Simulation Of Temperature Field With Linear Well Pattern For Heavy Oil In-situ Combustion

The proportion of heavy oil in oil exploitation is increasing gradually.The key to effective exploitation of heavy oil is viscosity reduction.The viscosity reduction of In-situ combustion was studied and the influence of different factors on the temperature field of heavy oil reservoir is simulated under different conditions in this paper.Physical model of linear In-situ combustion for heavy oil was established with Spaceclaim,the control equation in fluent solver is numerically solved by finite volume method,and the temperature field distribution of linear In-situ combustion is simulated.The influence of porosity and injection pressure on the temperature field distribution of In-situ combustion was numerical simulated.The results show that the temperature gradient of the reservoir increases with the increase of porosity.The pressure drop between injection well and production well increases with the increase of injection well pressure.The transient change of reservoir temperature field is that the peak value of transient temperature is larger and the time to reach steady state is shorter when the fire line is pushed further and porosity and injection pressure are higher.UDFs is programmed by C language to express variable coefficient heat conduction function in heavy oil reservoir in this paper,the evolution of temperature field was simulated numerically when the constant thermal conductivity and the variable coefficient heat transfer function are used.The results show that the thermal conductivity for the heat transfer is positive,the effect of the variable coefficient heat conduction function on the temperature field of the reservoir is increasing with the advance of the fire line.In addition,the effect of the variable coefficient heat conduction function with larger initial heat value on the temperature field of the reservoir is obvious.Reasonable adjustment of temperature field can effectively improve the viscosity reduction of heavy oil and improve the recovery of heavy oil which has great significance to the industrial exploitation of heavy oil.The numerical simulation results can provide theoretical basis for the viscosity reduction of heavy oil In-situ combustion.