公开(公告)号：US20040090863A1

公开(公告)日：2004-05-13

申请号：US10290617

申请日：2002-11-08

申请人： SCHLUMBERGER TECHNOLOGY CORPORATION

发明人： Canyun Wang ,  Jahir Pabon

IPC分类号： G01V001/00

CPC分类号： G01V1/52 ,  G01V1/523 ,  Y10S367/911

摘要： An acoustic logging tool includes external baffle assemblies forming a waveguide structure at the acoustic source. The logging tool is designed for acoustic logging of earth formation surrounding a borehole. The external baffle assemblies form a waveguide structure that is designed to increase signal to noise ratio in an acoustic logging tool using dipole or other acoustic waves. In a preferred embodiment, the acoustic logging tool includes an elongated transmitter module, and a receiver sonde having a linear array of acoustic receivers. The transmitter module includes first and second cylindrical masses spaced apart along the axis by first and second spacers. The first cylindrical mass defines a first circular facing surface and a first cylindrical outer surface. The second cylindrical mass defines a second circular facing surface and a second cylindrical outer surface. A multi-pole acoustic source is fixedly mounted between the first and second circular facing surfaces, and located on the transmitter module axis between the first and second spacers. A first annular baffle assembly surrounding the first cylindrical outer surface has a first annular facing surface co-planar with the first circular facing surface. A second annular baffle assembly surrounding the second cylindrical outer surface has a second annular facing surface co-planar with the second circular facing surface. The annular baffle assemblies form an acoustic waveguide.

摘要翻译： 声学测井工具包括在声源处形成波导结构的外部挡板组件。 测井工具设计用于围绕钻孔的地层的声波测井。 外部挡板组件形成波导结构，其被设计为在使用偶极或其它声波的声学测井工具中增加信噪比。 在优选实施例中，声学测井工具包括细长的发射器模块和具有声学接收器的线性阵列的接收器探头。 发射器模块包括通过第一和第二间隔物沿轴线间隔开的第一和第二圆柱形质量块。 第一圆柱形物质限定第一圆形面对表面和第一圆柱形外表面。 第二圆柱形物质限定第二圆形面对表面和第二圆柱形外表面。 多极声源固定地安装在第一和第二圆形面对表面之间，并且位于第一和第二间隔物之间​​的发射器模块轴上。 围绕第一圆柱形外表面的第一环形挡板组件具有与第一圆形面对表面共面的第一环形面对表面。 围绕第二圆柱形外表面的第二环形挡板组件具有与第二圆形面对表面共面的第二环形面对表面。 环形挡板组件形成声波导。