... estimation spwla 63 hybrid approach interpretation drilling fluid property drilling fluid formulation permittivity filter cake reservoir characterization artificial intelligence fluid loss control resistivity image fracture resistivity rd annual logging symposium standoff basement...

... examples are given from unconventional online from May 17-20, 2021. wells to demonstrate that the inverted standoff image can reveal fractures when there is insufficient or even no ABSTRACT contrast in medium properties. The inverted standoff image also serves as a diagnostic tool for interpreting A new 2...

... permittivity 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...

... fluids and materials structural geology upstream oil & gas resistivity image oil-based mud july 29 log analysis hydraulic fracturing drilling operation wellbore seismic standoff image standoff permittivity symposium fracture drilling-induced fracture open fracture fractured reservoir...

... 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...

..., 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...

... 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...

... 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...

... 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...

... 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...

... 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 is made of LWD Sigma and resistivity responses...

... 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...

... 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...

... Field placement standoff azimuthal resistivity measurement horizontal well Norway saturation resistivity Symposium resistivity measurement SPWLA 51st Annual Logging Symposium, June 19-23, 2010 1 DETERMINING THE OIL-WATER CONTACT WHILE DRILLING ABOVE THE TRANSITION ZONE IN LONG HORIZONTAL...

... 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...

... 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...

... 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...

... 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...

... for hydrocarbon production. log analysis resolution well logging Upstream Oil & Gas target azimuth sinusoid boundary spwla 49th calculation density depth investigation Symposium standoff relative dip angle borehole density image algorithm azimuth weighting function bed boundary...