Numerical modeling of thermal conductive heating in fractured bedrock.
Numerical modeling was employed to study the performance of thermal conductive heating (TCH) in fractured shale under a variety of hydrogeological conditions. Model results show that groundwater flow in fractures does not significantly affect the minimum treatment zone temperature, except near the beginning of heating or when groundwater influx is high. However, fracture and rock matrix properties can significantly influence the time necessary to remove all liquid water (i.e., reach superheated steam conditions) in the treatment area. Low matrix permeability, high matrix porosity, and wide fracture spacing can contribute to boiling point elevation in the rock matrix. Consequently, knowledge of these properties is important for the estimation of treatment times. Because of the variability in boiling point throughout a fractured rock treatment zone and the absence of a well-defined constant temperature boiling plateau in the rock matrix, it may be difficult to monitor the progress of thermal treatment using temperature measurements alone.
Baston
Daniel P
DP
Department of Civil Engineering, Queen's University, Kingston, Ontario, K7L 3N6, Canada.
Falta
Ronald W
RW
Kueper
Bernard H
BH
D052918:Environmental Restoration and Remediation / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry*; D006361:Heating; D008962:Models, Theoretical; D013696:Temperature; D013814:Thermal Conductivity; D014872:Water Movements; D014877:Water Pollution, Chemical / Q000517:prevention & control*