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Keywords: attenuation
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Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-W
... records the phase shift and attenuation between two receivers and responds differently to the electrical rock properties (resistivity, permittivity and permeability). The characteristics of the amplitude decay and the phase shift can therefore, under given conditions, be used to extract both the...
Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-PPP
... porosity, permeability and acoustic response are also causally related to these scalars (density and atomic number). The purpose of this work is to study the predictive potential of radiographic information quantified by X-Ray attenuation statistical cumulants for some RCAL/SCAL properties. Radiographic...
Proceedings Papers

Paper presented at the SPWLA 58th Annual Logging Symposium, June 17–21, 2017
Paper Number: SPWLA-2017-WWWW
... that make it possible to log in the heaviest and most attenuative mud environments and through thick-walled casings. We have developed a calibration-free ultrasound pulse-echo processing method that capitalizes on self-compensation for mud properties and eliminates the need for separate mud property...
Proceedings Papers

Paper presented at the SPWLA 58th Annual Logging Symposium, June 17–21, 2017
Paper Number: SPWLA-2017-HHH
... Corrosion flowline corrosion materials and corrosion riser corrosion well logging well integrity Pipeline Corrosion natural gas storage perforated interval natural gas storage well cement evaluation attenuation operation integrity information wellbore casing and cementing information...
Proceedings Papers

Paper presented at the SPWLA 57th Annual Logging Symposium, June 25–29, 2016
Paper Number: SPWLA-2016-EEEE
... prohibitive due to operational and/or financial considerations, lithology and mineralogy information may not be available. In the cased-hole environment, the casing and concrete cause attenuation and contribution effects on the spectral gamma rays, which increase the uncertainty in measurements, making cased...
Proceedings Papers

Paper presented at the SPWLA 57th Annual Logging Symposium, June 25–29, 2016
Paper Number: SPWLA-2016-OO
... Abstract A new workflow has been developed for an azimuthal fracture indicator that estimates fracture presence by using measurements of attenuation of dipole acoustic waveforms as a complement to the established Stoneley fracture analysis. The new approach computes normalized differential...
Proceedings Papers

Paper presented at the SPWLA 57th Annual Logging Symposium, June 25–29, 2016
Paper Number: SPWLA-2016-FF
... support or zonal isolation. Typical methods for evaluating cement use attenuation of compressional acoustic waves to derive compressive strength or to compute apparent cement compressional impedance. These measures offer information about the cement, but they have limitations and they may not fully...
Proceedings Papers

Paper presented at the SPWLA 57th Annual Logging Symposium, June 25–29, 2016
Paper Number: SPWLA-2016-MMM
... applications where pressures can reach up to 35,000 psi. Ultrasonic technology has been used for many years for well integrity assurance, but it has been limited to 14- to 16-ppg borehole fluid and 0.2- to 0.75-in. casing thicknesses. The challenge was to overcome highly attenuative borehole fluid as well as...
Proceedings Papers

Paper presented at the SPWLA 56th Annual Logging Symposium, July 18–22, 2015
Paper Number: SPWLA-2015-TT
... determination of key minerals by the measurement of elements in the capture and inelastic spectrum. The challenges of applying this technology in a cased-hole environment included defining relevant corrections for casing and cement gamma ray attenuation effects and their respective contribution effects. This...
Proceedings Papers

Paper presented at the SPWLA 56th Annual Logging Symposium, July 18–22, 2015
Paper Number: SPWLA-2015-VVVV
... azimuthally sectored compensated attenuation measurements for the varying wave types. n this paper, we will first look at the theoretical background, physics, and modeling of these new EMATs as well as the various guided wave modes they can generate. We will then review the additional lab measurements and...
Proceedings Papers

