Structures and methods for damping tool waves particularly for acoustic logging tools

• Main Authors: Hsu, Chaur-Jian, Pabon, Jahir A, Joyce, Richard D, D'Angelo, Ralph M, Aron, Jeffrey B, Campanac, Pierre, Reid, Lennox, Straub, H. Charles, Esmersoy, Cengiz, Grigor, Darryl
• Format: Patent
• Language: English
• Published: 04.11.2003

The present invention relates to acoustic logging tools for performing acoustic investigations of subsurface geological formations traversed by a borehole. More particularly, the invention relates to the implementation of particle damping in well logging tools to attenuate tool waves. In one aspect, the invention involves an acoustic logging tool for performing acoustic investigations of subsurface geological formations. In one embodiment, the tool comprises a generally longitudinally extending tool body adapted for positioning in a borehole. At least one transmitter is mounted on the tool body to emit acoustic energy. At least one receiver is also mounted on the tool body at a location axially displaced from the at least one transmitter. The receiver is adapted to receive acoustic energy. An attenuator is also positioned along the body and includes at least one cavity having a plurality of particles disposed therein. The attenuator as disclosed herein may be applied to other logging tools for protecting tool components and enhancing measurement quality. Methods for attenuating acoustic energy transmitted through the body of an acoustic logging tool or other logging tools are also disclosed.