Monte Carlo investigation of through-casing (gamma)-(gamma) density logging

摘要

This report documents research I performed, employing Monte Carlo parametric simulations. I investigated the concept of utilizing high-energy (gamma) rays for through-casing density logging. The research exploits the findings of my previously proof-of-concept, the present goal having been to characterize a generic (gamma)-(gamma) tool in various scenarios. In the process, I generated a database of tool-design information. My analysis of the computed results identified a novel design-evaluation technique, a natural extension of my earlier concept to use the formation signal as a quality gauge for the detected signal: Analysis of the formation signal determines, a priori, whether a specific combination of design parameters is, intrinsically, compatible or mismatched. It must be noted that the new technique is only possible in simulations of the present kind. But it is not limited to the set of parameters investigated in the present studies. Hence, any effort to design a prototype tool can benefit significantly from its application. The technique amplifies the power of simulation, which is an inherently cost effective adjunct to ''cutting metal.'' (ERA citation 19:030803)