固相流动对垂直气井井筒压降影响的数值模拟

摘要

为了准确估算垂直气井井底压力,更精确地预测单井产量,在总结前人有关垂直井简单相管流井筒压降计算方法的基础上,建立了固相流动对垂直气井井筒压降影响的数值模型.该模型考虑了直井中气相湍流、固相颗粒流动及Moody摩擦系数对井筒压降的影响,扩展了Adekomaya等(2011年)及Sukkar&Comell提出的单相垂直管流井筒压降计算方法.模型计算结果表明,固相流动对井筒压降影响显著,而前人提出的计算模型未能考虑其影响；相同条件下,当有固相颗粒伴随流体产出时,井筒压降高于无固相颗粒产出时的井筒压降；固相含量越高、固相相对密度越大,井筒压降越大,压力随深度的增加降低越快.图5参13%To predict bottom-hole pressure accurately and project the achievable production rate from a gas well with large accuracy,a modelling of solid flow effect on pressure drop in a vertical gas well is proposed.This model incorporates the effect of turbulence,solid transport and Moody friction factor,it is an extension of Adekomaya et al(2011)and Sukkar and Comell method for determination of pressure drawdown in vertical gas well.The results obtained show that solid transport contributes significantly to pressure drop which other models fail to take cognizance of.The pressure drop is higher when solid accompanies the flowing fluid than when solid is not present.It is concluded that the greater the specific gravity of solid and solid holdup,the higher the pressure drop.