摘要
气井投产前后温度和压力变化会引起油管应力及轴向变形的改变。若改变量超过某一限度则将导致封隔器解封或管柱损坏等。目前对气井油管柱研究较少,且很多研究在计算时将状态改变前后的温度压力均考虑为定值,或者将温度分布简单考虑为关于井深的线性函数,这样将导致计算结果产生较大的误差。利用考虑传热、相变、生产时间等因素的气井井筒温度、压力分布模型以及弹性力学理论分析并计算温度、气体压力、油管自重、封隔液、产气量等对油管柱应力和轴向变形的影响。将其应用于现场实际气井表明:管柱轴向变形随产量增加而增加,但增加的幅度逐渐减小;与现场实测数据对比表明,计算结果较为准确。
The change of temperature after or before gas well put into production will result in the variation of tubing string stress and axial deformation.If the variation exceeds a certain extreme,it will lead to packet unset or string damage etc.Nowadays many researches consider the temperature and pressure before and after change as constant value or take the temperature distribution as simple linear function of well depth,which will lead to big error in calculated results.To analyze and calculate the influence of temperature,gas pressure,tubing weight,packer fluid and gas production rate etc.on the tubing stress and axial deformation by utilizing the wellbore temperature and pressure distribution models which consider elasticity theory and many other factors such as heat transfer,phase change,production time etc.It is shown through the application in some gas wells that axial deformation of tubing string increases with the increase of production rate,while the increase extent declines gradually and the calculated result is more accurate compared to the actual measured data.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2008年第1期100-102,共3页
Natural Gas Industry
基金
中海油上海分公司“海上气井生产管柱密封可靠性研究”项目的研究成果
关键词
完井
气井
油管柱设计
温度
轴向变形
well completion,gas well,tubing string,temperature,axial deformation
