... high-resolution borehole images in both water-based and oil-based muds for fracture and fault detection, stress orientation, formation dip, and borehole stability applications. The ultrasonic imager also provides high-resolution caliper data. Azimuthally oriented compressional and shear slowness...

... ABSTRACT In slow formation borehole acoustic Wireline Logging (WL) and Logging While Drilling (LWD) it is common to obtain formation shear slowness from the dispersive borehole guided flexural and quadrupole wave, respectively. Due to poor signal to noise ratio (predominantly LWD) and/or tool...

... government europe government production control slowness spwla 64 fracture imaging stratigraphy fracture spwla-2023-0063 workflow reservoir boundary imaging geological subdiscipline boundary hornby production monitoring reservoir characterization th annual logging symposium sonic imaging...

... Abstract Measuring the changes in the formation acoustic slowness over the life of a well can give valuable insight into changes in formation properties with time. However, once a well has been cased and completed, measuring formation slowness with conventional open hole acoustic tools can...

... dispersion curve slowness drilling noise rd annual logging symposium spwla 63 quadrupole mode receiver array SPWLA 63rd Annual Logging Symposium, June 10-15, 2022 DOI: 10.30632/SPWLA-2022-0033 SOURCELESS LWD BOREHOLE ACOUSTICS: FIELD TESTING THE CONCEPT Alexei Bolshakov, Kris Walker, Andee Marksamer...

... Abstract A new logging-while-drilling (LWD) dual ultrasonic tool enables the measurement of high-resolution, full-azimuth, ultrasonic pitch-catch compressional and shear (P&S) slownesses, in addition to high-definition pulse-echo images (Blyth et al. 2020). The tool provides a unique...

... as well as the mud slowness. The inversion algorithm was validated by experimental measurements where a tool was immersed in drilling mud and the transit-time data were extracted using a peak detection method applied to the received ultrasonic waveforms. The inversion showed that the computed caliper...

..., layering), extrinsic (stress), and borehole effects that may affect the basic measurements of compressional and shear slownesses. Any advanced interpretation of sonic data has historically been done days to weeks after the acquisition, and the value of the measurement can be diminished due to the time...

... well logging frequency neural network model log analysis upstream oil & gas dispersion data machine learning neural network spwla 62 artificial intelligence mode-search solver mud slowness dispersion curve slowness nd annual logging symposium spwla-2021-0059 flexural...

... the signal-to-noise ratio (SNR) of leak signals. Ge et al. (2020) invented a method to remove guided-wave noise (including road-noise and other noise propagating along the wellbore from surface or downhole equipment) and simultaneously measure guided-wave propagation direction, amplitude, and slowness...

... resolutions to form clusters, which are Analysts (SPWLA) and the submitting authors. then tracked by the connecting with its neighboring This paper was prepared for the SPWLA 62nd Annual Logging Symposium held depths. As different resolution slownesses are physically online from May 17-20, 2021. constrained...

... surveillance reservoir simulation upstream oil & gas density image june 24 case study spwla 61 nmr porosity reflector symposium doublet azimuthal density geothermal project july 29 slowness wellbore permeability SPWLA 61st Annual Logging Symposium, June 24 to July 29, 2020 1 DELINEATING...

..., poor data quality, and formation heterogeneity. For example, in some extreme cases, such as a formation with strong heterogeneity, multimode methods may yield erroneous ghost modes or discontinuous dispersion curves for each mode. Borehole modes with different slowness have different arrival times...

...ABSTRACT ABSTRACT Flexural-dipole sonic logging has been widely used as the primary method to measure formation shear slowness because it can be applied in both fast and slow formations and can resolve azimuthal anisotropy. The flexuraldipole waveforms are dispersive borehole-guided waves...

... centralization, prevents rotation of the formation imager, and reduces stick/slip motion, which is essential for obtaining high-resolution data. Centralization of the array sonic tool is critical for data quality, irrespective of whether the requirement is simply sonic slownesses or involves more complex dipole...

... upstream oil & gas flexural wave borehole dispersion curve log analysis daa log dispersion asymptotic analysis july 29 stoneley wave formation slowness well logging dipole wave coherence application asymptotic index reservoir characterization frequency slowness curve shear...

...ABSTRACT ABSTRACT A new logging while drilling (LWD) acoustic tool has been developed with novel ultrasonic pitch-catch and pulse-echo technologies. The tool enables both highresolution slowness and reflectivity images, which cannot be addressed with conventional acoustic logging. Measuring...

... horizontal poisson well logging constraint july 29 reservoir characterization directional drilling static moduli coefficient stiffness coefficient slowness maximum horizontal stress symposium horizontal young log analysis upstream oil & gas horizontal stress minimum horizontal stress...

... a correct interpretation is possible. A sonic tool used in horizontals needs to be stiffer and shorter than a regular sonic tool and should be able to fire and acquire both monopole (for compressional slowness) and four component cross-dipole (for fast and slow shear slowness) modes. Cased-hole monopole...

... by the Society of Petrophysicists and Well Log Analysts (SPWLA) and the submitting authors. This paper was prepared for presentation at the SPWLA 60th Annual Logging Symposium held in The Woodlands, TX, USA June 17-19, 2019. ABSTRACT Dipole sonic logging can estimate formation shear slowness in all formations...