Research On Design Optimization Of Downhole Swirl Atomization Drainage Gas Production Device

In the mid to late development stage of gasfield,the water production increases gradually.The effective drainage gas recovery technology is the key to ensure the nomal development of gasfield.The downhole swirl atomization device is a new technology which has good prospects in gasfield.This paper optimizes the design of swirl atomization device through the combination of theoretical research and numerical simulation.The main contents are as follows:(1)This paper describes the characteristics of conventional drainage and gas production technology,the application status and development trend of the swirl atomization technology in the production process;(2)Based on the basic characteristics,the transition conditions and the critical flow model of the gas-liquid two-phase flow in the vertical gas well,the conditions of the formation of the swirl atomization is analyzed,the relevant mathematical model is built and the fluid migration rule in vortex flow field is studied;(3)Through the structure and working principle analysis of swirl atomization drainage gas recovery device,the computational fluid dynamics(CFD)method was used to study the impacts of geometric parameters(i.e.swirl cylinder diameter,number of leads,helix angle,the number of spiral)on atomization effect of the device.The study results may provide necessary references for selecting optimal swirl tools and promoting performances of such tools on site.(4)By using the orthogonal design method,the geometric parameters of swirl atomization device are optimized by selecting the distribution characteristics of droplet particles as evaluation index,and the optimal parameters combination is obtained.In addition,the adaptability of optimized swirl atomization water drainage gas recovery device in different working conditions of gas well is validated and analyzed.