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Local drags of the completion string with packers in horizontal wells

机译：横向井中的packers的完成字符串的本地拖动

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摘要

The multistage stimulation technique and horizontal wells are increasingly being utilized to improve oil and gas recovery. However, the sticking that occurs due to large drag during the completion string with packers tripping into the horizontal section, resulting in an abandoned well and huge economic losses. Based on a classical drag model, this paper illustrates how local drags affect the overall stress of the completion string by a case study. Mechanical models are also presented for analyzing the local drag of packers in horizontal sections considering the effects of microsteps or slots, borehole curvatures, and caliper variation respectively. The results confirmed that the local contact force is affected by centralizers, and local drags can be magnified during their upward transmission process. It is revealed that the slopes of microsteps or slots affect more on local drag of packers than the effects of microsteps's height and slots' depth; Moreover, the local drag of the packer was found increases with the increase of the borehole curvature, but less affected by the caliper variation; As to the effect of cuttings on the local drag of packers, it is affected by cuttings size and cuttings amount and cannot be quantitatively analyzed. This research could be utilized as a theoretical reference for estimating the sticking risks of the completion string and conditioning the horizontal open hole.
机译：多级刺激技术和水平孔越来越多地用于改善油和气体回收。然而，由于在完成弦中的大拖动而导致的粘附，带有倒带进入水平部分的封隔器，导致废弃的井和巨大的经济损失。基于经典拖动模型，本文说明了本地拖动如何影响完成字符串的整体压力。还提出了考虑分别的水平部分中的封装机的局部阻力，考虑分别的效果。结果证实，局部接触力受挤压器的影响，并且在其向上传输过程中可以放大局部拖动。据透露，微步或插槽的斜坡在局部的封装机上影响了更多的封装器，而不是微步骤的高度和槽的深度的影响;此外，发现封隔器的局部阻力随着钻孔曲率的增加而增加，但受卡钳变异的影响较小;关于切割对封装器局部拖动的影响，它受切割大小和切割量的影响，并且不能定量地分析。该研究可以用作估计完井串的粘性风险和调节水平开孔的理论参考。

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  • 来源
    《Energy Exploration & Exploitation》 |2021年第1期|367-384|共18页
  • 作者

    Liang Qimin; Xia Bairu; Liu Baolin; Gao Baokui;

  • 作者单位

    China Univ Geosci Beijing Sch Engn & Technol Beijing 100083 Peoples R China|PetroChina Res Inst Petr Explorat & Dev Beijing Peoples R China;

    China Univ Geosci Beijing Sch Engn & Technol Beijing 100083 Peoples R China;

    China Univ Geosci Beijing Sch Engn & Technol Beijing 100083 Peoples R China;

    China Univ Petr Sch Petr Engn Beijing Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Drilling; horizontal well; completion string; local drag; packer;

    机译：钻井;水平阱;完成字符串;本地拖动;包装机;

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