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    • 3. 发明授权
    • Wireline formation tester supercharge correction method
    • 电线形成测试仪增压校正方法
    • US5644076A
    • 1997-07-01
    • US614617
    • 1996-03-14
    • Mark A. ProettMargaret C. WaidWilson C. Chin
    • Mark A. ProettMargaret C. WaidWilson C. Chin
    • E21B49/00E21B49/10E21B47/00
    • E21B49/10E21B49/008
    • An improved formation testing method increases the accuracy of in-situ formation pressure measurements by characterizing the mudcake properties. Specifically, after a formation tester is lowered to a desired depth within a wellbore, a pad is extended to gently abut and seal against the mudcake without disturbing the mudcake. When pressed against the mudcake, the pad experiences momentarily higher pressures, which are measured by a probe housed by the pad. These pressures may be enhanced by briefly rejecting fluids through the probe, so as to avoid disturbing the mudcake. The probe continues to measure pressure, which eventually decreases relative to hydrostatic pressure in the wellbore, due to the flow of high-pressure wellbore fluids through the mudcake. Since the rate of fluid flow outward into the formation is governed by the permeability of the mudcake, measuring the rate of pressure decline during this initial period provides useful data to more accurately estimate properties such as formation compressibility. Additionally, indicia of the mudcake properties themselves may be generated. After the initial mudcake tests, the formation tester may be used to perform drawdown and/or buildup tests, by a process of withdrawing or injection fluids into the formation through the mudcake.
    • 改进的地层测试方法通过表征泥浆性质来提高原位地层压力测量的准确度。 具体地说,在将地层测试仪降低到井眼内所需的深度之后,将垫延伸以轻轻地抵靠并密封在泥饼上,而不会干扰泥饼。 当压在泥饼上时,垫经历瞬间更高的压力,这是通过由垫容纳的探针来测量的。 这些压力可以通过简单地通过探针排出流体来增强,以避免干扰泥饼。 由于高压井眼流体通过泥饼的流动,探头继续测量压力,该压力最终相对于井筒中的静水压力而降低。 由于流入地层的流体流速由泥饼的渗透率决定,因此在初始阶段测量压力下降速率提供了更为准确的估计地层压缩性能的数据。 此外,可能产生泥饼性质本身的标记。 在初始泥饼测试之后,地层测试仪可以用于通过将泥浆从地层中抽出或注入流体的过程进行抽水和/或堆积测试。
    • 7. 发明授权
    • Turbo siren signal generator for measurement while drilling systems
    • US5740126A
    • 1998-04-14
    • US568081
    • 1995-12-06
    • Wilson C. ChinThomas E. Ritter
    • Wilson C. ChinThomas E. Ritter
    • E21B47/18G01V1/40
    • E21B47/182E21B47/18Y10S367/911Y10S367/912
    • A self-propelled turbo siren modulator assembly is disclosed for use in an MWD system. The turbo siren includes a fixed turbine deflector located upstream from a rotor, which in turn is located upstream from a fixed stator. Drilling mud flowing through the turbine deflector causes the rotor to rotate independent of any external drive device. The rotor and stator preferably have a similar configuration, which includes at least one lobe and at least one port so that the rotor alternatively blocks or permits mud flow through the port(s) of the stator to create a cyclical acoustic wave signal, with a frequency that depends upon the number of lobes on the rotor and the velocity of the drilling mud. Encoded measurement data is modulated on the carrier frequency wave through the use of amplitude modulation, frequency modulation or phase shift modulation, or a combination thereof to maximize data rates. In addition, a plurality of modulator assemblies may be provided, each of which includes a different number of lobes so as to operate at different, distinct frequencies to create a plurality of transmission channels in the drilling mud medium. These plurality of modulator assemblies therefore provide a plurality of separate carrier frequency signals on which data may be modulated to increase the rate at which data is transmitted to the surface of the well.
