Numerical Modeling of a True in Situ Oil Shale Retort.

摘要

A numerical model has been developed to simulate the true in situ retorting process. The retort is assumed to be a low-porosity fractured bed composed of large seams of competent shale separated at intervals by open fractures. Kerogen and carbonate decomposition and char,oil,and gas combustion,as well as other reactions,are considered. In contrast to the results of rubbled-bed models,the retorting of seams thicker than one meter is characterized by incomplete retorting and significant oil combustion (10to 40% of that retorted). The amount of shale retorted can,however,be maximized by proper control of air and steam injection rates,with the injected gas being optimally 40to 50% steam. The oil available for recovery from a two meter seam can then be,for example,as high as 50% of Fischer Assay. (ERA citation 04:021607)