... 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...

... wellbore seismic drilling fluids and materials drilling fluid selection and formulation reservoir characterization electrode standoff experiment production monitoring frequency th annual logging symposium spwla 65 borehole imaging drilling fluid property log analysis spwla-2024-0136 barrett...

... permittivity filter cake reservoir characterization artificial intelligence fluid loss control resistivity image basement permittivity image standoff machine learning well logging drilling fluids and materials spwla-2022-0102 spwla 63 interpretation fracture resistivity rd annual logging...

... 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...

... 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...

... 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...

... ABSTRACT The new-generation oil-base mud (OBM) microresistivity imagers provide photorealistic high-resolution quantified formation imaging. One of the existing interpretation methods is based on composite processing providing an apparent resistivity image largely free of the standoff effect...

... enabling the same high level of formation evaluation. resolution borehole Upstream Oil & Gas amplitude acoustic impedance image spwla 60 log analysis 5-ppg obm caliper measurement impedance image well logging Limestone Formation standoff caliper ppg 0 fracture transducer...

... 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...

... constructed. Sensitivity to formation conditions such as low porosity and presence of thermal absorbers, and operational conditions, such as tool standoff are examined. The state of neutron generator technology is also discussed in terms of neutron yield, target properties, power demands, etc., which would...

... compressional waveform mechanical property horizontal well unipole drilling sonic measurement standoff anisotropy SPWLA 56th Annual Logging Symposium, July 18-22, 2015 ENHANCING SHALE RESERVOIR COMPLETION DESIGN USING ORIENTED UNIPOLE LOGGING WHILE DRILLING SONIC MEASUREMENTS IN HORIZONTAL WELL...

... 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...

... the inversion, we use a sequence of inversion runs 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. Upstream Oil & Gas spwla 55...

... 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...

... 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...

... reconstruction curtain-section plane density image inversion comp image azimuth well logging inversion-based workflow log analysis boundary final formation model trajectory formation model workflow borehole geometry Symposium high-angle inversion standoff SPWLA 53rd Annual Logging Symposium...

... 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 and accelerated over the last decade and are now used to optimize sensor geometry. Qualification...

... Symposium Directional Drilling calculation horizontal well resistivity measurement detection Troll Field placement resistivity standoff SPWLA 51st Annual Logging Symposium, June 19-23, 2010 DETERMINING THE OIL-WATER CONTACT WHILE DRILLING ABOVE THE TRANSITION ZONE IN LONG HORIZONTAL WELLS...

... 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...

... and count rates over the Compton window. Tool response was further characterized in the form of a spine-and-ribs plot using modeled data covering a wide range of environmental parameters including standoff, mud weight, and formation bulk density. Results show that density calibration functions are strongly...