Abstract
An oil shale rubble bed with contrasting permeability regions is investigated using a gas tracer in conjunction with a two-dimensional flow and tracer model and with a one-dimensional dispersion model. Six runs on the retort are discussed. Tracer injections are made into the main flow inlet and into five taps near the top of the retort. Detection taps are located at four levels in the retort with five taps on each level. The one-dimensional dispersion model is fit to the tracer response curves producing estimates of dispersion and space time in the retort. The dispersion model produces reasonable estimates where the fluid flow deviates only slightly from vertical. The two-dimensional flow model developed by Travis at Los Alamos National Laboratory (LANL) is compared to tracer velocities. The correlation between the model and the data is good in the last of the six tests. The correlation is not as good in the earlier tests and possible reasons for this are discussed.
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