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75 条记录 (耗时 0.007 秒)

    Mud pump noise cancellation system
    71.
    发明公开
    Mud pump noise cancellation system 失效
    System zurUnterdrückungdesGeräuscheseiner Schlammpumpe。

    公开(公告)号：EP0535729A2

    公开(公告)日：1993-04-07

    申请号：EP92202902.0

    申请日：1992-09-22

    申请人： Anadrill International SA ,  SERVICES PETROLIERS SCHLUMBERGER

    发明人： Kosmala, Alexandre ,  Malone, David ,  Masak, Peter

    IPC分类号： E21B47/12

    CPC分类号： E21B47/18 ,  E21B47/182

    摘要： Methods for recovering a LWD or MWD data signal in the presence of mud pump noise are provided and generally comprise calibrating the drilling mud pressure as a function of the mud pump piston position, and then tracking the piston position during transmission of the LWD or MWD data signal and using the calibration information to subtract out the mud pump noise. Calibration is accomplished in the absence of the LWD or MWD data signal to provide a correlation between mud pump piston position and the drilling mud pressure. Then, when the LWD or MWD data signal is being generated, the mud pump piston position is tracked such that the pressure due to the pump can be subtracted and the LWD or MWD signal recovered. Where a plurality of mud pumps are being utilized, calibration is accomplished by running the mud pumps together in the absence of the LWD or MWD data signal, and processing the received mud pressure signals in the Fourier domain to allocate respective portions of the mud pressure signals to respective mud pumps such that each mud pump is provided with a signature as a function of its own piston position. With the piston position of each mud pump being tracked, the sum of the mud pressure signals generated by the mud pumps based on their piston positions is subtracted from the total received signal to recover the LWD or MWD signal.

    摘要翻译： 提供了在存在泥浆泵噪声的情况下恢复LWD或MWD数据信号的方法，并且通常包括根据泥浆泵活塞位置来校准钻井泥浆压力，然后在传动LWD或MWD数据期间跟踪活塞位置 信号和使用校准信息减去泥浆泵噪声。 在没有LWD或MWD数据信号的情况下进行校准，以提供泥浆泵活塞位置和钻井泥浆压力之间的相关性。 然后，当生成LWD或MWD数据信号时，跟踪泥浆泵活塞位置，使得可以减去由泵引起的压力，并恢复LWD或MWD信号。 在利用多个泥浆泵的情况下，通过在没有LWD或MWD数据信号的情况下将泥浆泵一起运行并且在傅立叶域中处理接收到的泥浆压力信号来分配泥浆压力信号的各个部分来实现校准 到相应的泥浆泵，使得每个泥浆泵具有作为其自身活塞位置的函数的签名。 随着每个泥浆泵的活塞位置被跟踪，从泥浆泵产生的基于其活塞位置的泥浆压力信号的总和从总接收信号中减去以恢复LWD或MWD信号。

    Signal transmitters
    72.
    发明公开
    Signal transmitters 失效
    信号发射机

    公开(公告)号：EP0325047A3

    公开(公告)日：1990-05-09

    申请号：EP88312088.3

    申请日：1988-12-21

    申请人： Russell, Michael King ,  Russell, Anthony William

    发明人： Russell, Michael King ,  Russell, Anthony William

    IPC分类号： E21B47/12

    CPC分类号： E21B47/182 ,  E21B47/18

    摘要： A transmitter 1 comprises an impeller assembly 7 rotatable by a liquid flow, and an electrical generator 8 having a stator and a rotor arranged to be driven by the impeller assembly 7. The impeller assembly 7 comprises a main impeller portion 9 and a secondary impeller portion 10 angularly displaceable relative to one another about the axis of rotation of the impeller assembly 7 in response to a change in load of the generator 8 so as to vary the pressure drop across the rotating impeller assembly 7. Thus appropriate variation of the load of the generator 8 may be used to control the impeller assembly 7 in such a manner as to transmit pressure signals within the liquid flow. Such a transmitter 1 is particularly suitable for transmitting measurement data to the surface from a measuring instrument at the end of a drill string within a borehole. Furthermore such a transmitter can be constructed so as to be readily retrievable without requiring withdrawal of the drill string from the borehole.

    Pressure pulse generator
    75.
    发明公开
    Pressure pulse generator 失效
    压力脉动发电机

    公开(公告)号：EP0140788A3

    公开(公告)日：1986-01-29

    申请号：EP84402124

    申请日：1984-10-23

    申请人： SCHLUMBERGER TECHNOLOGY CORPORATION

    发明人： Trevino, Jose A. ,  Chin, Wilson C.

    IPC分类号： E21B47/12

    CPC分类号： E21B47/182 ,  E21B47/18

    摘要： An improved acoustic signal generator has rotor and stator elements, each having a plurality of radially-extending lobes and intervening ports relatively positioned and configured to establish fluid dynamic forces that bias the generator into an open position, thereby imparting a «stable open» characteristic to the generator. The rotor is located downstream of the stator, and rotor lobes are outwardly tapered in the downstream direction and have underlap relative to the upstream stator lobes. The invention is especially suited for use in oil industry MWD operations to communicate downhole measurement data to a well surface during drilling. In one embodiment, undercuts on the rotor lobes impart a flutter action which clears debris.