| Vortex drainage gas recovery technology is one of the more advanced types in the drainage and gas recovery process.In order to put down the vortex tool successfully,there must be a gap between the outer diameter of the vortex tool and the inner diameter of the tubing.This phenomenon greatly reduces the effect of water-drainage gas recovery.In order to solve this problem,this paper designs a downhole full-hole vortex tool that can achieve full-hole function.In addition,the relevant theoretical research and numerical analysis are also carried out to optimize the design of the device.The main research contents are as follows:(1)Through the method of literature review to comprehend the traditional and new drainage gas recovery technology used in gas wells and to master the development trends of vortex drainage gas recovery technology applications at home and abroad.(2)Study on the basic flow patterns and the changing conditions between flow states in multiphase flow in gas wells.The causes,conditions,hazards and prediction methods of the bottomhole liquid loading are also studied at the same time.(3)Design new vortex tools and introduce tool’s structural composition,working mechanism and delivery process.Then do the non-linear analysis of major load structures for full-hole vortex tool.(4)Simulate the full-hole vortex tools and study the law of motion in the flow field,then make numerical simulation for the full-hole and non-full-hole vortex tool under the same condition through establishing the calculation model of the two kinds of tools under the same structural parameters.Finally determine the drainage effect of the two tools under the same test index.(5)In this paper,orthogonal test method was used,in this method,taking the difference in liquid carrying rate and the pressure drop of the pipe segment as the evaluation index and the full-hole vortex tool’s structure size as the main influencing factor to optimize the structural parameters and finally to find the best one. |
PDF Full Text Request