| Oil is a non-renewable resource,and the sustainable and stable production and production increase of oil is related to the energy security of the country.With the difficulty of oilfield development increasing year by year,EOR technology is emerging.However,many EOR technologies are difficult to be popularized on a large scale due to the unclear micro mechanism and micro oil recovery efficiency.In recent years,the development of microfluidic technology provides a new platform for EOR research and evaluation.However,the traditional microfluidic chip fabrication process is difficult to meet the requirements of complex structure forming of porous media in simulated reservoir.Therefore,in this paper,based on the surface projection micro stereolithography technology to carry out the simulation of porous media structure and microfluidic control related research.The micro stereolithography printing system developed was used to study the preparation method of porous media microfluidic module,and the influence of photosensitive resin additive on additive manufacturing process was studied.Three kinds of simulation porous media modules for experimental study are printed.The influencing factors of printing accuracy are analyzed,and the printing process and parameters of microfluidic module are optimized.The flow of fluid in the near well formation mainly involves the percolation of porous media,and the experimental study on the process of different properties of fluid flowing into the reservoir is carried out.The surface with hydrophobic / hydrophobic region can be described in space.The surface can be used as microfluidic channel,and the surface can be used in other types of microfluidic devices.COMSOL software is used to simulate the fluid flow pattern of porous media module.A mathematical model for simulating the flow field of reservoir module is established,and the flow state of fluid in different modules is simulated.The simulation results are consistent with the experimental phenomena.In order to solve the problem of poor displacement effect of displacement fluid in low permeability area,this study simulated the modification of porous media by changing the module surface wet angle.The model is divided into high permeability and low permeability areas.The last visualization is the flow of multiphase oil and water.Because the viscosity of oil is much higher than that of water,observed the slow flow of oil in low permeability area. |
