Advanced Compressional and Shear Slowness Sonic Acquisition in Cased Wells.

Murray, Doug; Li, Yan Hua; Voskamp, Arne; Qiang, Liu Guo

doi:10.1190/segj092009-001.38

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“…This issue is caused by the strong interference of casing waves in the useful formation waves, especially when the formation and casing are poorly bonded [ 13 ]. In signal processing, corresponding techniques have been developed after the signal is collected to eliminate the casing waves and understand acoustic formation properties [ 18 , 19 , 20 , 21 ]. However, a foundation for signal processing techniques is that the collected data have an adequate signal-to-noise ratio to extract the formation information [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Design of an Acoustic Through-Casing Logging Tool

Zhang

et al. 2022

Sensors

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Well logging is performed in oil and gas exploration wells to obtain the physical characteristics of underground formations. Thereafter, these wells are cased. Through-casing logging is important in mature fields and for wells that are cased without logging due to borehole stability issues. Acoustic through-casing logging is a challenging issue due to the strong interference of casing waves in formation waves, especially when the casing and formation are poorly bonded. An acoustic tool with dual-source transmitters is developed, in which an additional transducer is added to suppress casing waves. First, the operation principle and the overall design of the tool are carried out, including the span distance between the two transmitting transducers and the spacing distance between the transmitting transducer and the receiving transducers. Thereafter, a dual-source transmitting circuit is designed to send out two excitation signals of opposite polarities. These signals possess good consistency, high emission power, and precise signal adjustment. Lastly, the tool is tested in cased exploration wells in China. The experiment endings show that about 90% of the casing waves are canceled. By suppressing the casing wave amplitude, the cased-hole acoustic logging can be used commercially to obtain trustworthy formation information.

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Section: Introductionmentioning

confidence: 99%

Design of an Acoustic Through-Casing Logging Tool

Zhang

et al. 2022

Sensors

View full text Add to dashboard Cite

show abstract

Advanced Compressional and Shear Slowness Sonic Acquisition in Cased Wells.

Cited by 1 publication

References 1 publication

Design of an Acoustic Through-Casing Logging Tool

Design of an Acoustic Through-Casing Logging Tool

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