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1. 发明授权

US6098021A Estimating formation stress using borehole monopole and cross-dipole acoustic measurements: theory and method 有权
标题翻译：使用井眼单极和交叉偶极声测量估算地层应力：理论与方法
公开(公告)号：US6098021A
公开(公告)日：2000-08-01
申请号：US232564
申请日：1999-01-15
申请人： Xiaoming Tang , Ningya Cheng , Arthur C. H. Cheng
发明人： Xiaoming Tang , Ningya Cheng , Arthur C. H. Cheng
IPC分类号： G01V1/50 , G01V1/28
CPC分类号： G01V1/50
摘要： A system and method to determine an in-situ stress field based on borehole acoustic monopole and cross-dipole measurements. A radially polarized monopole shear-wave is generated in a borehole. It is then determined whether the shear-wave has split into two shear-waves. If it has, the difference in velocities between the two split shear-waves is used to determine the stress induced anisotropy around and near the borehole. The difference in velocities of cross-dipole shear-waves and the direction of the fast shear-wave are measured and used to determine the magnitude of the maximum shear stress and the maximum stress orientation of the geologic formation. Furthermore, a method of determining the stress-velocity coupling coefficients from laboratory measurements as well as through field measurement calibration is disclosed. The effect of borehole pressure on the field measurement calibration method of determining the stress-velocity coupling coefficients is taken into account. Additionally disclosed is a method for defining a stress indicator that is related to stress-caused rock deformation. This stress indicator can be used to determine if rock failure is impending and is useful in sand control and borehole stability applications.
摘要翻译：一种基于钻孔声单极和交叉偶极子测量来确定原位应力场的系统和方法。在钻孔中产生径向极化的单极剪切波。然后确定剪切波是否已经分裂成两个剪切波。如果有的话，使用两个分裂剪切波之间的速度差来确定井眼周围和附近的应力诱导各向异性。测量交叉偶极剪切波速度与快速剪切波方向的差异，并用于确定地质构造的最大剪应力和最大应力方向的大小。此外，公开了一种从实验室测量以及通过场测量校准确定应力 - 速度耦合系数的方法。考虑了井眼压力对确定应力 - 速度耦合系数的场测量校准方法的影响。另外公开了一种用于定义与应力引起的岩石变形相关的应力指示器的方法。该应力指示器可用于确定岩石破坏是否即将到来，并且可用于防砂和井眼稳定性应用。

2. 发明授权

US5784333A Method for estimating permeability of earth formations by processing stoneley waves from an acoustic wellbore logging instrument 失效
标题翻译：通过加工来自声井测井仪的石英波来估算地层的渗透率的方法
公开(公告)号：US5784333A
公开(公告)日：1998-07-21
申请号：US861263
申请日：1997-05-21
申请人： Xiaoming Tang , Stephan Gelinsky , Raghu K. Chunduru , Arthur C. H. Cheng
发明人： Xiaoming Tang , Stephan Gelinsky , Raghu K. Chunduru , Arthur C. H. Cheng
IPC分类号： G01V1/50 , G01V1/40 , E21B49/00
CPC分类号： G01V1/50
摘要： A method for determining the permeability of earth formations penetrated by a wellbore from acoustic signals measured by an acoustic wellbore logging instrument. The method includes separating components from the measured acoustic signals which represent Stoneley waves propagating through the earth formations. Signals representing Stoneley waves propagating through the same earth formations are synthesized. The separated acoustic signal components and the synthesized Stoneley wave signals are compared. The permeability is determined from differences between the synthesized Stoneley wave signals and the separated acoustic signal components. In a preferred embodiment, the step of calculating the permeability includes inversion processing a wave center frequency shift and a wave travel time delay with respect to the permeability of the earth formations.
摘要翻译：一种通过声井测井仪测量的声信号来确定井眼渗透的地层的渗透率的方法。该方法包括从表示通过地层形成的斯通利波的测量声信号中分离成分。代表通过相同地层传播的斯通利波的信号被合成。比较分离的声信号分量和合成的斯通利波信号。磁导率由合成的斯通利波斯信号与分离的声信号分量之间的差异确定。在优选实施例中，计算磁导率的步骤包括相对于地层的磁导率的波中心频率偏移和波浪时间延迟的反演处理。

3. 发明授权

US07392135B2 Adaptive equalization of downhole acoustic receivers 有权
标题翻译：井下声学接收机的自适应均衡
公开(公告)号：US07392135B2
公开(公告)日：2008-06-24
申请号：US11323674
申请日：2005-12-30
申请人： Georgios L. Varsamis , Joakim Oscar Blanch , Arthur C. H. Cheng , Calvin Wisner Kessler , Denis Schmitt , Batakrishna Mandal
发明人： Georgios L. Varsamis , Joakim Oscar Blanch , Arthur C. H. Cheng , Calvin Wisner Kessler , Denis Schmitt , Batakrishna Mandal
IPC分类号： G01R29/00
CPC分类号： G01V1/44
摘要： Methods and apparatus are provided for reducing and/or substantially eliminating sensitivity mismatch of acoustic receivers used with acoustic sources to determine acoustic properties of geologic formations as a logging tool traverses the formations. Methods are directed to detecting waveform arrival times at receivers, determining places in a well where arrival times of waves are substantially the same at a plurality of receivers, and estimating effective receiver sensitivities and equalization factors using Stoneley wave amplitudes and windowed deconvolution of Stoneley waves. Methods are further directed to correcting wave amplitudes using estimated effective receiver sensitivities and equalization factors for receivers.
摘要翻译：提供了用于减少和/或基本上消除与声源一起使用的声接收机的灵敏度失配的方法和装置，以便在测井工具穿过地层时确定地质构造的声学特性。方法涉及检测接收器处的波形到达时间，确定在多个接收机中波的到达时间基本相同的阱中的位置，以及使用斯通利波斯的斯通利波幅度和窗口去卷积来估计有效的接收机灵敏度和均衡因子。方法还涉及使用估计的有效接收机灵敏度和接收机的均衡因子校正波幅度。

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