NUMERICAL SIMULATION OF FLOW INDUCED CORROSION IN DOWNHOLE TUBES

In this paper, based on the modern computational fluid dynamics theory, a comprehensive mathematics model for hydrodynamic flow fields induced corrosion include the following formula,conservation of mass, conservation of momentum, conservation of the kinetic energy of turbulence and the turbulent dissipation and conservation of turbulent mass transfer of species. Based on the characteristics of hydrodynamic flow induced corrosion, a mathematics model for hydrodynamic flow fields induced corrosion is obtained. The SIMPLE algorithm is used to calculate the hydrodynamic flow fields mathematical model and the wall function is used to calculate hydrodynamic flow parameters of turbulence boundary layer near pipe wall. A computer program is designed based on Visual Basic6.0. Direct numerical simulation is employed to study the corrosion rate in downhole tubes. The numerical simulation result suggests that the corrosion of middle and upper downhole tubes is worse during the oil/gas production period normally. Application of the method and solve programs presented in this paper will help us design reasonable tube diameter and can prevent or reduce the serious corrosion and flow fields induced corrosion of downhole tubes, and reduce the maintenance cost greatly, and obtain better economic benefit using the method and calculation program in this paper.