Application of a Novel Through Casing Acoustic Imaging Technique to Identify Gas Migration Paths in a Salt Body

Bradley, Thomas; Tang, X.M.; Patterson, Doug; Schaaf, Jeanne

doi:10.3997/2214-4609.201400788

Cited by 2 publications

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“…Single-well shear-wave reflection survey using a dipole acoustic system in a borehole has emerged as an effective technology to image geologic structures away from borehole (e.g., Tang and Patterson, 2009;Bradley et al, 2011;Wei and Tang, 2012). Simulation of the waveform data from the reflection survey is important for analyzing the effects such as formation elastic property variation, borehole modulation, frequency, and source/receiver orientation, etc.…”

Section: Introductionmentioning

confidence: 99%

Shear-wave radiation, reception, and reciprocity of a borehole dipole source: With application to modeling of shear-wave reflection survey

2014

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The development of dipole shear-wave imaging technology requires understanding of the effects of radiation, reflection, and reception of elastic waves from a borehole dipole source, for which we provide a comprehensive analysis. We first show that the radiation of the dipole source can be accurately computed using its far-field asymptotic solution when the radiation distance is greater than wavelength. We then demonstrate the reciprocity relationship between shear-wave radiation and reception of the dipole source. Consequently, the borehole radiation pattern can be used to compute the borehole reception directivity. The use of the reciprocity relationship and the asymptotic solution greatly facilitates the modeling of the wavefield for the borehole shear-wave reflection survey. The modeling results agree well with those from a 3D finite-difference elastic wave simulation. The modeling of SH-and SV-wave radiation/reception of the dipole source also demonstrates that the SH-wave component is far greater than the SV-wave component, providing an important foundation for shearwave reflection data processing and interpretation.

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Section: Introductionmentioning

confidence: 99%

Shear-wave radiation, reception, and reciprocity of a borehole dipole source: With application to modeling of shear-wave reflection survey

2014

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Acoustic radiation and reflection of a logging-while-drilling dipole source

Wei

Tang

Cao³

2019

Geophysical Journal International

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SUMMARY With the comparison to the resistivity ultra-deep measurement, the single-well reflection survey in acoustic logging-while-drilling (ALWD) measurement lags far behind, especially ALWD dipole measurement has long been thought to be little added value. In this paper, we extended the dipole shear-wave (S-wave) reflection survey technology in wireline logging into ALWD and demonstrated the theoretical feasibility of adopting a dipole source–receiver system to perform ALWD reflection survey. For this purpose, we investigated the radiation patterns of radiantSH, SV and P waves, the energy fluxes of guided and radiant waves and their acoustical radiation efficiencies from an LWD dipole acoustic source by comparisons with the wireline results. The analysis results reveal that a dominant excitation-frequency band does exist in ALWD dipole S-wave reflection. Consequently, the expected excitation frequency should be located in the band of the signal with high radiation efficiency, guaranteeing the best radiation performance. In fast formations, SH wave is the best candidate for ALWD reflection survey due to its highest radiation efficiency. In contrast, the dominant excitation-frequency band of SH wave gets wider in a slow formation. Besides, the SV- and P-wave radiation efficiencies are also remarkable, implying that both waves can also be used for ALWD reflection survey in slow formations. We expounded the SH-, SV- and P-reflection behaviours at three typical excitation frequencies by our 3-D finite difference. Simulations to single-well reflection validate the key role of dominant excitation-frequency band and demonstrate the theoretical feasibility of applying the technology to ALWD. Our results can guide the design and measurement methods of ALWD dipole S-wave reflection survey tool, which could have extensive application prospect for geo-steering.

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Application of a Novel Through Casing Acoustic Imaging Technique to Identify Gas Migration Paths in a Salt Body

Cited by 2 publications

References 0 publications

Shear-wave radiation, reception, and reciprocity of a borehole dipole source: With application to modeling of shear-wave reflection survey

Shear-wave radiation, reception, and reciprocity of a borehole dipole source: With application to modeling of shear-wave reflection survey

Acoustic radiation and reflection of a logging-while-drilling dipole source

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