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公开(公告)号：US4457168A
公开(公告)日：1984-07-03
申请号：US474064
申请日：1983-03-10
CPC分类号： G01V7/04
摘要： An automated borehole gravity meter system for measuring gravity within a wellbore. The gravity meter includes leveling devices for leveling the borehole gravity meter, displacement devices for applying forces to a gravity sensing device within the gravity meter to bring the gravity sensing device to a predetermined or null position. Electronic sensing and control devices are provided for (i) activating the displacement devices, (ii) sensing the forces applied to the gravity sensing device, (iii) electronically converting the values of the forces into a representation of the gravity at the location in the wellbore, and (iv) outputting such representation. The system further includes electronic control devices with the capability of correcting the representation of gravity for tidal effects, as well as, calculating and outputting the formation bulk density and/or porosity.
摘要翻译： 一种用于测量井筒内重力的自动钻孔重力计系统。 重力计包括用于调平钻孔重力计的排水装置，用于将力施加到重力计中的重力感测装置的位移装置，以使重力感测装置处于预定或无效位置。 提供电子感测和控制装置用于（i）启动位移装置，（ii）感测施加到重力感测装置的力，（iii）将力的值电子地转换为重力表示在 井眼，（iv）输出此类表示。 该系统还包括能够校正潮汐影响的重力表现的能力的电子控制装置，以及计算和输出地层体积密度和/或孔隙率。
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公开(公告)号：US5440928A
公开(公告)日：1995-08-15
申请号：US941395
申请日：1992-09-08
CPC分类号： G01V7/08
摘要： A gravity meter includes a support framework which supports a suspension system having a weight beam to which a reaction mass is attached. The reaction mass includes a dielectric mass which extends partially within first and second cavities formed between respective first and second pairs of conductors. Changes in either the ambient gravitational field or the electric potential on the conductors causes the dielectric mass to move into the first cavity between the first pair of conductors and out of the second cavity between the second pair of conductors or vice-versa, with the force on the dielectric mass being linearly proportional to the voltage between the conductors. An optical detector system determines the position of the weight beam, thus the position of the dielectric mass, and is connected to the voltage source for the plates so that, by adjusting the electric potential between the plates, the weight beam can be moved to a nulled position. Subsequent changes in the ambient gravitational field caused either by movement of the meter or by a change in the ambient gravitational field over time will cause the reaction mass to move and cause the dielectric to move between the respective pairs of conductors. Thus, the required change in the electric potential necessary to renull the system allows remote calculation of the change in the gravitational field.
摘要翻译： 重力计包括支撑框架，其支撑具有附接有反作用物质的重量梁的悬架系统。 反应物料包括在相应的第一和第二对导体之间形成的第一和第二空腔内部分延伸的电介质。 环境引力场或导体上的电位的变化导致电介体质量移动到第一对导体之间的第一空腔中，并在第二对导体之间移出第二腔，反之亦然， 介电质量与导体之间的电压成线性比例。 光学检测器系统确定重量光束的位置，从而确定介质质量的位置，并连接到板的电压源，使得通过调节板之间的电位，重量光束可以移动到 无效位置。 随后随着仪表的移动或环境重力场随时间的变化而引起的环境重力场的后续变化将导致反作用物质移动并导致电介质在各对导体之间移动。 因此，对系统进行必要的电位变化允许远程计算重力场的变化。
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公开(公告)号：US4215578A
公开(公告)日：1980-08-05
申请号：US39409
申请日：1979-05-15
IPC分类号： G01V7/12
CPC分类号： G01V7/12
摘要： A gravity gradiometer using at least one mass dipole mounted in a laser force-measurement system to detect the torque on the mass dipole generated by gravity gradient. The mass dipole is mounted on one end of a photoelastic modulator element positioned in the laser beam to differentially modulate circular polarization modes in response to application of a torque. In a preferred form, two mass dipoles are mounted on opposite ends of the modulator element which is rigidly supported at its center to improve noise rejection.
摘要翻译： 使用安装在激光力测量系统中的至少一个质量偶极子的重力梯度计来检测由重力梯度产生的质量偶极子上的扭矩。 质量偶极子安装在位于激光束中的光弹性调制器元件的一端，以响应于扭矩的差异来调制圆偏振模式。 在优选形式中，两个质量偶极子安装在调制器元件的相对端上，该调制器元件在其中心处被刚性支撑以改善噪声抑制。
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公开(公告)号：US4255969A
公开(公告)日：1981-03-17
申请号：US111420
申请日：1980-01-11
CPC分类号： H01S3/0007 , G01V7/10 , H01S3/083
摘要： Gravity gradiometer including a ring laser cavity, two modulator elements in the path of the laser beam, and spaced masses attached to the modulator elements to provide a differential modulation of circular polarization modes proportional to the difference in gravity at the location of the two masses. In one form, a biasing element is added to shift the operating point of the laser system to improve performance.
