... calibration gamma ray LWD tool tool design spectrum response discrepancy geometry count rate correction Introduction The NGR measurement is the simplest and most frequently used nuclear measurement in well logging. Typically, this type of logging tool has a single GR detector...

... correction log analysis borehole size reference borehole size gr value characterization count rate borehole correction factor LWD tool correction algorithm reference borehole society of petroleum engineers lwd gr tool Introduction Natural gamma-ray logging has been around for many years...

... hydraulic fracturing axial extent well logging Completion Installation and Operations Upstream Oil & Gas count rate signal fracture height log analysis proppant detector fracturing fluid modeling nrt signal proppant placement borehole axis fracture plane horizontal well wellbore depth...

.... The tagged pack material is indicated from: (1) changes in after-pack PNC detector count rates relative to corresponding before-pack count rates, (2) increases in PNC formation and borehole component capture cross-sections (Σ fm and Σ bh ), and/or (3) increases in the computed elemental yield of the neutron...

... and outwards within the wellbore. The density and neutron nuclear sensors allow grouping of detector count rate ratios in data clusters which have been interpreted to be responding to annulus materials spanning from cement, heavier liquids, settled mud solids, lighter liquids, and gas. Neutron responses...

... saturation pulsed neutron instrument count rate wellbore Introduction Oxygen activation is a physical phenomenon that is relatively well known in the nuclear logging circles due to its implementation in water flow rate measurements in the wellbores. A high-energy neutron interacts with O-16...

.... At the same time the importance of reliable fracture diagnostics for optimization of hydraulic fracturing both from a well performance and cost control standpoint remains extremely important. log analysis upstream oil & gas concentration detector count rate artificial intelligence modeling...

.... The successful application of the method is shown in several log examples. well logging accuracy borehole porosity detector calibration shale sngd log analysis attenuation neutron-gamma density neutron axial resolution correction spe 159334 caliper count rate upstream oil & gas sngd...

... neutron absorption by the compound reduces count rates in the near and far detectors, with approximately the same percentage reduction observed in each detector, leaving the N/F ratio unchanged. One detection method utilizes a comparison of before-frac log count rates and after-frac count rates...

... gamma-ray energy to what can be described as a virtual source, for which the detector measures formation density by way of absorbed count rates. 1 Titman has interpreted this as a diffusion process where the logarithm of the count rate is inversely proportional to formation density. 2...

... modeling. The Monte Carlo is benchmarked against the experimental results and then used to extend the range of investigation. From this work, we are able to determine the variability of the following as a function of detector design: Dark Current (the count rate in a clean formation) Calibrator API...

... porosity count rate density index pnc tool society of petroleum engineers borehole size ch density index rinc dependency detector well logging log analysis density effect upstream oil & gas modeling correction technique borehole configuration density measurement capture...

... listed above will be presented. Issues associated with non-zero mean cyclic noise such as is the case for log measurements made in spiral bore holes and its impact will be addressed. neutron count rate frequency count rate fourier coefficient correction power spectrum coefficient data...

... compensation of the density measurement is achieved using a new technique called "Self Binning". This technique relies on measurements made by the density tool itself to correct for tool standoff. The count rate of the near detector is sampled at a very high rate and combined in such a way as to divide...

... detector array is described for improved density response. atom density count rate machine learning contribution porosity formation density neural network fast neutron detector gamma spe 71742 odom detector array well logging fast neutron upstream oil & gas log analysis inelastic...

.... Gas cap monitoring in very low porosity reservoirs in Colombia proved to be not only feasible, but extremely profitable by differentiating dry gas zones from low GOR zones. colombia count rate reservoir log analysis intervention porosity crossover ap monitor log drillstem/well testing...

...- and cased-hole logs, and these afford a chance to compare changes indensity with changes in neutron porosities. Examplecomparison are presented and limitations discussed. spe 56647 upstream oil & gas neutron log analysis crin trace density measurement count rate thermal neutron neutron log...

... velocity is determined by two methods: Use of a count-rate ratio from the two spectral gamma detectors, which provides a continuous log but requires well-calibrated detectors. Use of an impulse/shutdown sequence, which is performed while the tool is stationary and which is calibration independent...

... primarily by four variables: formation density, casing thickness, cement thickness, and cement density. Analysis of measured gamma-ray spectra indicated that the spectral shape contains little information about the variables that is not contained in the total count rate. Therefore, four detectors...

... a wide range of cased-hole conditions validate empirical relationships between detector count rates and gas holdup for various casing diameters. The sensitivity of the measurement to other factors, such as pressure, salinity, and fluid type, are also investigated. The new production logging method may...