Numerical Simulation Research Of Porous Medium Horizontal Well Based On Heavy Oil Reservoir

In recent years,due to the vigorous development and utilization of petroleum-based fossil energy,the world economy and human society have produced a high degree of development.As a major oil-consuming country,China's oil consumption has always been at a high level,and oil accounts for the total energy consumption.The proportion is gradually increasing.At present,70% of the world's remaining petroleum resources are heavy oil.my country's heavy oil resources are about 19.87 billion tons,and 4 billion tons have been proved.The average recovery of heavy oil is 46%,and the development potential is huge.Needless to say,heavy oil is becoming one of the most important energy sources.Due to the heavy viscosity of heavy oil,it is not easy to mine,so how to mine heavy oil efficiently and economically to make the reserves of heavy oil as an available resource has always been a serious problem to be faced.The reservoir structure belongs to the porous medium structure,so it is of great significance to study the heat and mass transfer problems of the reservoir porous medium.Therefore,in this paper,the method of numerical simulation is used to study the porous medium of the reservoir during thermal recovery,revealing the heat and mass change rules of the porous medium of the reservoir,and the different parameters of the horizontal well thermal recovery process in the late stage of the oil recovery rate and recovery The effect of water-oil ratio in the effluent.The main research contents are as follows:(1)Select the outlet temperature and outlet velocity of the porous medium area in the thermal recovery process as the research object,establish a two-dimensional model of the thermal recovery process of heavy oil,and use the COMSOL multi-physics numerical simulation software to simulate the thermal flow coupling effect of the porous medium The heat and mass transfer process of the paper explores the effects of the porosity,permeability,crude oil viscosity,inlet pressure and inlet temperature of the porous medium on the heat and mass transfer process of the porous medium.The results show that since the heat transfer of the porous medium is mainly affected by heat conduction and convective heat transfer,the porous medium first undergoes the heat transfer process along the inlet direction,and then the heat transfer area expands to both sides,and the outlet speed of the porous medium varies with the Due to the porosity of porous media,the permeability becomes larger and increases.Since the viscosity of crude oil has a great influence on the heat transfer of porous media,as the viscosity increases,the time for the outlet temperatureto stabilize increases,and the outlet speed also decreases.(2)Select the oil production in the later stage of the oil recovery process and the ratio of water to oil in the produced fluid as the research objects,establish a three-dimensional model of oil-water two-phase flow in the porous media of the reservoir,and conduct numerical simulation research.The oil recovery process of porous media under the action of seepage flow,and the effects of the porosity,permeability,viscosity and horizontal well length of the porous media on oil recovery and water-oil ratio are analyzed.The results show that: 500 days before the oil recovery process,the water content of the oil layer near the horizontal well increased rapidly.After 1300 days,the overall water content of the reservoir increased and the overall water level rose.Increasing the porosity and permeability of the porous media of the reservoir can increase the oil production per unit time,while reducing the water-oil ratio in the produced fluid.Relative to the porosity and permeability,increasing the length of the production horizontal well can also effectively increase oil recovery,but the water-to-oil ratio in the produced fluid increases at the same time.