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首页> 外文期刊>Applied Mathematical Modelling >Repairing force for deformed casing shaping with spinning casing swage and damage behaviour of cement sheath
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Repairing force for deformed casing shaping with spinning casing swage and damage behaviour of cement sheath

机译：旋转套管模压对变形套管成形的修复力及水泥护套的破坏行为

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摘要

In oil and gas fields, the repairing force (bit weight) is generally determined by experience when the deformed casing is repaired using the spinning casing swage. However, unreasonable repairing force easily damages the cement sheath around the deformed casing and causes pipe sticking, which results in failure of the wellbore integrity. Hence, based on the Hertz contact theory, the present study established a mechanical model to calculate the repairing force required to repair the deformed casing without a cement sheath by spinning casing swage, and the reshaping force was determined by combining the structural features of the spinning casing swage with the method of mechanics and kinetics analysis regarding axial loading and circumferential deformation of the deformed casing. Finally, a mechanical model was presented that could calculate the repairing force of the deformation casing with cement sheath using the inversion method. Repairing experiments involving three types of deformed casings (casing without cement sheath, casing with undamaged cement sheath and casing with damaged cement sheath) were performed, from which the accuracy and reliability of the mechanical model was validated. The damage behaviour of the cement sheath after casing repair was investigated based on the experimental results and the damage mechanism was analysed based on Saint-Venant's deformation compatibility principle. Analysis results showed that three types of damage, including micro-annulus, transverse fracture and longitudinal fracture, were caused by high contact pressure between the steel ball on the spinning casing swage and the internal wall of the deformed casing and pressure fluctuation during repairing. The research results provide important guidance and decision making for practical repairing measures. (C) 2019 Elsevier Inc. All rights reserved.
机译：在油气田中，修复力（钻头重量）通常由使用旋转式套管模锻修复变形套管时的经验确定。但是，不合理的修复力很容易损坏变形后的套管周围的水泥护套，并引起管道粘连，从而导致井眼完整性下降。因此，基于赫兹接触理论，本研究建立了一种力学模型，通过旋压套管模锻来计算修复没有水泥套的变形套管所需的修补力，并结合旋压的结构特征来确定整形力。利用力学和动力学分析方法对变形套管的轴向载荷和周向变形进行套管模锻。最后，提出了一种可以利用反演方法计算水泥护套变形套管修复力的力学模型。进行了三种变形套管的修复实验（无水泥套管的套管，水泥套管未损坏的套管和水泥套管损坏的套管），从而验证了力学模型的准确性和可靠性。根据实验结果，研究了套管修复后水泥护套的破坏行为，并基于Saint-Venant的变形相容原理分析了其破坏机理。分析结果表明，旋转套管型锻上的钢球与变形套管内壁之间的高接触压力以及修复过程中的压力波动引起了三种类型的损伤，包括微环隙，横向断裂和纵向断裂。研究结果为实际维修措施提供了重要的指导和决策依据。 （C）2019 Elsevier Inc.保留所有权利。

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  • 来源
    《Applied Mathematical Modelling》 |2019年第6期|425-438|共14页
  • 作者

    Deng Kuanhai; Liu Wanying; Liu Bing; Lin Yuanhua; Singh Ambrish;

  • 作者单位

    Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China|Southwest Petr Univ, CNPC Key Lab Tubular Goods Engn, Chengdu 610500, Sichuan, Peoples R China;

    Southwest Petr Univ, CNPC Key Lab Tubular Goods Engn, Chengdu 610500, Sichuan, Peoples R China;

    Southwest Petr Univ, CNPC Key Lab Tubular Goods Engn, Chengdu 610500, Sichuan, Peoples R China;

    Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China;

    Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China|Southwest Petr Univ, CNPC Key Lab Tubular Goods Engn, Chengdu 610500, Sichuan, 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

    Repairing force; Mechanical model; Repairing experiment; Deformed casing; Damage behaviour of cement sheath; Deformation compatibility principle;

    机译：修复力;力学模型;修复实验;套管变形;水泥护套损伤行为;变形相容性原理;

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