Material-Balance Technique for Analysis of in-Situ Oil-Shale Retorting

摘要

Data essential for the evaluation of in situ oil shale retorts are the amount of shale retorted and the magnitude of various oil degradation mechanisms. These quantities, especially the former, can be difficult to estimate for field experiments. A material balance technique has been developed that can be used with product analyses to determine both shale retorted and oil loss to combustion. The technique relies on a combination of standard concepts of material balance and stoichiometry specific to oil shale retorting. Key parameters within the technique are estimated from laboratory data to allow the approach to be extended to field situations. Application of the technique to recent field results from Geokinetics and Occidental show that the yield from these tests appears to be greater than that previously reported. This is due, in all likelihood, to inadequate accounting of potential liquid product produced in the gas phase. 6 figures, 5 tables. (ERA citation 08:031226)