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钻柱偏心旋转对环空摩阻压降影响的数值模拟研究

田野 蒋东雷 马传华 徐一龙 于晓东 宋洵成

田野,蒋东雷,马传华,等. 钻柱偏心旋转对环空摩阻压降影响的数值模拟研究[J]. 石油钻探技术,2022, 50(5):42-49 doi: 10.11911/syztjs.2022104
引用本文: 田野,蒋东雷,马传华,等. 钻柱偏心旋转对环空摩阻压降影响的数值模拟研究[J]. 石油钻探技术,2022, 50(5):42-49 doi: 10.11911/syztjs.2022104
TIAN Ye, JIANG Donglei, MA Chuanhua, et al. Numerical simulation of the effects of eccentric rotation of the drill string on annular frictional pressure drop [J]. Petroleum Drilling Techniques,2022, 50(5):42-49 doi: 10.11911/syztjs.2022104
Citation: TIAN Ye, JIANG Donglei, MA Chuanhua, et al. Numerical simulation of the effects of eccentric rotation of the drill string on annular frictional pressure drop [J]. Petroleum Drilling Techniques,2022, 50(5):42-49 doi: 10.11911/syztjs.2022104

钻柱偏心旋转对环空摩阻压降影响的数值模拟研究

doi: 10.11911/syztjs.2022104
基金项目: 国家自然科学基金项目“钻井井下气液固多相流中超声波传播特性及气侵监测方法研究”(编号:52074326)和中海石油(中国)有限公司重大科技专项项目“南海西部油田上产2000万方关键技术研究”(编号:CNOOC-KJ 135 ZDXM 38 ZJ 01 ZJ)资助
详细信息
    作者简介:

    田野(1988—),男,山东青岛人,2010年毕业于中国石油大学(华东)船舶与海洋工程专业,2020年获中国石油大学(华东)石油与天然气工程专业硕士学位,工程师,主要从事海洋钻完井方面的技术管理工作。E-mail:tianye1@cnooc.com.cn

  • 中图分类号: TE21

Numerical Simulation of the Effects of Eccentric Rotation of the Drill String on Annular Frictional Pressure Drop

  • 摘要:

    准确预测钻柱偏心旋转工况下的环空摩阻压降是复杂结构井控压钻井的重要理论基础,但常规钻井液环空摩阻压降计算方法无法直接计算复杂结构井的环空摩阻压降。为此,应用数值模拟方法,分析了偏心度(0~67.42%)和钻柱转速(0~114.65 r/min)对典型环空(ϕ127.0 mm钻杆和ϕ215.9 mm井眼)中摩阻压降梯度的影响。分析结果表明:偏心度小于45.00%时,转速和偏心度对摩阻压降梯度影响较弱,摩阻压降梯度随转速增大略有降低,随偏心度增大而增大;偏心度大于45.00%时,低转速(<60 r/min)下摩阻压降梯度随偏心度增大而降低,高转速(≥60 r/min)下摩阻压降梯度随偏心度增大而略有增大。基于数值模拟结果,建立了偏心度分类的无因次偏心环空摩阻压降梯度预测模型,计算了南海某水平井ϕ215.9 mm井段的ECD,并与PWD测试结果进行了对比,平均相对误差为0.45%,表明该模型具有较好的准确性。研究结果表明,无因次偏心旋转环空摩阻压降计算模型可以精细描述环空压力场和准确计算ECD,为控压钻井水力参数优化提供指导。

     

  • 图 1  22.47%偏心度下偏心环空物理模型与网格划分

    Figure 1.  Physical model and meshing of eccentric annulus with the eccentricity of 22.47%

    图 2  偏心环空轴向流速剖面

    Figure 2.  Axial velocity profile of eccentric annulus

    图 3  偏心环空切向流速剖面

    Figure 3.  Tangential velocity profile of eccentric annulus

    图 4  轴向流速沿高边方向线分布

    Figure 4.  Axial velocity distribution along the high-sidedirection line

    图 5  切向流速沿高边方向线分布

    Figure 5.  Tangential velocity distribution along the high-side direction line

    图 6  钻井液静压力沿宽流域中心线的分布

    Figure 6.  Static drilling fluid pressure distribution along the center line of wide flow domain

    图 7  偏心环空摩阻压降梯度与钻柱偏心度的关系曲线

    Figure 7.  Variation of frictional pressure drop gradient ineccentric annulus with eccentricity of drill string

    图 8  偏心环空摩阻压降梯度与钻柱转速的关系曲线

    Figure 8.  Variation frictional pressure drop gradient in eccentric annulus with rotational speed of drill string

    图 9  南海某水平井ϕ215.9 mm井段当量循环密度计算值与实测值对比

    Figure 9.  Comparison between calculated and measured values of ECD in ϕ215.9 mm section of a horizontal well in the South China Sea

    表  1  偏心环空摩阻压降梯度数值模拟计算结果

    Table  1.   Numerical computation results of frictional pressure drop gradient in eccentric annulus

    偏心度,%不同钻柱转速下的摩阻压降梯度/(Pa·m−1
    0 r/min19.11 r/min38.22 r/min57.32 r/min76.43 r/min95.54 r/min114.65 r/min
    0898.91898.69898.73898.80898.91899.03899.18
    22.47921.99919.85916.67915.89915.74914.72912.90
    26.97930.93927.63922.68921.31921.12919.76917.43
    31.46939.65934.85927.73925.76925.82924.38921.85
    35.96946.11939.65930.41928.23929.19928.37926.25
    40.45947.04939.42929.21927.89931.11932.09931.20
    44.94938.21931.38923.14924.87932.38936.60937.83
    49.44916.31914.30912.82920.49934.65943.11946.98
    53.93882.02890.43901.17917.22939.97952.41958.70
    58.43841.34865.33892.13916.90948.91964.11971.14
    62.92800.91842.91886.76917.93957.17974.83977.08
    67.42763.60820.64879.73913.85956.12977.72968.23
    下载: 导出CSV

    表  2  无因次偏心环空摩阻压降梯度数值模拟结果

    Table  2.   Numerical simulation results of dimensionless eccentric frictional pressure drop gradient

    偏心度,%不同钻柱转速下的无因次偏心环空摩阻压降梯度
    0 r/min19.11 r/min38.22 r/min57.32 r/min76.43 r/min95.54 r/min114.65 r/min
    01.00000.99980.99980.99991.00001.00011.0003
    22.471.02571.02331.01981.01891.01871.01761.0156
    26.971.03561.03201.02641.02491.02471.02321.0206
    31.461.04531.04001.03211.02991.02991.02831.0255
    35.961.05251.04531.03511.03261.03371.03281.0304
    40.451.05351.04511.03371.03221.03581.03691.0359
    44.941.04371.03611.02701.02891.03721.04191.0433
    49.441.01941.01711.01551.02401.03981.04921.0535
    53.930.98120.99061.00251.02041.04571.05951.0665
    58.430.93600.96260.99251.02001.05561.07251.0804
    62.920.89100.93770.98651.02121.06481.08451.0870
    67.420.84950.91290.97871.01661.06361.08771.0771
    下载: 导出CSV
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  • 收稿日期:  2022-04-22
  • 录用日期:  2022-08-22
  • 修回日期:  2022-07-31

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