A Study On Baffle Type Foam Generator Internal Flowing Law

It usually comes with severely sanding production with the development of oilfields in China.The sand in the formation is easily to be carried into the wellbore,which will cause the pipeline and equipment friction and finally result in shortened life expectancy.While the coarse grain of sand is deposited in the bottom of the pile.With the continuous production of sand formation,the accumulation of sand will get more and more at the bottom of the wellbore.However,this will reduce the flow of output oil liquid or greatly affect the oil production,and even cause sand buried oil and other engineering problems.As the phenomenon of sand formation getting more and more serious,sand washing technology is getting particularly important.The bubble generator is an important equipment for sand washing.In this paper,we study the internal flow pattern of the baffled foam generator,which structure is simple at the same time the installation and maintenance are convenient.The gas and liquid are pumped into the baffled foam generator from the same inlet.Baffle can change the direction of gas-liquid flow and increase the gas-liquid collision and squeeze the physical process which improved the foaming efficiency.As a result,baffled foam generator has been widely used in oilfield.In this paper,CFD simulation method is used to build the structure model of the baffle foam generator by using Solid Works software.FLUENT software is used to simulate the flow field of the baffle foam generator for purpose of discuss the influence of baffle inclination angle on the gas volume distribution inside the foam generator to optimize the structure of the baffle foam generator.The influence of inlet gas-liquid ratio on the internal flow field of baffle foam generator is also studied.The numerical simulation results show that with the increase of the baffle angle,the turbulence is stronger,the higher kinetic energy does the gas-liquid mixed phase consumes.When the velocity of the mixed phases decreases,it can reach an equilibrium state earlier and prevent the bubble from breaking due to the higher inter-facial tension.With the increase of the volume fraction of the inlet gas phase,the velocity field distribution of the gas-liquid two-phase flow in the foam generator is getting worse.If The volume fraction of the inlet gas phase is too small or too large,it is hard to form stable bubble flow.In this paper,PIV technology is applied to the study of internal flow of baffle foam generator.We can clearly observe the flow of internal fluid and foam generation with PIVtechnology which has the advantages of accuracy and reliability.Based on the analysis of the internal flow pattern of the baffle bubble generator,the physical model of the generator is established,and the influence of the liquid flow velocity and the inlet pressure on the flow pattern is studied.Compare of numerical simulation results and PIV experimental results,the conclusion is basically consistent.The method used in this paper is feasible for the study of gas-liquid two-phase flow of baffle type foam generator.The research results can effectively provide theoretical basis for on-site sand washing technology.