页岩气井体积压裂井筒温度计算及套管强度变化分析
发布时间：2018-07-21 17:35
【摘要】：页岩气井体积压裂排量大、时间长,压裂过程中井筒温度变化剧烈,引起的温度应力对套管强度具有较大影响。在考虑压裂液摩擦生热以及排量与壁面换热系数关系的基础上,建立了页岩气井套管压裂过程中井筒温度场模型,对压裂过程中温度瞬态变化进行了计算。结果表明:页岩气井套管压裂过程中井筒降温幅度较大,储层温度为78.5℃时最大降幅达到64.7℃;跟端和趾端温度差最大值出现在压裂初期60~210 s。依据推导出的套管抗外挤强度计算公式进行强度校核分析,结果表明,温度应力对套管抗外挤强度产生较大影响,且随着压裂排量的不断增大,抗外挤强度降幅也不断增大,冬季施工压裂液排量为20 m~3/min时,套管抗外挤强度降低16.4%。
[Abstract]:The volume fracturing of shale gas well is large, the time is long, the wellbore temperature changes sharply during fracturing, and the temperature stress has great influence on casing strength. On the basis of considering the relationship between friction heat generation of fracturing fluid, displacement rate and wall heat transfer coefficient, the wellbore temperature field model during casing fracturing of shale gas well is established, and the transient temperature variation during fracturing process is calculated. The results show that during casing fracturing in shale gas wells, the cooling range of casing is large, the maximum drop of reservoir temperature is 64.7 鈩，
本文编号：2136272
[Abstract]:The volume fracturing of shale gas well is large, the time is long, the wellbore temperature changes sharply during fracturing, and the temperature stress has great influence on casing strength. On the basis of considering the relationship between friction heat generation of fracturing fluid, displacement rate and wall heat transfer coefficient, the wellbore temperature field model during casing fracturing of shale gas well is established, and the transient temperature variation during fracturing process is calculated. The results show that during casing fracturing in shale gas wells, the cooling range of casing is large, the maximum drop of reservoir temperature is 64.7 鈩，
本文编号：2136272
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