摘要翻译： 重力梯度计包括环形激光腔，激光束路径中的两个调制器元件，以及附着到调制器元件的间隔的质量块，以提供与两个质量块的位置处的重力差成比例的圆偏振模式的差分调制。 在一种形式中，添加偏置元件以移动激光系统的操作点以改善性能。
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公开(公告)号：US4252190A
公开(公告)日：1981-02-24
申请号：US13958
申请日：1979-02-22
CPC分类号： E21B19/10 , E21B19/09 , E21B19/22 , E21B47/0001
摘要： Downhole variations in wireline cable tension are substantially reduced for offshore exploration by means of an auxiliary cable tensioning system preferably installed at the ocean floor wellhead. Part of the lifting force applied to a wireline cable is provided by the wireline stabilization tool at the wellhead so that fluctuations in wireline tension above the wellhead caused by ocean disturbances on the floating platform will be effectively filtered out and isolated from the main cable downhole from the wellhead. This downhole isolation is achieved with a moving wireline as well as with a stationary cable.
摘要翻译： 通过优选安装在海底井口处的辅助缆索张紧系统，用于海上勘探的电缆缆索张力的井下变化大大降低。 施加到有线电缆的部分提升力由井口处的电缆稳定工具提供，使得浮动平台上的海洋干扰导致的井口以上的电缆张力波动将被有效地从井下的主电缆中过滤掉 井口。 这种井下隔离是通过移动的电缆线和固定电缆实现的。
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公开(公告)号：US4581932A
公开(公告)日：1986-04-15
申请号：US684815
申请日：1984-12-20
CPC分类号： G01V7/10
摘要： A tuned borehole gravity gradiometer comprises a dipole mass system having means for selectively tuning the sensitivity of the gravity gradiometer to detect variations in the earth's gravity gradient within a borehole. The tuning means includes varying the metacentric height of the dipole mass system by selectively varying the center of gravity of the dipole mass system with respect to the metacenter of the dipole mass system.
摘要翻译： 调谐钻孔重力梯度计包括具有用于选择性地调节重力梯度计的灵敏度以检测井眼内的地球重力梯度的变化的装置的偶极质量系统。 调谐装置包括通过相对于偶极子质量系统的中心选择性地改变偶极子质量系统的重心来改变偶极子质量系统的中心高度。
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公开(公告)号：US4513618A
公开(公告)日：1985-04-30
申请号：US364740
申请日：1982-04-02
CPC分类号： G01V7/08
摘要： Method and apparatus for determining the vertical gradient of the vertical gravitational field by a single measurement, for example, adjacent an earth formation of interest, are provided.
摘要翻译： 提供了通过单个测量来确定垂直重力场的垂直梯度的方法和装置，例如邻近感兴趣的地球形成。
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公开(公告)号：US4458340A
公开(公告)日：1984-07-03
申请号：US367135
申请日：1981-04-09
CPC分类号： G01V1/44
摘要： A sonic transmitter and receiver are employed to locate and evaluate zones of significant porosity in the proximity of a borehole. Continuous wave and pulse techniques are used to locate the zones and to determine the void dimensions by means of frequency domain signatures. Both through-transmission and reflection methods are employed. The technique is considered especially useful for locating fluid-filled vugular zones.
摘要翻译： 声波发射器和接收器用于定位和评估钻孔附近的显着孔隙度的区域。 使用连续波和脉冲技术来定位区域并通过频域签名来确定空隙尺寸。 采用透射和反射方法。 该技术被认为特别适用于定位充满流体的血栓形成区域。
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公开(公告)号：US4445371A
公开(公告)日：1984-05-01
申请号：US373327
申请日：1982-04-30
IPC分类号： G01V7/00
摘要： Measurements of the gravitational field are made by generating a frequency representative of the gravitational field. In one aspect, the frequency is generated by oscillations in a magnetic vibrator formed by magnets having vertically opposed magnetic poles.
摘要翻译： 通过产生代表重力场的频率来产生重力场的测量。 在一个方面，通过由具有垂直相对的磁极的磁体形成的磁振子中的振荡产生频率。
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公开(公告)号：US4955232A
公开(公告)日：1990-09-11
申请号：US359454
申请日：1989-05-31
IPC分类号： G01V7/02
CPC分类号： G01V7/02
摘要： An apparatus and method for measuring the vertical gradient of the vertical gravitational field using a gravity gradiometer comprising a housing containing a fluid, a float buoyantly supported within the fluid, mechanism for varying the metacentric height of the float, and apparatus for obtaining a measure of the gravitational gradient acting on the float resulting from varying the metacentric height.
摘要翻译： 一种用于使用重力梯度计测量垂直重力场的垂直梯度的装置和方法，所述重力梯度计包括包含流体的壳体，浮动地支撑在流体内的浮子，用于改变浮子的中心高度的机构，以及用于获得 作用在浮子上的重力梯度由于改变中心高度而产生。
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