Ucm Visco-elastic Fluid In The Sudden Expansion Channel's Flow Characteristics Study

In our country, in the early days of the oil industry polymer flooding technology.Only a few people study.Until the beginning of the 1960s, China's polymer flooding this technology began to develop gradually grow up quickly and polymer flooding is completely different from the water flooding. Water flooding, just as its name implies is to a large injection of water in oil Wells, water is used to the crude oil flooding out formation. After years of study found water flooding the gap after oil will remain part of the crude oil, i.e., water flooding has certain defects, method and one of them is the oil displacement is not complete. This is for resources, is a big waste, illustrated that China was drilling technology is relatively backward. As for the polymer research, some researchers began to try to water with high molecular weight polymer, polymer solution viscosity increases, then, with these many polymer solution instead of water displacement experiment. Got a very good phenomenon, flooding efficiency than water flooding of improving a lot. In petroleum mining industry, is also indicated that the oil recovery increased. The researchers polymer solution by using different in different kinds of port in micro displacement experiment, compared the different polymer (glycerin, polystyrene dilute amide etc) oil displacement effect of polymer solution, found a viscoelastic can improve the microscopic oil displacement efficiency, namely in the macro to enhance oil recovery can. Polymer flooding is to the water injection Wells with viscoelastic polymers, joined by adjusting the two-phase flow degrees, expand into solution than in port internal erosion, and carry out more of the oil. According to investigation, our most oilfield, basically are suitable for polymer flooding. Therefore, the polymer flooding to enhance oil recovery, which is beneficial to the final, to improve the effect of oilfield development, China's sustainable development has the vital significance.In petroleum mining industry, polymer solution has been considered to enhance oil recovery mechanism mainly is changed polymer solutions and crude oil two-phase flow degrees ratio, which greatly improve the oil displacement efficiency. In recent years, many researchers have no longer agree with this view, they think of polymer solution visco-elastic also affect oil displacement efficiency factors, but haven't researchers from quantitative angles on the efficiency of polymer flooding is analyzed. Some researchers based on different simplified pore model displacement experiment, a deep research of polymer solution viscoelastic would affect the efficiency of polymer flooding, and how to influence, how big a factor. To further improve the efficiency of polymer flooding over the problem is studied. Flexibility in visco-elastic polymer flooding in enhancing the role of oil displacement efficiency in the size of the role, need more in-depth study. These for viscoelastic oil displacement efficiency of polymer solution mechanism of improving the research, choose the polymer materials better oil displacement has the extremely vital significance.The fluid flow of viscoelastic properties research has been concerned research topic. Many researchers in some displacement experiment observed in visco-elastic polymer can drive out more oil phenomenon. Through the lab for oil displacement experiment, with water flooding in the flow of oil after the Internet are analyzed, a kind of is the reserved in porous; Another kind is on the surface of the runners wall. Experimental results show that in the use of polymer solution viscoelastic oil displacement, met with above mentioned two types of most of the oil would be brought out. Different polymer solution viscosity and flexibility are not the same. Sticky elastic polymer solution in pores in port flow, will show some of the viscosity and elasticity, and polymer solution with the port is different, the viscosity and elastic will also change. Therefore, the elastic polymer solution is to improve the microscopic oil displacement efficiency factors. In selecting different polymer materials, its oil displacement improved since the ultimate recovery will have a big difference.This article is from theory of viscoelastic fluid impact study of microscopic affected efficiency. Adopted numerous port type comparatively typical turkestan extender flow model. Many researchers are in the influence of elastic to fluid had analysis. To enhance oil recovery eventually, better use the method of polymer flooding, polymer solution of viscoelastic flow characteristics of research is very important. First of all, we should fully understand the importance of polymer flooding. Be more clear understanding of its flooding mechanism. Further research in different port of polymer solution flow characteristics. In fact, when viscoelastic fluid flow in the axon expansive flows in, because the visco-elastic with viscosity polymer solution of their ability to velocity field, stress field, streamline and pressure field have undergone significant changes. This article mainly focuses on consider this aspect content.