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Keywords: standoff
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Proceedings Papers

Publisher: Society of Petrophysicists and Well-Log Analysts
Paper presented at the SPWLA 65th Annual Logging Symposium, May 18–22, 2024
Paper Number: SPWLA-2024-0004
... ABSTRACT The Photoelectric Factor (Pe) is a key formation property that helps to identify and distinguish between formations of different lithologies. Pe is only a good measure of the rock matrix properties, as long as standoff and borehole fluids do not overly influence the measurements...
Proceedings Papers

Publisher: Society of Petrophysicists and Well-Log Analysts
Paper presented at the SPWLA 65th Annual Logging Symposium, May 18–22, 2024
Paper Number: SPWLA-2024-0136
... production control wellbore seismic drilling fluids and materials drilling fluid selection and formulation reservoir characterization borehole imaging frequency th annual logging symposium spwla 65 fouda resistivity standoff experiment quantitative estimation algorithm electrode spwla-2024...
Proceedings Papers

Paper presented at the SPWLA 62nd Annual Logging Symposium, May 17–20, 2021
Paper Number: SPWLA-2021-0080
... imager is performed with a 2D axisymmetric finite element code. An efficient forward model is developed by fitting the tool response tables into fourth-order polynomials in terms of the sensor standoff, formation, and mud impedivities for broad ranges of model parameters. The fast forward model based...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5010
... images as well as a standoff image. The results have been provided from both the controlled experiments in the test fixture and from field logs. INTRODUCTION In the late 1960s, the first borehole imaging tool was introduced, which eliminated the necessity for "transparent mud" through the use...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5015
... and dielectric permittivity components constitute the measured signal. The quantitative interpretation uses a sequence of model-based parametric inversion runs to first estimate the mud properties of the log and subsequently invert for the standoff of the microelectrode buttons to the rock surface...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-DD
... log analysis Artificial Intelligence machine learning neural network permittivity mud property Upstream Oil & Gas higher frequency standoff image permittivity image standoff interpretation formation permittivity image dataset well logging frequency spwla 60 inversion...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-T
..., with part of the wave reflected from the formation surface. By analyzing the travel time of the pulse wave from transmitting to the echo being received, the transducer standoff, and therefore borehole radius, can be derived given the fluid sound speed. Analysis of the amplitude of the echo signal enables...
Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-U
... sensors. The new tool is introduced along with the key design features that overcome the challenges associated with LWD imaging in oil-base mud. Sensors are positioned on the rotating drill collar with resulting standoff between the sensors and the formation. For the resistivity image, the tool's...
Proceedings Papers

Paper presented at the SPWLA 58th Annual Logging Symposium, June 17–21, 2017
Paper Number: SPWLA-2017-EEEE
... Upstream Oil & Gas sensitivity neutron porosity apparent porosity neutron migration length flux epithermal Symposium standoff log analysis detector porosity Porosity Tool reaction well logging generator spwla 58 porosity sensitivity am-be source neutron generator source...
Proceedings Papers

Paper presented at the SPWLA 56th Annual Logging Symposium, July 18–22, 2015
Paper Number: SPWLA-2015-UU
... source drives with short transmitter- receiver spacing for maximum formation signal, without interference by tool collar modes. The tool has a high resolution focused pulse echo transducer that fires every 2 ms used to generate ultrasonic standoff and amplitude measurements. It also has two orthogonally...
Proceedings Papers

Paper presented at the SPWLA 55th Annual Logging Symposium, May 18–22, 2014
Paper Number: SPWLA-2014-NN
... and imaginary parts of the impedance. According to the acquired real part impedances, static and dynamic images are generated to provide a clear indication of the formation resistivity distribution around the borehole. In turn, imaginary parts of impedances permit an image of standoffs, which accompanies...
Proceedings Papers

Paper presented at the SPWLA 55th Annual Logging Symposium, May 18–22, 2014
Paper Number: SPWLA-2014-LL
... to first iteratively estimate the mud properties for a small depth section of the log; this estimate is then used to invert for the button standoff and the formation resistivity and permittivity for longer data sections. Besides its ability to produce more accurate formation resistivity, the inversion may...
Proceedings Papers

Paper presented at the SPWLA 54th Annual Logging Symposium, June 22–26, 2013
Paper Number: SPWLA-2013-NNN
... and test-pit data to appraise environmental effects related to diffusion, tool standoff, borehole fluid, and borehole size. To assess the potential of multidetector Sigma logs, we compute radial invasion profiles for a wide range of formations under typical LWD drilling conditions. Finally, a comparison...
Proceedings Papers

Paper presented at the SPWLA 53rd Annual Logging Symposium, June 16–20, 2012
Paper Number: SPWLA-2012-119
... properties of the mud differ significantly from those of bariteweighted mud; consequently standoff-correction schemes designed for barite-weighted systems do not adequately compensate for standoff in formate muds. Third and most important, invasion of the mud has a very large effect on the measured density...
Proceedings Papers

Paper presented at the SPWLA 53rd Annual Logging Symposium, June 16–20, 2012
Paper Number: SPWLA-2012-256
... workflow Symposium curtain-section plane density image inversion well logging inversion-based workflow boundary interpretation reconstruction comp image azimuth final formation model formation model borehole geometry high-angle inversion standoff SPWLA 53 rd Annual Logging Symposium, Jun...
Proceedings Papers

Paper presented at the SPWLA 51st Annual Logging Symposium, June 19–23, 2010
Paper Number: SPWLA-2010-37772
... with a resolution of 0.25 in. over a wide range of standoffs. The paper presents the tool performance during field tests juxtaposed against modeling and laboratory experiment results, and discusses tool specifications and limitations of the technology. It also provides suggestions of various ways in which...
Proceedings Papers

Paper presented at the SPWLA 51st Annual Logging Symposium, June 19–23, 2010
Paper Number: SPWLA-2010-46830
... of the sensor position the sensor characteristics also depend on the sensor itself, the mud, and formation resistivities. Since the signal has to cross the mud gap, the standoff to the borehole wall has some influence especially in boreholes with large rugosity. Numeric simulation methods have greatly improved...
Proceedings Papers

Paper presented at the SPWLA 49th Annual Logging Symposium, May 25–28, 2008
Paper Number: SPWLA-2008-JJJ
... sensitivity to tool standoff. The MSS also incorporates a low-resolution (40 cm) sensor modified from a susceptibility logging sonde developed at the University of Munich. This deep-reading sensor is minimally affected by tool standoff and will provide quality control for readings from the high-resolution...

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