高压气井压井井筒温度场预测与影响因素分析

从反循环压井工艺特点出发,以质量守恒、动量守恒和能量守恒为理论基础,推导出反循环压井过程井筒温度场计算模型,并对压井液入口温度、压井液密度、循环时间、压井液排量、压井液导热系数、井深等对反循环压井过程中井筒温度场的影响进行分析.结果表明:随井深增加、压井液入口温度提高、压井液排量减小、循环时间缩短、压井液导热系数增大、压井液密度减小,井筒温度线向高温偏移,反之井筒温度线向低温偏移;调整压井液排量和压井液入口温度是改善井筒温度场最有效的途径.

Prediction of wellbore temperature field and analysis of influence factor for high-pressure gas well kill

According to the characteristics of reverse circulation kill and the basic principle of conservation of mass, momentum and energy, a calculation model of wellbore temperature field of reverse circulation kill process was established. The effects of inlet temperature, density, circulation time, flow rate, thermal conductivity of kill fluid and well depth on the wellbore temperature field were analyzed. The results show that with the well depth, inlet temperature and thermal conductivity of kill fluid increasing, and flow rate, circulation time, density of kill fluid decreasing, the wellbore temperature line is shifting to high temperature, otherwise the wellbore temperature line is shifting to low temperature. The wellbore temperature distribution can be improved by adjusting the flow rate and inlet temperature of kill fluid.