Numerical Simulation Of Heavy Oil Thermal Recovery Based On Thermo - Flow - Deformation Coupling Model

In the oil industry, steam injection thermal recovery heavy oil reservoir is a complicated and difficult engineering. In this process, the reservoir conditions change with time and space. It covers many disciplines, fluid mechanics, production engineering, heat and mass transfer, rock mechanics and so on. Therefore, the whole process of steam injection thermal recovery of heavy oil can be studied, and the steam injection recovery can be reasonably and economically. The following studies are carried out in this paper:1、The motion law and heat transfer of steam in wellbore are analyzed, and the iteration algorithm of calculating pressure and dryness distribution in wellbore is given, and the thermal sensitivity analysis of wellbore is given.2、According to the steam injection thermal recovery of heavy oil reservoir caused by stress of porous media, pore fluid pressure and temperature variations of the coupling problem, according to the fluid mechanics and mass transfer heat and the theory of rock mechanics, established saturated single-phase thermal-hydraulic-mechanical coupling model.3、Based on the coupled model, the oil injection mode of the five point well pattern is analyzed, and the numerical simulation and comparison of the COMSOL software are carried out.. Research contents are as follows:the effect of porosity and permeability on the spread of temperature; different steam injection temperature influence on rock deformation; deformation of rock skeleton steam injection time, temperature and pressure affect the scope of influence. Calculation results show that the petrophysical parameters of temperature propagation effect; high temperature will cause expansion of rock skeleton and resulted in the displacement of rock particles, and even the breakdown of rock; steam injection time of deformation, temperature and pressure have a greater impact. The importance of thermal-hydraulic-mechanical coupling model in thermal recovery heavy oil reservoirs is further illustrated by comparison and analysis.