..., this technology provides the capability to evaluate the tubing eccentricity inside the casing. Through-tubing casing inspection presents challenges in mainly two areas, the first is the tubing shielding effect. On average, only 20% of the magnetic flux density reaches the casing area behind the tubing. Secondly...

... the presence of tool or borehole. We assume a sphere with the source at its center. The formation is of SiO2 with matrix density of 2.65 g/cc. We vary the liquid-filled porosity and compute the neutron flux at radially outward cells. Figure 3 displays the near/far (N/F) ratio of the total flux. 0 100 200 300...

... well logging variation flux cs-137 source Upstream Oil & Gas sensitivity density sensitivity correction detector spwla 55 Badruzzaman interpretation log analysis cell 9 Bremsstrahlung source Symposium photon flux hydrogen spectra neutron source inelastic photon photon...

... Upstream Oil & Gas spwla 48 variation flux log analysis Monte Carlo simulation calculation porosity detector Simulation neutron fsf nuclear measurement well logging Symposium equation density measurement FSF approximation radial direction rapid simulation particle flux...

... code, and utilised the predicted fluxes at the detector locations to train a set of neural networks. The deterministic code is based on the multi-group energy approximation, and solves the Boltzman transport equation for neutral particles using a variational discretisation procedure based on the even...

... atomic ion yields, higher avenge current capabilities and longer life. It is expected that 4.3 cm-diameter logging tools incorporating HINS systems (including source, power supplies and controls) will be capable of generating average neutron output fluxes of >109/sec at -14 MeV or >?107/sec at -2.5...

... the contribution of trace absorbers. Upstream Oil & Gas calculation absorption cross-section experiment well logging Transputer correlation borehole Artificial Intelligence accuracy carlo calculation mdel log analysis flux correction cross-section important advantage detector...

... by a factor of 3 from the value for clean sand. Improvements in the technique are now being studied which will increase the accuracy to about 1% or 2%. log analysis mrth high degree Reservoir Characterization Upstream Oil & Gas reactor sanple flux structural geology accuracy establishment...

... well logging particle porosity Porosity Tool computer detector borehole Monte Carlo flux log analysis approximation neutron Computation energy group Upstream Oil & Gas sensitivity statistical error geometry Symposium log interpretation spectra detector response...

... well logging phenomenological model Upstream Oil & Gas mud cake fitting detector assembly log analysis detector flux physics interaction aluminum block photon spectrum geometry detector assembly detector assembly Austin Chalk photoelectric cross section Symposium spectra...

.... well logging schlumberger-doll research neutron absorber Symposium detector calibration flux Wellsite Measurement capture cross-section absorber Upstream Oil & Gas engineering physics department Schlumberger Well Service interpretation resistivity log analysis thermal neutron...

... to calculate the uncollided steady-state 4.43 and 6.09 MeV gamma flux received by a detector immersed in an infinite reservoir together with a 14 MeV neutron source. These data have been combined with moments methods data and the magnitude of the interference problem determined. Analysis of data presented...