深井超深井注入过程井筒温度场模型研究及应用
Research and application of wellbore temperature field model of deep and ultra-deep well injection process
秦彦斌 1王文波 1李国亮 2韦亮2
作者信息
- 1. 西安石油大学机械工程学院,陕西西安 710065
- 2. 中国石油集团西部钻探公司试油公司,新疆克拉玛依 834000
- 折叠
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.
Abstract
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 pack-er'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 tem-perature 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 ana-lytical solution of the model.Combined with the wellbore structure and construction parame-ters 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 tem-perature under different injection temperatures and discharges is obtained.The research re-sults show that the model accuracy is higher after considering the complex wellbore struc-ture,with an absolute error of-0.56%compared to the bottom hole temperature,and an ab-solute 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 da-ta support for tubular mechanics analysis and provide a theoretical basis for the optimization of operation parameters.
关键词
注入过程/复杂井身结构/井筒温度Key words
injection process/complex wellbore structure/wellbore temperature引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据