Numerical Simulation Study And Structural Parameter Optimization Of Gas Well Jet Vortex Tool

With the deepening of the gas field development in our country,a lot of the moisture content of gas well is rising,both liquid gas well's own ability is reduced,wellbore liquid cannot be generated by the carrying out of the mouth of the well,caused production gas well bottom of watered-out even seriously affect the normal natural gas production,reduce the gas well drilling cycle and ultimate recovery,need of drainage gas recovery technology is used to solve such problems.Eddy vortex tools as a new type of drainage gas recovery technology is widely used in various atmospheric well solve the problem of gas well liquid loading,but the traditional vortex tool applied to reduce wellbore fluid defects leads to severe reflux cavity structure when the effective distance and high pressure loss,the problem such as short,reduce the eddy current tools,mining efficiency,therefore need to develop new type of drainage gas recovery tools in order to improve the mining efficiency of gas well.In this paper,on the basis of research the domestic drainage gas recovery technology,combined with the jet and the movement principle of vortex,put forward and designed a kind of jet vortex tools,under the condition of don't need to add other power equipment,effectively solve the traditional reflux cavity of vortex tool orientation and the problem of insufficient effective distance,improve the efficiency of traditional vortex tools high rank.In order to further clarify the effective mechanism of efflux and gas extraction by jet vortex tool,the following research was carried out by combining theoretical analysis with numerical simulation:Firstly,the minimum critical carrying velocity of liquid drop and liquid film is analyzed theoretically,and the effective length formula of swirling flow is calculated by combining the equilibrium model of liquid film force and interface disturbance wave,so as to make clear the carrying principle and the feasibility of the structure of jet vortex tool.Second,the numerical simulation method of both liquid jet vortex tools capability analysis study of numerical simulation,the results show that the fluid flow in jet vortex tool under the action of the turbulent flow into the stability of the helical annular flow,at the same time solve the traditional vortex tools guide cavity flow caused by the additional energy losses and pressure loss,high speed shaft center has risen in a spiral of gas nucleus increase the axial velocity and tangential velocity of natural gas,extended the wall annular liquid membrane maintain distance and effective length of jet vortex tools,and effectively improve the ability of the sustainable exploitation of gas well and efficiency.On this basis,the main structural parameters of the vortex are simulated and compared from the three aspects of the gas phase velocity,tangential velocity and gas-liquid separation effect at the exit position to determine the factors affecting the liquid carrying efficiency of the jet vortex tool.Results show that the jet vortex tools helical gear diameter,diversion cone angle and pitch change of gas well in gas axial velocity and tangential velocity and gas-liquid separation effects significantly,spiral wing section and the number of lead angle effect on jet vortex tools are relatively small,spiral wing section for eddy current tools of trapezoidal jet of gas liquid two phase fluid helical rectifying effect compared with rectangular or circular cross section is more obvious,the subsequent gas liquid two phase separation,more fully wall to form annular liquid membrane is more stable.Finally,considering the comprehensive influence of different structural parameter combinations and gas well conditions on gas production efficiency of jet vortex drainage,an orthogonal optimization test is designed to optimize the structural parameters of jet vortex tools respectively when the gas-liquid conditions are constant and change.The optimal structure parameters of the jet vortex tool under different gas-liquid conditions and the significant influence of the structure parameters of the jet vortex tool on the exit velocity under different gas-liquid conditions are obtained.