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1.发明授权High sensitivity well logging system having dual transmitter antennas and intermediate series resonant 失效具有双发射天线和中间串联谐振的高灵敏度测井系统
公开(公告)号：US5081419A
公开(公告)日：1992-01-14
申请号：US697524
申请日：1991-04-29
摘要： A well logging apparatus and method for measuring the resistivity of the formation surrounding a borehole is disclosed. The invention provides two transmitting antennas arranged around a housing means or drill collar in spaced relation from one another. A transmitting circuit alternately supplies an oscillating drive signal to each transmitting antenna with a sufficiently high frequency such that one and then the other of the transmitting antennas radiates an electromagnetic wave signal which propagates through the formation. Two receiving antennas are located equally spaced between the transmitting antennas to produce pick-up signals from the electromagnetic wave propagating through the formation. Each receiving antenna includes a single turn coil connected in series with a capacitor to provide a reduced impedance circuit to resonate in the frequency region embracing the oscillating drive signal. Receive antenna circuitry responsive to induced alternating current in the coil produces a signal indicative of the formation parameter under study. The method of positioning two series resonant single turn receiving antennas tuned to the oscillating drive frequency and alternately coupling an electrical drive signal to a pair of transmitters spaced equally on each side of the receiving antennas allows receiving signals which are self-cancelling for system induced effects.
摘要翻译： 公开了用于测量围绕钻孔的地层的电阻率的测井装置和方法。 本发明提供了两个彼此间隔开的布置在壳体装置或钻铤周围的发射天线。 发射电路以足够高的频率向每个发射天线交替地提供振荡驱动信号，使得发射天线中的一个发射天线和另一个发射天线辐射通过地层传播的电磁波信号。 两个接收天线位于发射天线之间的距离相等的距离处，以产生从电磁波传播通过地层的拾取信号。 每个接收天线包括与电容器串联连接的单匝线圈，以提供减小的阻抗电路以在包含振荡驱动信号的频率区域中谐振。 响应于线圈中的感应交流电的接收天线电路产生指示正在研究的地层参数的信号。 将调谐到振荡驱动频率的两个串联谐振单匝接收天线定位并将电驱动信号交替地耦合到在接收天线的每一侧上均匀隔开的一对发射机的方法允许接收对于系统感应效应而自消除的信号 。
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2.发明授权
公开(公告)号：US5402068A
公开(公告)日：1995-03-28
申请号：US820091
申请日：1992-01-13
摘要： A logging-while-drilling system is disclosed which includes a pair of receiving antenna disposed between upper and lower transmitting antenna. The upper and lower transmitting antenna are energized successively to generate an electromagnetic wave which propagates through the formation surrounding the borehole. The amplitude attenuation and phase shift of the electromagnetic wave between the receiving antenna is measured. Measurements from both the upper and lower transmitting antenna can be combined to eliminate by cancellation system error components. In order to further improve the performance of the logging-while-drilling system, separate and dedicated driver circuits are provided proximate each transmitter. In addition, reference signals which are utilized to coordinate and synchronize the operation of the various components of the logging-while-drilling system are provided at frequencies which are substantially different from the interrogation frequency of the electromagnetic interrogation signal.
摘要翻译： 公开了一种记录钻井系统，其包括设置在上部和下部发射天线之间的一对接收天线。 上下发射天线依次通电，产生电磁波，该电磁波传播穿过钻孔周围的地层。 测量接收天线之间电磁波的振幅衰减和相移。 可以组合上下发射天线的测量结果，以消除系统误差分量。 为了进一步提高测井同步钻井系统的性能，在每个发射机附近提供独立和专用的驱动电路。 此外，用于协调和同步钻井同步钻井系统的各种部件的参考信号以与电磁询问信号的询问频率基本不同的频率提供。
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公开(公告)号：US4904865A
公开(公告)日：1990-02-27
申请号：US177389
申请日：1988-04-01
摘要： Improved radioactivity well logging by mounting a scintillator in a hole extending through a drill collar at the lower end of a drill string so that measurements can be made while drilling. Radioactive sources (when required for well logging) are mounted in cavities which open to the exterior of the drill collar. Light from the scintillator is coupled through a right-angle prism or fiber optics through an angle of about 90.degree. so that an elongated photomultiplier tube can be mounted within a housing within the drill collar with the longitudinal axis of the photomultiplier tube extending substantially parallel to the axis of the drill collar to provide maximum cross sectional area for flow of drilling fluid with the housing in the drill collar.
