基于赫巴流体的薄弱地层套管下放速度预测
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摘要
井筒压力波动是钻井过程中不可避免的潜在安全隐患。特别是固井环节,在薄弱地层,套管下放速度过快,很容易压漏地层,因此薄弱地层固井环节套管下放速度的控制显得尤为重要。文中以赫-巴流变模型为基础,计算井筒激动压力,在薄弱层段,以钻井时最大循环压耗与静液柱压力之和来代替下套管时有效液柱压力最大值,建立了新的套管安全下放速度计算模型。实例验证,误差为8.6%,表明该模型在薄弱地层具有较高的计算精度,可以为现场薄弱层段下放套管提供一定的参考。
Pressure fluctuation in the wellhole is an inevitable potential security risks during drilling. Especially during well cementation in the weak formations,it is easy to cause formation breakdown when casing running velocity is too fast,so it's important to control casing running velocity during cementing process. In this paper,the wellbore fluctuation pressure was calculated using Hershel-Buckley rheological model. The sum of the maximum circulation pressure loss and hydrostatic pressure during drilling was taken as the maximum effective hydrostatic pressure during casing running and a new model for calculating casing running velocity in the weak layers was set up. The model was verified by the practice,the error was 8. 6%,which showed that the model produced high calculation accuracy,providing reference for casing running in weak layers.
Pressure fluctuation in the wellhole is an inevitable potential security risks during drilling. Especially during well cementation in the weak formations,it is easy to cause formation breakdown when casing running velocity is too fast,so it's important to control casing running velocity during cementing process. In this paper,the wellbore fluctuation pressure was calculated using Hershel-Buckley rheological model. The sum of the maximum circulation pressure loss and hydrostatic pressure during drilling was taken as the maximum effective hydrostatic pressure during casing running and a new model for calculating casing running velocity in the weak layers was set up. The model was verified by the practice,the error was 8. 6%,which showed that the model produced high calculation accuracy,providing reference for casing running in weak layers.
引文
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[8]郝俊芳.平衡钻井与井控[M].北京:石油工业出版社,1982.
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[10]Burkhardt J A.Wellbore pressure surges produced by pipe movement[J].J.Pet.Tech.1961,13(6):595-605.
[11]樊洪海,刘希圣.赫歇尔-巴尔克莱液体同心环空轴向流流核及压降计算[J].石油大学学报(自然科学版),1993,17(6):28-34.
[2]付华才,刘洋,孙政,等.套管下入激动压力计算模型及影响因素分析[J].钻采工艺,2013,36(3):15-17.
[3]陈家琅.钻井钻井液的管流公式集[J].大庆石油学院院报,1981,4(3):99-111.
[4]西南石油学院钻井液流变学研究组.适合于钻井液的流变模式的初步评价[J].西南石油学院学报,1983,5(4):17-37.
[5]樊洪海,刘希圣.赫歇尔-巴尔克莱液体直井稳态波动压力计算模式[J].石油钻探技术,1994,22(1):51-54.
[6]戴金玲.套管最大安全下放速度的确定与监控[J].石油矿场机械,2011,40(2):65-67.
[7]汪海阁,苏义脑.预测宾汉流体中最大下套管速度的实用方法[J].石油钻采工艺,1997,19(3):6-9.
[8]郝俊芳.平衡钻井与井控[M].北京:石油工业出版社,1982.
[9]樊洪海.实用钻井流体力学[M].北京:石油工业出版社,2014.
[10]Burkhardt J A.Wellbore pressure surges produced by pipe movement[J].J.Pet.Tech.1961,13(6):595-605.
[11]樊洪海,刘希圣.赫歇尔-巴尔克莱液体同心环空轴向流流核及压降计算[J].石油大学学报(自然科学版),1993,17(6):28-34.