为准确预测高含硫气藏气井井筒压力、温度和硫析出规律,考虑井斜角影响以及硫的气液固3种相态特征,基于质量、动量和能量守恒定律,建立高含硫气藏气井井筒压力、温度和硫析出预测模型,并采用有限差分法和迭代法求解模型。利用现场数据,优选压缩因子算法,在验证模型准确性的基础上,预测井筒压力、温度和硫析出变化规律,并进行井筒压力和硫析出规律影响因素研究。研究表明:采用DPR算法计算压缩因子,预测的井筒压力、温度与实测数据相比,平均相对误差最小,分别为0.93%和1.06%。井筒内流体流动为单一气相和气-固两相流,不存在气-液两相流;随产气量、H2S含量、硫颗粒初始溶解度增加以及井斜角减小,井筒压力变化幅度均逐渐增大;产气量越大,硫析出位置越靠近井口,析出硫体积越大;H2S含量越高,硫析出位置距井口越近,析出硫体积越小;硫颗粒初始溶解度和井斜角越大,硫析出位置距井口越远,析出硫体积越大。该研究可为高含硫气藏的高效开发提供技术支撑。
To accurately predict the wellbore pressure,temperature,and sulfur precipitation patterns in high-sulfur gas reservoirs,based on the law of conservation of mass,momentum and energy,a predictive model for wellbore pressure,temperature,and sulfur precipitation in high-sulfur gas reservoirs was established with the comprehensive considerations of the influence of well deviation angle and gas-liquid-solid phase characteristics of sulfur;the finite difference method and iterative techniques model were used to solve the model;the compressibility factor algorithm was optimize based on field data;predictions of wellbore pressure,temperature,and sulfur precipitation trends were made after validating the accuracy of the model;and the influencing factors of wellbore pressure and sulfur precipitation patterns were studied.The results show that using the DPR algorithm for calculating the compressibility factor yields the smallest average relative errors in predicting wellbore pressure and temperature,at 0.93% and 1.06%,respectively.The fluid flow inside the wellbore is characterized as either single-phase gas or gas-solid two-phase flow,with no gas-liquid two-phase flow present.With the increase of gas production rates,H2S content,initial solubility of sulfur particles,and the decrease of well inclination,the variation range of wellbore pressure changes mounts gradually.Higher gas production rates result in sulfur precipitation closer to the wellhead with larger volumes of precipitated sulfur;higher H2S content leads to sulfur precipitation closer to the wellhead with smaller volumes of precipitated sulfur;larger initial solubilities of sulfur particles and greater well inclinations push the precipitation location further from the wellhead,resulting in larger volumes of precipitated sulfur.This research provides technical support for the efficient development of high-sulfur gas reservoirs.
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