Mathematical Model of Stress- Seepage - Temperature Three Field Coupled in Heavy Oil Reservoir

In the process of oil and gas exploration, especially in the processes of high-pressure water injection, heavy oil thermal recovery etc, reservoir pressure and temperature is changing constantly that leads to deformation of porous media, and reservoir deformation would affect the changing of the reservoir pressure and temperature in turn. Reservoir pore seepage, temperature and rock deformation influence each other, which is called seepage-stress (strain) -temperature three field coupled. Combining rock mechanics, thermal conduction study, fluid mechanics in porous medium, petroleum engineering, reservoir physics and other disciplines, the mathematical model of the reservoir temperature field, stress field and fluid flow field coupling (1)is established. According to different interactions of three field coupled, studying the different mode of three field coupled, a guideline of solving exactly is provided for the three coupled model. The model provides the theoretical foundation for the numerical simulation of thermal recovery, borehole stability of thermal recovery and ground subsidence caused by mining etc.