Numerical Simulation Of Temperature Field For The In-situ Upgrading Of Oil Shale

In-situ upgrading technology is one of the international forefront technologies for developing energy. This thesis is mainly focused on the change of temperature field of oil-shale during the In-situ upgrading process.In this thesis,commercial simulator FLUENT is applied to calculating the temperature field of oil shale under electric heating and convection heating respectively. Some detailed properties,such as weighted average temperature,rate of oil yield(Rate of oil yield is percentage of output of shale-oil in the total shale-oil),rate of heat loss (Rate of heat loss is the percentage of energy absorbed by base rock in total energy),thermal costs per unit (Thermal costs per unit is the ratio of heat absorbed by the whole area and the volume completely mined),are employed to evaluate the quality of each model. The influence patterns are determined after analyzing parameters.In order to research the effects of heater pattern,well temperature,the distance between heater wells and production wells in electric heating method,we use FLUENT to establish three-dimensional models respectively. Numerical simulation represents the temperature field,and we deal with the results with FORTRAN. Then we analyze the contours of temperature,the relationship between temperature and heating time,the relationship between rate of oil yield and heating time,the relationship between rate of heat loss and rate of oil yield,the relationship between thermal costs per unit and heating time. Three-dimensional results show that at the same heating time of the hexagon heater pattern,temperature and rate of oil yield are higher while its thermal costs per unit are lower. At the same rate of oil yield, loss rate was the lowest for hexagon heater pattern. The hexagon heater pattern is the best of three heater patterns. In the same heater pattern,the model with higher heating temperature or closer distance has higher temperature and output rate of shale-oil while its thermal costs per unit are lower at the same heating time.At the same rate of oil yield,the model with higher heating temperature or closer distance has lower rate of heat loss.In order to research the effects of the crack location and the availability of adiabatic facilities in convection heating method,we apply FLUENT to establishing two-dimensional model. The temperature field is calculated,and we deal with the results with FORTRAN. Then we analyze the contours of temperature , the relationship between temperature and heating time,the relationship between rate of oil yield and heating time,the relationship between rate of heat loss and rate of oil yield , the relationship between thermal costs per unit and heating time. Two-dimensional results show that considering the heating time,rate of oil yield,rate of heat loss,energy cost per unit and other factors,the model with a crack in the lower position performs better than the one with a crack in the middle of oil shale. The model with adiabatic facilities performs better than the one with no facilities.In order to compare electric heating with convection heating,a two-dimensional electric heating model is established. The two-dimensional result shows that considering the effectiveness of heating,rate of oil yield,rate of heat loss,and thermal costs per unit,electric heating is superior to convection heating method to some extent.