| 直井钻井时基于截面法的中性点计算新方法 |
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| 引用本文： | 刘川福,周凯旋,庞华,梁德阳.直井钻井时基于截面法的中性点计算新方法[J].石油矿场机械,2014(10):7-12. |
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| 作者姓名： | 刘川福 周凯旋 庞华 梁德阳 |
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| 作者单位： | 中国石油大学石油工程学院; |
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| 基金项目： | 教育部“海洋油气钻井理论与工程”创新团队资助项目(IRT1086) |
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| 摘 要： | 建立直井钻井时复合钻柱局部理论模型,根据截面法推导出复合钻柱任意截面的有效轴向力计算方法。建立直井钻井复合钻柱整体模型,结合局部理论模型结论推导出实际钻井工况下复合钻柱有效轴向力计算公式和考虑液体摩阻力下及射流冲击力下钻压增量计算公式,给出了新的中性点计算方法。经实例比较分析,推导出的中性点计算公式的精度高,但计算复杂,建议在深井和超深井的钻井设计中选用。
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| 关 键 词： | 直井 钻井 中性点 计算方法 |
New Calculation Method of Effective Point When Dtilling Sttaight Wells Accotding to Ctoss Section Method |
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| LIU Chuan-fu,ZHOU Kai-xuan,PANG Hua,LIANG De-yang.New Calculation Method of Effective Point When Dtilling Sttaight Wells Accotding to Ctoss Section Method[J].Oil Field Equipment,2014(10):7-12. |
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| Authors: | LIU Chuan-fu ZHOU Kai-xuan PANG Hua LIANG De-yang |
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| Affiliation: | (College of Petroleum Engineering ,China University of Petroleum, Qingdao 266580, China) |
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| Abstract: | Composite drill string partial theory model is established when drilling straight wells to deduce calculation formula of effective axial force on composite drill string’s arbitrary cross sec-tion according to the method of cross section method.Composite drill string whole theory model is established when drilling straight wells to deduce calculation formula of effective axial force on the arbitrary cross section of composite drill string in the actual drilling condition and calculation formula of bit pressure increment considering liquid friction force and jet impact force,calculation method of new neutral point is given.Through a comparative analysis of examples,calculation formula of the neutral point of the paper is of high accuracy,but considering its computational com-plexity,drilling design in the deep and ultra deep well is recommended. |
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| Keywords: | straight well drilling neutral point calculation method |
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