摘要
低温流体的注入过程若使井筒温度场发生较大变化,管柱会因温度变形而产生较大的附加轴向力,导致管柱变形和封隔器失封。为此,考虑深井、超深井井身结构特点及地层传热机理,根据能量守恒定律和热力学定律,建立深井、超深井注入过程井筒温度场模型。采用稳态假设消除时间项并连续使用解析法得到模型解析解,结合某超深井井身结构与施工参数,分析了复杂井身结构和地层温度对计算结果的影响,得到了不同注入温度和排量下井筒温度分布规律。研究结果表明,考虑复杂井身结构后模型精度更高,与井底温度的绝对误差为-0.56%,不考虑复杂井身结构的绝对误差为1.52%;地层温度对井筒温度的影响较小。研究结果可为管柱力学分析提供数据支撑、为作业参数优化提供理论依据。
If the temperature field in the wellbore changes significantly due to the injection of low-temperature fluids,the tubing may deform due to temperature changes,resulting in a large additional axial force,leading to the deformation of the tubing and the loss of the packer's seal.Therefore,considering the characteristics of the wellbore structure and the heat transfer mechanism of the strata in deep and ultra-deep wells,a model of the wellbore temperature field during the injection process in deep and ultra-deep wells is established based on the law of energy conservation and thermodynamics.The steady-state assumption is used to eliminate the time term and the analytical method is continuously used to obtain the analytical solution of the model.Combined with the wellbore structure and construction parameters of a certain ultra-deep well,the effects of complex wellbore structure and formation temperature on the calculation results are analyzed,and the distribution law of wellbore temperature under different injection temperatures and discharges is obtained.The research results show that the model accuracy is higher after considering the complex wellbore structure,with an absolute error of-0.56%compared to the bottom hole temperature,and an absolute error of 1.52%if the complex wellbore structure is not considered.The influence of formation temperature on wellbore temperature is small.The research results can provide data support for tubular mechanics analysis and provide a theoretical basis for the optimization of operation parameters.
作者
秦彦斌
王文波
李国亮
韦亮
QIN Yanbin;WANG Wenbo;LI Guoliang;WEI Liang(School of Mechanical Engineering,Xi'an Shiyou University,Xi'an Shaanxi 710065,China;Oil Testing Company of CNPC Western Drilling Company,Karamay Xinjiang 834000,China)
出处
《石油化工应用》
CAS
2024年第3期48-53,共6页
Petrochemical Industry Application
关键词
注入过程
复杂井身结构
井筒温度
injection process
complex wellbore structure
wellbore temperature
