打孔衬管完井渗流场的有限元分析

The Finite Element Analysis about Seepage Flow of Perforated Liner Completion

研究元坝地区海相碳酸盐岩气藏打孔衬管完井渗流规律,在充分考虑真实天然气的偏差因子、密度以及黏度随压力变化情况的基础上建立渗流数学模型;同时利用COMSOL Multiphysics软件对该模型进行求解计算,获得打孔衬管完井方式下近井壁的渗流场分布。研究表明:衬管完井渗流场中从供给边界到井底之间压力表现为明显的"压降漏斗"趋势,与常规解析解趋势相一致;当气体在远离井筒位置时渗流速度很小并且流速接近稳定,在井筒附近区域渗流速度分布呈波浪式,其中两端的渗流速度最大,为速度敏感性分析的重点。

This thesis focuses on the marine carbonate gas reservoirs＇ perforated liner completion seepage law of Yuanba area,and considering the real gas deviation factor,density,and viscosity based on pressure,it also established the mathematical model. With the help of COMSOL Multiphysics software,the model could carry on seepage calculation,and then get near well seepage field distribution of perforated liner completion. The research obtained that the pressure change obviously shown as cone of depression from supply boundary to hole bottom,consistent with the trend of conventional analytical solution. When the gas in the wellbore location away from the flow rate of the flow velocity is small and close to stable,near-wellbore region wavy flow velocity distribution in which the maximum flow velocity at both ends,with emphasis on the speed of the sensitivity analysis.