頁巖氣井體積壓裂井筒溫度計算及套管強度變化分析
發(fā)布時間：2018-07-21 17:35
【摘要】：頁巖氣井體積壓裂排量大、時間長,壓裂過程中井筒溫度變化劇烈,引起的溫度應力對套管強度具有較大影響。在考慮壓裂液摩擦生熱以及排量與壁面換熱系數(shù)關系的基礎上,建立了頁巖氣井套管壓裂過程中井筒溫度場模型,對壓裂過程中溫度瞬態(tài)變化進行了計算。結果表明:頁巖氣井套管壓裂過程中井筒降溫幅度較大,儲層溫度為78.5℃時最大降幅達到64.7℃;跟端和趾端溫度差最大值出現(xiàn)在壓裂初期60~210 s。依據(jù)推導出的套管抗外擠強度計算公式進行強度校核分析,結果表明,溫度應力對套管抗外擠強度產(chǎn)生較大影響,且隨著壓裂排量的不斷增大,抗外擠強度降幅也不斷增大,冬季施工壓裂液排量為20 m~3/min時,套管抗外擠強度降低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，
本文編號：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，
本文編號：2136272
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