地下储气库注采井温度压力耦合分析

发布时间：2018-05-11 22:23

本文选题：注采井 + 温度　；参考：《科学技术与工程》2017年31期

【摘要】：地下储气库进行循环注气、采气作业,引起注采井筒温度、压力分布的交替变化,准确预测井筒温度、压力分布是优化设计管柱的基础。基于气体质量、动量、能量平衡方程和地层-流体径向非稳态传热模型,考虑气体的焦耳-汤姆逊效应,得到了井筒气体温度、压力、密度和流速的耦合微分方程组,采用四阶龙格-库塔方法数值求解。通过实例分析了注采工况下井筒的温度、压力分布特征及影响因素,并与Well Cat软件计算结果相比较,结果表明注气井口温度、注气压力、注采流量和作业时间影响井筒的温度压力分布。注气中,注入压力对井底压力的影响最大,对井底温度的影响很小;采气中,井口温度随流量的增加而增大,井口压力随流量的增大而减小;作业早期温度、压力随时间变化较大。
[Abstract]:The circulation gas injection and gas production operation in underground gas storage can cause the alternately change of wellbore temperature and pressure distribution and predict the wellbore temperature accurately. The pressure distribution is the basis of optimizing the design of pipe string. Based on gas mass, momentum, energy balance equation and formation fluid radial unsteady heat transfer model, considering the Joule-Thomson effect of gas, the coupled differential equations of wellbore gas temperature, pressure, density and velocity are obtained. The fourth order Runge-Kutta method is used to solve the problem. The characteristics of wellbore temperature, pressure distribution and influencing factors under injection and production conditions are analyzed by an example. The results are compared with those calculated by Well Cat software. The results show that the wellhead temperature and gas injection pressure of gas injection are calculated. Injection-production flow rate and working time affect the temperature and pressure distribution of wellbore. In gas injection, injection pressure has the greatest effect on bottom hole pressure and has little effect on bottom hole temperature; in gas production, the wellhead temperature increases with the increase of flow rate, and the wellhead pressure decreases with the increase of flow rate. The pressure varies greatly with time.
【作者单位】：中国石油集团钻井工程技术研究院;中国石油勘探开发研究院;
【基金】：中国石油集团公司课题“储气库完整性关键技术研究”(2015E-400602)和“储气库优快钻完井技术与装备研究”(2015E-4003)资助
【分类号】：TE972.2

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