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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筒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&Cornell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。
In order to accurately estimate the bottom hole pressure in a vertical gas well and predict the single well production more accurately, based on the previous calculation methods of wellbore pressure drop in vertical wellbore tubular flow, the effect of solid flow on the wellbore pressure drop in a vertical gas well Numerical model. This model considers the effects of gas-phase turbulence, solid-phase particle flow and Moody friction coefficient on wellbore pressure drop in vertical wells. It expands the calculation method of single-phase vertical tube wellbore pressure drop proposed by Adekomaya et al. (2011) and Sukkar & Cornell. The model calculation results show that the solid-phase flow has a significant impact on the wellbore pressure drop, while the calculation model proposed by the predecessor can not consider its influence. Under the same conditions, when the solid particles accompany the fluid output, The pressure drop of the wellbore during phase grain production; the higher the solid phase content, the larger the relative solidity density, the greater the pressure drop in the wellbore and the lower the pressure increase as the depth increases.