Acoustic characterization of encapsulated bubbles at sonic frequencies and elevated temperatures and pressures
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The acoustic effects of introducing small quantities of a highly compliant material into a much less compressible system are well understood. However for applications in geological formations, additional requirements regarding the size and robustness of the particles can present challenges. Additionally, the elevated pressures commonly encountered in downhole situations can cause a significant decrease in the level of contrast provided. To address this, resonance tube experiments were carried out in an attempt to identify suitable particles for this application. Physical parameters for the ideal particle are given, and the potential problem of acoustic attenuation in the rock formation is addressed.