... physical metallic particles can cause a huge dielectric effect approach to calculate dielectric constant and resistivity (Wong, 1979; Misra, 2015). Efforts have been taken to directly from phase shift and attenuation logs without explore potential applications of dielectric constant in resorting...

... and receiver antenna operates as a magnetic dipole with polarization along the borehole longitudinal axis. The instrument provides borehole-compensated propagation wave attenuation and phase difference measurements at five discrete frequencies at multiple depths of investigation (up to 8 inch). The instrument...

... is to study the predictive potential of radiographic information quantified by X-Ray attenuation statistical cumulants for some RCAL/SCAL properties. Radiographic screening can be performed in seconds per sample providing a cost/time efficient method to obtain sample data. 15 samples were chosen from a well...

... 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...

... 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...

... 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-hole spectroscopy analysis extremely challenging...

... 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 energies (NDE's) for the oriented dipole for subsequent integration with the traditional Stoneley...

..., cement properties and their changes can differ greatly from the standard simulated lab sample measurements. In severe cases, the cement may not set and develop the required strength, resulting in no structural support or zonal isolation. Typical methods for evaluating cement use attenuation...

... 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...

... in the 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...

... 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 test well...

... "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 phase...

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... 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 requirements...

... impedance from ultrasonic measurements, three further measurements are available. These are flexural attenuation, amplitude and velocity from the third interface echo. The availability of six independent measurements can increase one s confidence in the evaluation interpretation. In addition...

... is not a point source, but rather an extended source as shown in Figure 2. Fig. 2 Using the attenuation of neutron-induced gamma rays to measure the electron density of the formation. Neutrons coming from the neutron generator produce gamma rays from materials all around the tool, with most originating...

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... 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 deepwater environment, heavy...

... In summary, equations 1 and 3 show that an EM wave propagating through a material will be attenuated and experience a phase shift. At 1 GHz, the amount of attenuation and phase shift are functions of intrinsic properties of the material, including its dielectric constant, conductivity, and dielectric...

... 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...