油套管导热系数与温度耦合模型计算井筒温度场  

A coupled calculation of wellbore temperature incorporating temperature and thermal conductivity of tubing and casing

作　　者：张智[1] 王汉[1] 

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500

出　　处：《中国科技论文》2015年第21期2539-2544,共6页China Sciencepaper

基　　金：国家科技支撑计划资助项目(2011BAE25B04);国家科技重大专项资助项目(2011ZX05023-004);四川省省属高校科研创新团队建设计划(13TD0026)

摘　　要：研究了油套管材料、水泥环、地层及井筒流体的导热系数与温度的关系,建立了井筒各组件导热系数与温度耦合变化的井筒温度场计算模型,并以井底参数为初始节点进行数值求解。采用VB.NET编制了计算程序,并开展了实例计算,对比分析了Landmark Wellcat模型、耦合模型、非耦合模型的计算结果与实测井口温度的相对误差。本文建立的耦合模型的计算结果更接近实测值,具有更高的精度,同时采用本文耦合模型研究了油套管材料、产量、开采时间和井筒流体热力学参数对井筒温度场的影响。This paper proposes a method to calculate wellbore temperature that takes into account the thermal conductivity of drill- ing components, cement, and wellbore fluids. We analyzed the relationships among wellbore temperature; thermal conductivity of tubing and casing; and thermal conductivity of cement, formation, and wellbore fluid. We then built a calculation model of well- bore temperature based on the coupled changes between temperatures and thermal eonductivities of downhole components, with downhole parameters as the initial condition of the equation. The computing program was written in VB. NET, and a calculation example was carried out to analyze the differences between the actual wellhead temperature, the results calculated by Landmark Wellcat, and coupled and non-coupled models. The coupled model analyzed the effects of tubing and casing materials, well pro- duction, the time of exploitation, and the thermodynamic parameters of wellbore fluid on wellbore temperature. The results showed that the proposed coupled model calculation was the most accurate and closest to actual values.

关 键 词：耦合 高温高产气井 油套管材料 数值模拟 导热系数 井筒温度 

分 类 号：TE931.2[石油与天然气工程—石油机械设备]