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    • 8. 发明申请
    • Digital pressure derivative method and program storage device
    • 数字压力微分方法和程序存储装置
    • US20040133350A1
    • 2004-07-08
    • US10411579
    • 2003-04-10
    • Schlumberger Technology Corporation
    • Anthony VenerusoJeff Spath
    • G01V001/40
    • G06F17/10E21B49/008G01V1/36G01V2210/32H03H17/06
    • In a Digital Pressure Derivative Technique (DPDT) which uses convolution, an input signal including noise is convolved with a wavelet to produce an output signal which is a derivative of the input signal and which is substantially devoid of the noise. The DPDT can be used in many applications; however, in one such application, a pressure signal from a wellbore including noise is convolved with a special wavelet to produce an output signal which is the derivative of the input pressure signal, the output signal being substantially devoid of the noise. The wavelet is made from the unit sample response of a bandlimited, optimum linear phase Finite Impulse Response digital differentiator. The DPDT technique enables analysts to customize the differentiation based on the quality of the measured data without having to use traditional, subjective smoothing algorithms. The results presented here, in connection with the one such application mentioned above, bring significant improvements to the diagnosis and interpretation of pressure transient data, and interpretation techniques that utilize higher-order derivatives are now practical.
    • 在使用卷积的数字压力微分技术(DPDT)中,包括噪声的输入信号与小波卷积以产生作为输入信号的导数并且基本上没有噪声的输出信号。 DPDT可用于许多应用; 然而,在一个这样的应用中,来自包括噪声的井眼的压力信号与专用小波卷积以产生作为输入压力信号的导数的输出信号,输出信号基本上没有噪声。 小波由带通,最佳线性相位有限脉冲响应数字微分器的单位样本响应构成。 DPDT技术使分析师能够根据测量数据的质量定制差异化,而不必使用传统的主观平滑算法。 这里提出的结果与上述一个这样的应用相比,对压力瞬态数据的诊断和解释带来了显着的改进,而现在使用高阶导数的解释技术是实用的。
    • 9. 发明申请
    • Acoustic isolator for downhole applications
    • 用于井下应用的隔声器
    • US20040104068A1
    • 2004-06-03
    • US10610940
    • 2003-07-01
    • Baker Hughes Incorporated
    • Sergey EgerevVladimir BelovVladimir DubinskyAlexei BolshakovVictor TiutekinVictor Yushin
    • G01V001/40
    • G01V1/523
    • A plurality of heavy mass irregularities attached to an inner wall of the drill collar attenuate waves traveling through the collar. The plurality of heavy mass irregularities are spaced and sized for the maximum attenuation of acoustic pulses in a predetermined frequency range. The mass irregularities may be rings secured to the inner surface of the collar by neck pieces, extending outwardly from the outer circumference of the ring. The mass irregularities may be made of steel or tungsten and are between six and ten in number. The spacing of the irregularities may lie between twelve and fourteen centimeters. A center pipe may be included to isolate the irregularities from the fluid flow associated with the drilling operation. The pipe may be of a soft material such as rubber to reduce transfer of acoustic noise along the drill string. The irregularities may be in an oil based fluid with the pipe fitting closely in the center of the rings. In another embodiment of the invention, each of the mass irregularities is attached to the drill collar over substantially the entire length of the mass irregularity, enabling the attenuation of high frequencies. In yet another embodiment of the invention, the attenuator comprises a substantially cylindrical body with a plurality of recesses on the inside and/or outside of the cylindrica body, with the length of the recesses selected to provide attenuation within a specified band. In another embodiment of the invention, the attenuator comprises a plurality of sections each having an inner diameter and an outer diameter, each section acting like a waveguide with an associated passband and reject-band.
    • 附接到钻铤的内壁的多个重质量不规则物减弱了穿过套环的波浪。 多个重质量不规则部分被间隔开并确定尺寸,用于预定频率范围内的声脉冲的最大衰减。 质量凹凸可以是通过颈部从环的外圆周向外延伸的固定到套环内表面的环。 质量不匀度可以由钢或钨制成,数量在六到十之间。 不规则的间距可以在十二到十四厘米之间。 可以包括中心管以将不规则物与与钻井操作相关联的流体流动隔离。 管道可以是诸如橡胶的软材料,以减少沿着钻柱的声学噪声传递。 不规则形状可以在油基流体中,管道紧密配合在环的中心。 在本发明的另一个实施例中,每个质量不规则物在质量不规则的基本上整个长度上附接到钻铤,使得能够衰减高频。 在本发明的另一个实施例中,衰减器包括在圆柱体的内部和/或外部具有多个凹槽的基本上圆柱形的主体,其中凹部的长度被选择以在特定的带内提供衰减。 在本发明的另一个实施例中,衰减器包括多个部分,每个部分具有内径和外径,每个部分的作用类似于具有相关联的通带和拒绝带的波导。