度的值来确定滚动角，将这些值发送给钻孔站并根据 相对于钻孔轴线的方向和倾角，这是已知的并且在钻井运行之间的间隔通常更新。 位于泥浆马达固定姿态的井下组件仅需要静磁传感器。 表面指示单元中的解算器提供滚动角度的指示，作为由传感器确定的角度，根据钻孔信息，通过添加从计算中心计算的表中预先计算和选择的角度来转换，或由 指示单元中的计算。
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公开(公告)号：US4083117A
公开(公告)日：1978-04-11
申请号：US726199
申请日：1976-09-24
IPC分类号： E21B47/022 , G01C9/02
CPC分类号： E21B47/022
摘要： Inclination and high side angle of a borehole is measured by a tool that may be positioned inside a drill string and lowered into the borehole. The tool includes three gravity transducers positioned in a novel array. The transducers are positioned in a case whose axis coincides with that of the borehole and are arranged with their axes angularly displaced from each other around the case axis by approximately 120 degrees and from the case axis by approximately 45 degrees. An array of fluxgate magnetic transducers may be added to the apparatus to provide combination surveying and steering capability.
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公开(公告)号：US3935643A
公开(公告)日：1976-02-03
申请号：US528391
申请日：1974-11-29
IPC分类号： G01C9/04 , E21B47/02 , E21B47/0228 , E21B47/0236 , G01C9/00 , G01C9/06 , G01C9/12 , G01C9/14
摘要： Apparatus is provided for measuring both the angle between the vertical and a particular axis of a body and the azimuth angle of the displacement of such axis from the vertical. The body houses a trasnducer having a bar magnet mounted on the free end of a pendulum beam and confronting four solenoids forming two differential fluxgate pairs disposed symmetrically with respect to the neutral position of the pendulum beam. The two differential fluxgate pairs are preferably so interconnected that the magnetic flux in each fluxgate pair is equal to zero.
摘要翻译： 提供了用于测量身体的垂直和特定轴线之间的角度以及该轴线与垂直线的位移的方位角的装置。 主体装有一个具有安装在摆梁的自由端上的杆状磁铁的传感器，并且面对形成相对于摆杆的中立位置对称设置的两个差动磁极门对的四个螺线管。 两个差分磁通门对优选地互连，使得每个磁通门对中的磁通量等于零。
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