Research Of Heavy Oil Thermal Recovery Three Fields Coupling Numerical Simulation Based On Finite Element

Our country owns abundant heavy oil resources,and heavy oil resources have been effectively explored and utilized in every major oilfields.Seeing heavy oil exploitation,thermal recovery is always chosen as the main development method.However,injection of high temperature steam or hot water could dramatically changes the temperature system of the reservoir,other physical properties of oil and fluids are changed at the meantime.During the processes of heavy oil development,because of the tremendous changes of temperature,the effects of temperature on rock frame could not be ignored,and the formation will involve in complex coupled thermo-hydro-mechanical.Considering the difficulty of application and feasibility,finally I choose hot water flooding to develop heavy oilfield in so many kinds of techniques.Stating equations of fluids and rock could be established.Basing on the law of conservation of mass and the law of energy conservation as the basis,combined with the stress-strain relationship of rock under various temperature and fluids flow equations etc,it's also possible to establish coupled thermo-hydromechanical mathematical model of heavy oil reservoir which includes seepage control equation of oil and water,rock deformation control equation and temperature field control equation,then all the coupling equations could be solved using the fully coupled algorithm combined with definite condition and initial condition.The model we established is a fully coupled model,we can find parameters of other two fields in every control equation.I use the established mathematical model to make finite element software.By analyzing the case of hot water flooding developing heavy oilfield,the established mathematical model is right and it is available to use hot water flooding to develop heavy oilfield.The theory of coupled thermo-hydro-mechanical can be the guidance developing heavy oilfield.