基于量纲分析的沥青钻井液重力置换规律研究
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摘要
伊朗雅达油田Kazhdumi地层沥青质稠油发育,钻井过程中裂缝常发生置换式双向流动,严重影响钻井安全,迫切需要开展重力置换规律研究,形成有效的防控技术。为了深入揭示置换发生的条件、发展规律、影响置换量的因素,文章研制了一套基于真实裂缝的可视化重力置换实验装置,研究了裂缝宽度、钻井液与沥青密度差、沥青与钻井液黏度差等对重力置换的影响。引入量纲分析理论,推导出了重力置换量的准则方程。结果表明,缝宽对置换量的影响较大,随着裂缝宽度的增加,置换量不断增加;置换量随钻井液与沥青密度差的增大而增加;随着沥青与钻井液黏度差的增大,置换量将显著减小,尤其从低黏度差到高黏度差,减小的幅度更大。提出了"化学封堵+控压钻井+物理阻隔"的综合防控技术,现场应用效果显著,可为国内外同类地层安全钻进借鉴参考。
Asphaltic heavy oil is developed extensively in Kazhdumi Formation of Yada Oilfield in Iran. Gravity replacement often occurs during drilling,which seriously affects the drilling safety. It is urgent to study the law of gravity displacement and preventive and control measures. In order to thoroughly reveal the conditions of displacement,development rules and factors affecting displacement amount,a set of visual gravity displacement experiment device is developed with real crack as the research object,and the effects of crack width,density difference between drilling fluid and asphalt,and viscosity difference between asphalt and drilling fluid on gravity displacement are studied. By introducing dimensional analysis theory,the criterion equation for the calculation of gravity displacement is derived. The results show that the effects of crack width on the displacement is very obvious. As the crack width increases,the displacement increases. The displacement increases with the drilling fluid-the asphalt density difference. While the viscosity difference between the asphalt and the drilling fluid increases,the amount of displacement will be significantly reduced,especially from low viscosity difference to high viscosity difference,the greater the reduction. A comprehensive prevention and control technology of " chemical plugging + pressure-controlled drilling + physical barrier" is put forward,and the field application is remarkable,which can be used as a reference for safe drilling in similar formations at home and abroad.
Asphaltic heavy oil is developed extensively in Kazhdumi Formation of Yada Oilfield in Iran. Gravity replacement often occurs during drilling,which seriously affects the drilling safety. It is urgent to study the law of gravity displacement and preventive and control measures. In order to thoroughly reveal the conditions of displacement,development rules and factors affecting displacement amount,a set of visual gravity displacement experiment device is developed with real crack as the research object,and the effects of crack width,density difference between drilling fluid and asphalt,and viscosity difference between asphalt and drilling fluid on gravity displacement are studied. By introducing dimensional analysis theory,the criterion equation for the calculation of gravity displacement is derived. The results show that the effects of crack width on the displacement is very obvious. As the crack width increases,the displacement increases. The displacement increases with the drilling fluid-the asphalt density difference. While the viscosity difference between the asphalt and the drilling fluid increases,the amount of displacement will be significantly reduced,especially from low viscosity difference to high viscosity difference,the greater the reduction. A comprehensive prevention and control technology of " chemical plugging + pressure-controlled drilling + physical barrier" is put forward,and the field application is remarkable,which can be used as a reference for safe drilling in similar formations at home and abroad.
引文
[1]赵向阳,孟英峰,侯绪田,等.沥青质稠油与钻井液重力置换规律与控制技术[J].石油钻采工艺,2016,38(5):622-627.
[2]路保平,侯绪田,邢树宾.伊朗雅达油田沥青层置换机制与压力波动分析[J].中国石油大学学报(自然科学版),2017,41(6):88-93.
[3]江朝,王利华,黄在福,等.雅达油田沥青层钻井风险预测方法探讨[J].钻采工艺,2017,40(4):10-12.
[4]贾红军,孟英峰,李皋,等.钻遇多压力系统气层溢漏同存规律研究[J].断块油气田,2012,19(3):359-363.
[5]舒刚,孟英峰,李皋,等.重力置换式漏喷同存机理研究[J].石油钻探技术,2011,39(1):6-11.
[6]王小兵,朱荣杰,刘保君,等.量纲分析法求解柱塞凡尔局部阻力系数[J].海洋石油,2007(6):92-96.
[7]何理,钟冬望,陈晨,等.岩质高边坡开挖施工的爆破振动监测与分析[J].金属矿山,2017(1):5-10.
[8]杨顺辉.可视化重力置换室内模拟装置的研制与应用[J].石油机械,2015,45(3):96-99.
[2]路保平,侯绪田,邢树宾.伊朗雅达油田沥青层置换机制与压力波动分析[J].中国石油大学学报(自然科学版),2017,41(6):88-93.
[3]江朝,王利华,黄在福,等.雅达油田沥青层钻井风险预测方法探讨[J].钻采工艺,2017,40(4):10-12.
[4]贾红军,孟英峰,李皋,等.钻遇多压力系统气层溢漏同存规律研究[J].断块油气田,2012,19(3):359-363.
[5]舒刚,孟英峰,李皋,等.重力置换式漏喷同存机理研究[J].石油钻探技术,2011,39(1):6-11.
[6]王小兵,朱荣杰,刘保君,等.量纲分析法求解柱塞凡尔局部阻力系数[J].海洋石油,2007(6):92-96.
[7]何理,钟冬望,陈晨,等.岩质高边坡开挖施工的爆破振动监测与分析[J].金属矿山,2017(1):5-10.
[8]杨顺辉.可视化重力置换室内模拟装置的研制与应用[J].石油机械,2015,45(3):96-99.