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隔水管注气双梯度钻井井筒参数计算研究

毛良杰 张孝诚 薛继彪 詹宁 刘君

毛良杰,张孝诚,薛继彪,詹宁,刘君. 隔水管注气双梯度钻井井筒参数计算研究 [J]. 应用数学和力学,2022,43(4):401-415 doi: 10.21656/1000-0887.420065
引用本文: 毛良杰,张孝诚,薛继彪,詹宁,刘君. 隔水管注气双梯度钻井井筒参数计算研究 [J]. 应用数学和力学,2022,43(4):401-415 doi: 10.21656/1000-0887.420065
MAO Liangjie, ZHANG Xiaocheng, XUE Jibiao, ZHAN Ning, LIU Jun. Research on Calculation of Riser Gas Injection Dual-Gradient Drilling Wellbore Parameters[J]. Applied Mathematics and Mechanics, 2022, 43(4): 401-415. doi: 10.21656/1000-0887.420065
Citation: MAO Liangjie, ZHANG Xiaocheng, XUE Jibiao, ZHAN Ning, LIU Jun. Research on Calculation of Riser Gas Injection Dual-Gradient Drilling Wellbore Parameters[J]. Applied Mathematics and Mechanics, 2022, 43(4): 401-415. doi: 10.21656/1000-0887.420065

隔水管注气双梯度钻井井筒参数计算研究

doi: 10.21656/1000-0887.420065
基金项目: 国家自然科学基金(52174006);国家重点研发计划(2019YFC0312303)
详细信息
    作者简介:

    毛良杰(1987—),男,教授,博士,博士生导师(通讯作者. E-mail:maoliangjie@foxmail.com

  • 中图分类号: O29

Research on Calculation of Riser Gas Injection Dual-Gradient Drilling Wellbore Parameters

  • 摘要:

    基于隔水管注气双梯度钻井过程中隔水管环空多相流特性,建立了隔水管注气双梯度钻井环空多相流模型,采用有限差分法对模型进行求解,结合墨西哥湾某口深水井现场数据,分析了钻井参数对井底压力和环空压力的影响,并对注气流量的影响因素进行讨论。研究结果表明:隔水管注气双梯度钻井井底压力比常规钻井更低,更适用于海底窄密度窗口钻井;隔水管注气双梯度钻井在钻井过程中注气流量的大小对井底压力和环空压力影响较大;水深和钻井液密度是影响注气流量的两个重要因素。在隔水管注气双梯度钻井参数设计时,应选择合适的注气流量,且钻井液密度不宜过大,以确保隔水管注气双梯度钻井安全。该研究对隔水管注气双梯度钻井设计及现场作业具有指导意义。

  • 图  1  隔水管注气双梯度钻井物理模型

    Figure  1.  The physical model for dual-gradient drilling with riser gas injection

    图  2  气相质量守恒的物理模型

    Figure  2.  The physical model for mass conservation of the gas phase

    图  3  网格划分及离散单元区域示意图

    Figure  3.  Schematic diagram of grid division and a discrete unit area

    图  4  求解流程图

    Figure  4.  The solution flow chart

    图  5  模拟结果对比图

    Figure  5.  Comparison of simulation results with measured results

    图  6  隔水管注气双梯度钻井注气过程中压力及温度变化:(a) 注气双梯度钻井和常规钻井环空压力分布;(b) 注气双梯度钻井井底压力;(c) 环空压力云图;(d) 井筒温度场变化规律

    Figure  6.  During the gas injection process of dual-gradient drilling with riser gas injection: (a) the annulus pressure distributions in dual-gradient drilling and conventional drilling; (b) the bottom hole pressure in dual-gradient drilling with gas injection; (c) the annulus pressure contour ; (d) variation laws of the wellbore temperature field

    图  7  不同注气流量下压力、含气率及速度的变化:(a)环空压力;(b) 井底压力;(c) 泥线处含气率;(d) 气液速度

    Figure  7.  At different gas injection flow rates: (a) the annulus pressure; (b) the bottom hole pressure; (c) the gas content at the mudline; (d) the gas-liquid velocity variation

    8  不同钻井液排量下压力、含气率及速度的变化:(a) 环空压力;(b) 井底压力;(c) 泥线处含气率;(d) 气液速度

    8.  Under different drilling displacements: (a) the annulus pressure; (b) the bottom hole pressure; (c) the gas content at the mudline; (d) the gas-liquid velocity variation

    图  9  不同钻井液密度下压力、含气率及速度的变化:(a) 环空压力;(b) 井底压力;(c) 泥线处含气率; (d) 气液速度

    Figure  9.  Under different drilling fluid densities: (a) the annulus pressure; (b) the bottom hole pressure; (c) the gas content at the mudline; (d) the gas-liquid velocity variation

    图  10  水深、钻井液密度、钻井液排量对注气量的影响:(a) 水深;(b) 钻井液密度; (c) 钻井液排量

    Figure  10.  The effects on gas injection: (a) the water depth; (b) the drilling fluid density; (c) the drilling fluid displacement

    表  1  墨西哥湾某口深水井基础数据

    Table  1.   Basic data of a deep water well in the Gulf of Mexico

    parametervalueunit
    well depth 7132 m
    water depth 1828 m
    riser ID 488 mm
    choke line ID 114 mm
    casing OD 298.45 mm
    casing ID 273 mm
    drilling fluid density 1.12 g/cm3
    drilling fluid displacement 34 L/s
    formation pressure 119.4 MPa
    nitrogen injection rate 22 m3/min
    gas injection pipeline ID 31.75 mm
    drill pipe OD 88.9 mm
    geothermal gradient 0.03 ℃/m
    plastic viscosity 28 mPa·s
    下载: 导出CSV

    表  2  墨西哥湾某口深水井相关计算参数

    Table  2.   Related calculation parameters of a deep-water well in the Gulf of Mexico

    parametervalueunit
    water depth 1980 m
    well depth 3498 m
    drilling fluid density 1.2 g/cm3
    drilling fluid viscosity 31 mPa·s
    riser ID 488 mm
    choke line ID 114 mm
    casing OD 298.45 mm
    casing ID 273 mm
    drilling fluid displacement 34 L/s
    gas injection flow 15 m3/min
    sea water density 1.02 g/cm3
    drill pipe OD 127 mm
    gas injection pipeline ID 31.75 mm
    geothermal gradient 0.03 ℃/m
    gas injection pipeline diameter 88.9 mm
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-03-09
  • 修回日期:  2021-10-06
  • 网络出版日期:  2022-03-10
  • 刊出日期:  2022-04-01

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