摘要翻译： 通过将闪烁体安装在延伸穿过钻柱下端的钻铤的孔中以改进放射性测井，以便在钻井时进行测量。 放射源（当测井所需时）安装在通向钻铤外部的空腔中。 来自闪烁体的光通过直角棱镜或光纤耦合到约90°的角度，使得细长的光电倍增管可以安装在钻铤内的壳体内，光电倍增管的纵轴基本上平行于 钻铤的轴线，以提供最大横截面面积，用于钻井液体与钻铤中的壳体的流动。
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4.发明授权Externally mounted radioactivity detector for MWD employing radial inline scintillator and photomultiplier tube 失效MWD的外置放射性检测器采用径向直列闪烁体和光电倍增管
公开(公告)号：US5061849A
公开(公告)日：1991-10-29
申请号：US485041
申请日：1990-02-26
摘要： Improved radioactivity well logging by mounting a scintillator and photomultiplier tube in a single case interfacing with a hole extending through a drill collar at the lower end of a drill string so that measurements can be made while drilling. Radioactive sources (when required for well logging) are mounted in cavities which open to the exterior of the drill collar. Light from the scintillator is coupled directly to the aligned photomultiplier tube both of which are mounted in a case extending radially within the drill collar and sealingly engaging an electronics housing within the drill collar and the drill collar wall surrounding the hole. The scintillator is of greater diameter than the photomultiplier tube. A frustoconical light pipe connects the scintillator and the photomultiplier tube, channeling scintillation in the crystal to the photomultiplier to provide an amplified detection capability over that for a scintillator having the same diameter as the photomultiplier tube.
摘要翻译： 通过将闪烁体和光电倍增管安装在与穿过钻柱下端延伸穿过钻铤的孔连接的单个壳体中来改善放射性测井，以便在钻孔时进行测量。 放射源（当测井所需时）安装在通向钻铤外部的空腔中。 来自闪烁体的光直接耦合到对准的光电倍增管，两者均安装在径向在钻铤内延伸的壳体中，并密封地接合钻铤内的电子设备壳体和围绕孔的钻铤壁。 闪烁体的直径大于光电倍增管的直径。 截头圆锥形光管连接闪烁体和光电倍增管，将晶体中的闪烁物引导到光电倍增管，以提供比具有与光电倍增管相同直径的闪烁体的放大检测能力。
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公开(公告)号：US5175429A
公开(公告)日：1992-12-29
申请号：US753322
申请日：1991-08-30
CPC分类号： G01V5/04 , E21B47/082 , E21B47/124
摘要： The present invention relates generally to increasing the accuracy of MWD nuclear based measurement systems. Specifically, the present invention provides a secondary measurement system for determining the tool displacement from the bore-hole wall for calculated compensation of nuclear measurement data.
摘要翻译： 本发明一般涉及增加基于MWD核的测量系统的精度。 具体地说，本发明提供了一种二次测量系统，用于确定用于计算的核测量数据补偿的钻孔壁的刀具位移。
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公开(公告)号：US4471435A
公开(公告)日：1984-09-11
申请号：US289359
申请日：1981-08-03
申请人： James E. Meisner
发明人： James E. Meisner
CPC分类号： G01V5/102
摘要： A computer-based well logging system is disclosed, for acquiring nuclear well log data, including gamma ray energy spectrum and neutron population decay rate data, and providing a real-time preentation of the data on an operator's display based on a traversal by a downhole instrument of a prescribed borehole depth interval.For acquiring energy spectrum data, the system has a multichannel analyzer including a pulse height analyzer and a memory. After a spectral gamma ray pulse signal coming from a downhole instrument over a logging cable is amplified and conditioned, the pulse height analyzer converts the pulse height into a digital code by peak detection, sample-and-hold action, and analog-to-digital conversion. The digital code defines the address of a memory location, or channel, corresponding to a particular gamma ray energy and having a count value to be incremented. After a period of time, the memory channels contain a spectrum of counts per incremental energy band. The spectrum data is then accessed by the system central processing unit (CPU) for analysis, and routed to the operator's display for presentation as a plot of relative gamma ray emissions activity versus energy level.For acquiring neutron decay rate data, the system has a multichannel scaling unit including a memory and a memory address generator. After a burst of neutrons downhole, thermal and epithermal neutron detector pulses build up and die away.Using the neutron source trigger as an initializing reference, the address generator produces a sequence of memory address codes, each code addressing the memory for a prescribed period of time, so as to define a series of time slots. A detector pulse signal produced during a time slot results in the incrementing of the count value in an address memory location. The process is repeated for every trigger, resulting in the production of time histogram data. The data is accessed by the CPU and routed to the operator's display.
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