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    • 4. 发明申请
    • HIGHLY INTEGRATED LOGGING TOOL
    • 高度集成的记录工具
    • US20060290354A1
    • 2006-12-28
    • US11160490
    • 2005-06-27
    • Mark FredetteMartin Poitzsch
    • Mark FredetteMartin Poitzsch
    • G01V3/00G01V3/02G01V3/04
    • G01V11/005G01V3/24
    • An apparatus for logging a formation traversed by a borehole includes a plurality of logging tools adapted for conveyance inside the borehole. The plurality of logging tools includes a tool body, a sensing pad responsive to a density property of the formation coupled to the tool body, a current emitting measure electrode responsive to a lateral resistivity property of the formation incorporated on the sensing pad, a mechanism for urging the sensing pad in contact with a side of the borehole coupled to the tool body, and a pair of mass isolation bands disposed about the tool body to isolate a mass of the tool body adjacent the measure electrode.
    • 用于记录由钻孔穿过的地层的装置包括适于在钻孔内传送的多个测井工具。 所述多个测井工具包括工具主体,响应于耦合到工具主体的地层的密度特性的感测板,响应于结合在感测板上的地层的横向电阻特性的电流发射测量电极,用于 推动感测垫与耦合到工具主体的钻孔的一侧接触;以及一对质量隔离带,其设置在工具主体周围,以隔离与测量电极相邻的工具体的质量。
    • 6. 发明授权
    • Data compression method for use in wellbore and formation characterization
    • 用于井筒和地层特征的数据压缩方法
    • US06405136B1
    • 2002-06-11
    • US09602860
    • 2000-06-23
    • Qiming LiJohn LovellMark Fredette
    • Qiming LiJohn LovellMark Fredette
    • G01V318
    • E21B47/04H03M7/30
    • A method is disclosed for compressing a frame of data representing parameter values, a time at which each parameter value was recorded, and an orientation of a sensor at the time each parameter value was recorded. Generally the method includes performing a two-dimensional transform on the data in the orientation domain and in a domain related to the recording time. In one embodiment, the method includes calculating a logarithm of each parameter value. In one embodiment, the 2-D transform includes generating a Fourier transform of the logarithm of the parameter values in the azimuthal domain, generating a discrete cosine transform of the transform coefficients in the time domain. This embodiment includes quantizing the coefficients of the Fourier transform and the discrete cosine transform. One embodiment of the method is adapted to transmit resistivity measurements made by an LWD instrument in pressure modulation telemetry so that while-drilling images of a wellbore can be generated. The one embodiment includes encoding the quantized coefficients, error encoding the encoded coefficients, and applying the error encoded coefficients to the pressure modulation telemetry.
    • 公开了一种用于压缩表示参数值的数据帧,记录每个参数值的时间以及在记录每个参数值时传感器的方位的方法。 通常,该方法包括对取向域中的数据和与记录时间有关的域中的数据执行二维变换。 在一个实施例中,该方法包括计算每个参数值的对数。 在一个实施例中,2-D变换包括在方位域中产生参数值的对数的傅里叶变换,产生时域中的变换系数的离散余弦变换。 该实施例包括量化傅立叶变换和离散余弦变换的系数。 该方法的一个实施例适用于在压力调制遥测中传输由LWD仪器进行的电阻率测量,从而可以产生钻井图像。 一个实施例包括对量化系数进行编码,对编码系数进行差错编码,以及将误差编码系数应用于压力调制遥测。