The effect of in situ retorting on oil shale pillars.
Ozdemir L; Ropchan D; Miller R; Wang FD; Sladek T
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, H0262031, 1981Jan; :1-387
An investigation was made to determine the mechanical properties of oil shale at elevated temperatures and confining pressures, the thermal properties at elevated temperatures, and to provide mathematical models for mine design for in situ oil shale retorting. A review of current activity in in situ retorting is included with a comprehensive list of references. Tests were run at temperatures from 20 deg. to 500 deg. C and confining pressures to 1,500 psi with shale of 10 to 30 gal per ton. A major loss of strength occurred in heating at 140 deg. C with a partial regain from 380 deg. to 500 deg. C. Higher grade shale had a lower compressive strength. Elastic properties showed large variations. Brazilian tensile strength showed a similar temperature sensitivity as the compressive strength. Creep is a major factor in overall deformation of heated shale. Oil shale was found to be an excellent insulator. Loss of pillar support area at 800 hr of heating would be about 10 pct. Good correlation was found between a finite element model using the developed properties and an in situ heater test.
Oil shale; Mechanical properties; Thermodynamic properties; Compressive strength; Physical properties; In-situ retorting
CP; Final Contract Report
NTIS Accession No.
OFR 76-82; Contract-H0262031
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, H0262031
Colorado School of Mines