E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/2, 166/35
E21B 43/24 (2006.01) E21B 43/16 (2006.01) E21B 43/247 (2006.01)
Patent
CA 1114284
1. BE IT KNOWN THAT CHANG YUL CHA of 1904 Glenment Drive, Bakersfield, California 93009, United States of America and WILLIAM J. BARTEL of 1032 Lakeside Court, Grand Junction, Colorado 81501, United States of America having made an invention entitled: "IN SITU OIL SHALE RETORTING" the following disclosure contains a correct and full description of the invention and of the best mode known to the inventors of taking advantage of the same. ABSTRACT A processing zone advances through a fragmented permeable mass of particles containing oil shale in an in situ oil shale retort in a subterranean formation containing oil shale. The fragmented mass has layers of formation particles of differing composition, such as kerogen content, corresponding to strata of differing composition in the formation. The processing zone advances in a direction sub- stantially perpendicular to such layers in the fragmented mass. Kerogen in oil shale is decomposed to produce gaseous and liquid products including shale oil, and shale oil is withdrawn from the retort. At least one characteristic of the shale oil withdrawn from the retort varies in response to differences in composition of such layers of formation particles through which the processing zone advances Such a characteristic can be a physical property of the shale oil such as viscosity or specific gravity, or a chemical property such as sulphur content or trace metal content. To determine the locus of the processing zone with respect to such layers in the fragmented mass, formfation is analyzed for defining the locus of at least one such layer in the fragmented mass before retorting, and shale oil withdrawn from the retort is monitored for variation of such a char- acteristic corresponding to advancement of the processing zone through such a layer in the fragmented mass.
325977
Bartel William J.
Cha Chang Y.
Occidental Oil Shale Inc.
Smart & Biggar
LandOfFree
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