| 摘要 |
Methods and apparatus for performing sonic well logging within a wellbore based on optical Distributed Acoustic Sensing (DAS) are provided. A sonic well logging system based on DAS may be capable of producing the functional equivalent of tens, hundreds, or even thousands of acoustic sensors. In this manner, the emplacement of the sonic well logging system based on DAS may not be nearly as complex or expensive as emplacing a sonic well logging system based on traditional methods. Furthermore, multiplexing may be simpler, downhole electronics need not be used, and the sonic well logging system may be used in extreme, high temperature environments. |
| 主权项 |
1. An apparatus for performing sonic well logging in a wellbore, comprising:
an acoustic energy source disposed between a casing disposed in the wellbore and a tubing disposed in the casing, wherein the acoustic energy source is configured to generate acoustic signals in the wellbore for interacting with at least one of the wellbore, a wellbore completion, and formations adjacent the wellbore to form transmitted, reflected, refracted, or absorbed acoustic signals; and an optical waveguide for distributed acoustic sensing (DAS) disposed in the wellbore, wherein the transmitted, reflected, or refracted acoustic signals affect light propagating in the waveguide. |