    • 9. 发明授权
    • Turbo siren signal generator for measurement while drilling systems
    • 涡轮警号信号发生器,用于测量钻井系统
    • US5586083A
    • 1996-12-17
    • US296109
    • 1994-08-25
    • Wilson C. ChinThomas E. Ritter
    • Wilson C. ChinThomas E. Ritter
    • E21B47/18C01V1/40
    • E21B47/182E21B47/18Y10S367/911Y10S367/912
    • A self-propelled turbo siren modulator assembly is disclosed for use in an MWD system. The turbo siren includes a fixed turbine deflector located upstream from a rotor, which in turn is located upstream from a fixed stator. Drilling mud flowing through the turbine deflector causes the rotor to rotate independent of any external drive device. The rotor and stator preferably have a similar configuration, which includes at least one lobe and at least one port so that the rotor alternatively blocks or permits mud flow through the port(s) of the stator to create a cyclical acoustic wave signal, with a frequency that depends upon the number of lobes on the rotor and the velocity of the drilling mud. Encoded measurement data is modulated on the carrier frequency wave through the use of amplitude modulation, frequency modulation or phase shift modulation, or a combination thereof to maximize data rates. In addition, a plurality of modulator assemblies may be provided, each of which includes a different number of lobes so as to operate at different, distinct frequencies to create a plurality of transmission channels in the drilling mud medium. These plurality of modulator assemblies therefore provide a plurality of separate carrier frequency signals on which data may be modulated to increase the rate at which data is transmitted to the surface of the well.
    • 公开了一种用于MWD系统中的自推进式涡扇警报调制器组件。 涡轮警报器包括位于转子上游的固定涡轮偏转器,转子又位于固定定子的上游。 流经涡轮偏转器的钻井泥浆使转子独立于任何外部驱动装置旋转。 转子和定子优选地具有类似的构造,其包括至少一个凸角和至少一个端口,使得转子交替地阻挡或允许泥浆流过定子的端口以产生循环声波信号,其中 频率取决于转子上的叶片数量和钻井泥浆的速度。 编码的测量数据通过使用幅度调制,频率调制或相移调制或其组合在载波频率波上进行调制,以最大化数据速率。 此外,可以提供多个调制器组件,每个调制器组件包括不同数量的叶片,以便以不同的不同频率操作,以在钻井泥浆介质中产生多个传输通道。 因此,这些多个调制器组件提供多个单独的载波频率信号,在该载波频率信号上可以调制数据以增加将数据传输到井的表面的速率。
    • 10. 发明授权
    • MWD surface signal detector having bypass loop acoustic detection means
    • MWD表面信号检测器具有旁路回路声检测装置
    • US5515336A
    • 1996-05-07
    • US292100
    • 1994-08-17
    • Wilson C. ChinWallace R. GardnerMargaret C. Waid
    • Wilson C. ChinWallace R. GardnerMargaret C. Waid
    • E21B47/18E21B47/06
    • E21B47/18
    • An acoustic detector in a mud pulse telemetry system includes a bypass loop in parallel with a section of the main mud line that supplies drilling mud to a drill string. The detector includes a pair of pressure sensing ports in the bypass line, and one or more pressure transducers for detecting the pressure at different locations in the bypass loop so that the differential pressure can be measured. The bypass loop has a small internal passageway relative to the main mud supply line and may include a constriction so as to create two regions in the passageway that differ in cross sectional areas. Forming the pressure sensing ports in the regions of differing cross sectional areas allows the pressure transducers to more precisely detect the mud pulse signals. Because of its relatively small cross sectional area, only a small fraction of the drilling mud flows through the bypass loop. The bypass loop may thus be constructed of hydraulic hose and a relatively small rigid body having a central through bore.
    • 泥浆脉冲遥测系统中的声学检测器包括与主泥浆线的一部分平行的旁路回路,其将钻井泥浆提供给钻柱。 检测器包括在旁路管路中的一对压力检测端口以及用于检测旁路回路中不同位置处的压力的一个或多个压力传感器,从而可以测量差压。 旁路回路相对于主泥浆供应管线具有小的内部通道,并且可以包括收缩部,以便在通道中产生横截面积不同的两个区域。 在不同横截面积的区域中形成压力传感端口允许压力传感器更精确地检测泥浆脉冲信号。 由于其相对较小的横截面积,只有一小部分钻井泥浆流过旁路回路。 因此,旁路回路可以由液压软管和具有中心通孔的相对小的刚体构成。