保护冻土层的真空隔热套管性能试验与数值模拟研究

周晓晖, 苏义脑, 牛成成, 程远方, 魏佳

周晓晖, 苏义脑, 牛成成, 程远方, 魏佳. 保护冻土层的真空隔热套管性能试验与数值模拟研究[J]. 石油钻探技术, 2021, 49(3): 21-26. DOI: 10.11911/syztjs.2021050
引用本文: 周晓晖, 苏义脑, 牛成成, 程远方, 魏佳. 保护冻土层的真空隔热套管性能试验与数值模拟研究[J]. 石油钻探技术, 2021, 49(3): 21-26. DOI: 10.11911/syztjs.2021050
ZHOU Xiaohui, SU Yinao, NIU Chengcheng, CHENG Yuanfang, WEI Jia. Performance Test and Numerical Simulation Research on Vacuum Insulated Casings for Permafrost Protection[J]. Petroleum Drilling Techniques, 2021, 49(3): 21-26. DOI: 10.11911/syztjs.2021050
Citation: ZHOU Xiaohui, SU Yinao, NIU Chengcheng, CHENG Yuanfang, WEI Jia. Performance Test and Numerical Simulation Research on Vacuum Insulated Casings for Permafrost Protection[J]. Petroleum Drilling Techniques, 2021, 49(3): 21-26. DOI: 10.11911/syztjs.2021050

保护冻土层的真空隔热套管性能试验与数值模拟研究

基金项目: 国家重点研发计划项目“钻井工艺及井筒工作液关键技术研究”(编号:2016YFC0303303)资助
详细信息
    作者简介:

    周晓晖(1991—),男,山东东营人,2015年毕业于美国新墨西哥理工大学石油工程专业,2016年获英国阿伯丁大学石油工程专业硕士学位,在读博士研究生,主要从事冻土力学性质与冻土层井壁稳定方面的研究。E-mail:339762462@qq.com

  • 中图分类号: TE92

Performance Test and Numerical Simulation Research on Vacuum Insulated Casings for Permafrost Protection

  • 摘要: 针对冻土层钻井过程中可能引发的冻土融沉和井口下沉等问题,研究采用真空隔热套管保护冻土层,并采用试验和数值模拟方法研究了真空隔热套管的保温性能。试验结果显示:真空隔热套管能在限制径向传热的同时限制表面的轴向传热,减小套管表面的升温幅度和升温范围;其视导热系数远小于传统套管,在不同环境温度和钻井液温度下都具有保温性能;降低真空度可以提高其保温性能,强化其对冻土层的保护。数值模拟结果表明,真空隔热套管可以减小冻土层融化区域,降低冻土融沉和井口下沉的可能性。在此基础上,提出了降低真空度、加大套管总成内的隔热套管段长度和接箍处包裹隔热泡沫等提高真空隔热套管保温性能的工程措施。研究结果验证了真空隔热套管对冻土层保护的有效性和稳定性,对开发极地油气资源具有一定的指导作用。
    Abstract: Because permafrost settles as it thaws, there is a risk that the wellhead will sink while drilling, and therefore, vacuum insulated casings were introduced to protect the permafrost, and their thermal insulation performance was analyzed through experiments and numerical simulations. The field test results showed that the vacuum insulated casings could limit both the radial and the axial heat transfer on the surface simultaneously, which restricts the range and magnitude of temperature increase on the casing surface. Because the vacuum insulated casings have much lower apparent thermal conductivity than that of traditional casings, their thermal insulation performance can be maintained at various ambient temperatures and drilling fluid temperatures. In addition, decreasing the vacuum degree can improve their thermal insulation performance and strengthen their protection of the permafrost. The numerical simulation results indicated that the vacuum insulated casings could greatly reduce the permafrost thaw zone and lower the possibility of settling and wellhead sinking due to permafrost thaw. Furthermore, the following measures were adopted to enhance the thermal insulation performance of the vacuum insulated casings, including vacuum degree reduction, insulated casings length increase in the casing assembly, and insulation foam wrapping at the coupling. The research results have verified the effectiveness and stability of vacuum insulated casings in protecting the permafrost, so as to guide the development of oil and gas resources in the Arctic region.
  • 图  1   真空隔热套管保温性能测试系统

    1.接箍;2.密封圈;3.衬套;4.衬管;5.外管;6.真空隔热层;7.内管;8.恒温水箱;9.隔膜泵;10.高压软管

    Figure  1.   Test system for the thermal insulation performance of vacuum insulated casings

    图  2   循环不同温度流体时真空隔热套管外壁温度随时间的变化

    Figure  2.   Variation of the outer-wall temperature of a vacuum insulated casing with time under different circulating fluid temperatures

    图  3   真空隔热套管外壁温度轴向分布曲线

    Figure  3.   Axial distribution curves of temperature of the outer wall of a vacuum insulated casing

    图  4   真空隔热层在接箍内的焊缝结构示意

    Figure  4.   The weld structure of the vacuum insulated layer in a coupling

    图  5   环境温度对视导热系数的影响

    Figure  5.   Effect of ambient temperature on apparent thermal conductivity

    图  7   真空度对视导热系数的影响

    Figure  7.   Effect of vacuum degree on apparent thermal conductivity

    图  6   循环流体温度对视导热系数的影响

    Figure  6.   Effect of circulating fluid temperature on apparent thermal conductivity

    图  8   井周冻土层传热数值模型示意

    Figure  8.   Schematic numerical model of heat transfer in the permafrost around a well

    图  9   使用普通套管时钻柱内和环空内钻井液温度随深度的变化曲线

    Figure  9.   The variation curves of drilling fluid temperature in drill string and annulus with depth using commonn casing

    图  10   使用真空隔热套管时钻柱内和环空内钻井液温度随深度的变化曲线

    Figure  10.   The variation curves of drilling fluid temperature in drill string and annulus with depth using vacuum insulated casing

    图  11   使用普通套管时冻土层温度在大于0 ℃区域的分布

    Figure  11.   Regional distribution profile of the permafrost with a temperature greater than 0 °C using common casing

    图  12   使用真空隔热套管时冻土层温度在大于0 ℃区域的分布

    Figure  12.   Regional distribution profile of the permafrost with a temperature greater than 0 °C using vacuum insulated casing

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出版历程
  • 收稿日期:  2021-01-11
  • 修回日期:  2021-04-12
  • 网络出版日期:  2021-05-05
  • 刊出日期:  2021-06-15

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