Paper presented at the SPWLA 56th Annual Logging Symposium, July 18–22, 2015
Paper Number: SPWLA-2015-QQQQ
... various "stitched" one-dimensional (1D) sections rather than by a single 1D reduced model. This provides added flexibility in order to approximate complex 3D formations. Second, we introduce the concept of "negative apparent resistivities" in the inversion method. By using the values of attenuation and...
Proceedings Papers

Paper presented at the SPWLA 56th Annual Logging Symposium, July 18–22, 2015
Paper Number: SPWLA-2015-JJ
... & Gas well logging attenuation lose sensitivity spwla 56 apparent permittivity permittivity conductivity resistivity transmitter XXcomponent dielectric permittivity frequency range Symposium anisotropy phase difference sensitivity dielectric anisotropy dielectric tool SPWLA 56 th...
Proceedings Papers

Paper presented at the SPWLA 55th Annual Logging Symposium, May 18–22, 2014
Paper Number: SPWLA-2014-Q
... and a wall thickness of 0.7 in or thicker. To address the task, a pad-based segmented CBL tool can be configured to provide the cement evaluation in these conditions, providing a unique ability to produce a 60-degree attenuation map in casing as large as 24 in OD. To manage the large casing...
Proceedings Papers

Paper presented at the SPWLA 54th Annual Logging Symposium, June 22–26, 2013
Paper Number: SPWLA-2013-SSS
... Abstract Recent advances in cement evaluation technology mean that in addition to the established measurements of amplitude and variable density from sonic measurements and acoustic impedance from ultrasonic measurements, three further measurements are available. These are flexural attenuation...
Proceedings Papers

Paper presented at the SPWLA 53rd Annual Logging Symposium, June 16–20, 2012
Paper Number: SPWLA-2012-202
... ABSTRACT: "Anomalous" LWD propagation resistivity log responses were observed in a high angle well. The anomalous character includes anomalous curve separations, periodic variations with depth, and anticorrelation of the phase and attenuation apparent resistivity curves. In particular, the...
Proceedings Papers

Paper presented at the SPWLA 53rd Annual Logging Symposium, June 16–20, 2012
Paper Number: SPWLA-2012-082
... GGD measurement log analysis attenuation gamma ray GGD neutron Symposium well logging quality control spwla 53 density measurement correction NGD measurement detector borehole schlumberger engineering center axial resolution SPWLA 53 rd Annual Logging Symposium, June 16-20, 2012 1...
Proceedings Papers

Paper presented at the SPWLA 52nd Annual Logging Symposium, May 14–18, 2011
Paper Number: SPWLA-2011-XX
... ABSTRACT: The evaluation of cement placement and zonal isolation in deep water environments is increasingly challenging. Traditional wireline evaluation methods rely on contrasting attenuation rates of sonic or ultrasonic waves to discriminate between cement and fluid behind pipe. In today's...
Proceedings Papers

Paper presented at the SPWLA 51st Annual Logging Symposium, June 19–23, 2010
Paper Number: SPWLA-2010-13229
... dielectric properties of formations began in the late 1970s and showed promise in the ability to distinguish water from hydrocarbons. Upstream Oil & Gas water saturation log analysis attenuation modern microwave formation evaluation sensor evaluation frequency porosity conductivity...
Proceedings Papers

Paper presented at the SPWLA 49th Annual Logging Symposium, May 25–28, 2008
Paper Number: SPWLA-2008-J
... wave slowness and attenuation as a function of frequency, a phenomenon well described by Biot theory. Increased permeability leads to increased dispersion and attenuation. In the method used, wide band Stoneley waveforms were back propagated in the frequency domain with generated dispersion curves. The...
Proceedings Papers

Paper presented at the SPWLA 49th Annual Logging Symposium, May 25–28, 2008
Paper Number: SPWLA-2008-JJJJ
... volume of investigation. log analysis attenuation dielectric assumption frequency dielectric permittivity conductivity Upstream Oil & Gas Propagation Resistivity measurement frequency formation conductivity equation rock dielectric constant separation well logging resistivity...

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