石油学报 ›› 2018, Vol. 39 ›› Issue (5): 587-596.DOI: 10.7623/syxb201805010

• 石油工程 • 上一篇    下一篇

裂缝封堵失稳微观机理及致密承压封堵实验

邱正松1, 暴丹1, 刘均一2, 陈家旭1, 钟汉毅1, 赵欣1, 陈晓华3   

  1. 1. 中国石油大学石油工程学院 山东青岛 266580;
    2. 中石化石油工程技术服务有限公司胜利石油工程公司钻井工程技术公司 山东东营 257064;
    3. 中国石油化工股份有限公司华北油气分公司 河南郑州 450006
  • 收稿日期:2017-09-24 修回日期:2018-03-05 出版日期:2018-05-25 发布日期:2018-06-06
  • 通讯作者: 邱正松,男,1964年8月生,1985年获华东石油学院学士学位,2001年获石油大学(华东)博士学位,现为中国石油大学(华东)石油工程学院教授、博士生导师,主要从事井壁稳定理论与防塌防漏钻井液技术、复杂深层超高温超深井钻井液关键技术、海洋深水钻井液完井液技术等科研及教学工作。Email:qiuzs63@sina.com
  • 作者简介:邱正松,男,1964年8月生,1985年获华东石油学院学士学位,2001年获石油大学(华东)博士学位,现为中国石油大学(华东)石油工程学院教授、博士生导师,主要从事井壁稳定理论与防塌防漏钻井液技术、复杂深层超高温超深井钻井液关键技术、海洋深水钻井液完井液技术等科研及教学工作。Email:qiuzs63@sina.com
  • 基金资助:

    国家自然科学基金项目(No.U1562101)、国家科技重大专项(2017ZX05032-004-005,2017ZX05005-005-006,2016ZX05048)和中国博士后科学基金面上项目(2017M612344)资助。

Microcosmic mechanism of fracture-plugging instability and experimental study on pressure bearing and tight plugging

Qiu Zhengsong1, Bao Dan1, Liu Junyi2, Chen Jiaxu1, Zhong Hanyi1, Zhao Xin1, Chen Xiaohua3   

  1. 1. School of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China;
    2. Drilling Engineering and Technology Company, Shengli Petroleum Engineering Company, Sinopec Oilfield Service Corporation Shandong Dongying 257064, China;
    3. Sinopec North China Company, Henan Zhengzhou 450006, China
  • Received:2017-09-24 Revised:2018-03-05 Online:2018-05-25 Published:2018-06-06

摘要:

裂缝性地层堵漏过程中,桥接堵漏材料形成的封堵层受力学因素影响易发生失稳破坏,导致封堵层承压能力较低,产生重复性漏失。基于裂缝封堵层微观结构受力分析,探讨了挤压破碎失稳、摩擦滑动失稳、剪切错位失稳、渗透漏失失稳等4种封堵失稳破坏形式,提出了粒度降级率、表面摩擦系数、剪切强度、堆积孔隙比等评价封堵失稳的特征参数;给出了裂缝致密承压封堵物理模型,即通过合理的堵漏材料类型和粒径级配优化控制,有利于在裂缝入口端附近形成致密承压封堵层。研制了长裂缝封堵模拟实验装置,开展了致密承压封堵模拟实验研究。实验表明,不同类型堵漏材料优化协同作用,可增大封堵层抗压强度、表面摩擦系数和抗剪切强度,形成紧密堆积结构,易在裂缝入口端附近形成致密承压封堵层,提高裂缝封堵突破压力,预防井漏。

关键词: 裂缝性井漏, 封堵失稳, 致密承压封堵, 堵漏材料特征评价, 堵漏模拟实验方法

Abstract:

While plugging fractured formations, the sealing zone formed by loss circulation materials are prone to instability due to the effects from mechanical factors, resulting in low pressure bearing ability of sealing zone and repetitive loss. Based on the micro-structural stress analysis of fractured sealing zone, this study explores the compressive-crush instability, friction-sliding instability, shear-dislocation instability and seepage-loss instability pattern of sealing zone, and then proposes the characteristic parameters for evaluating plugging instability, such as granularity degradation rate, surface friction coefficient, shear strength and packing pore ratio. The pressure bearing and tight plugging physical model is put forward, i.e., by controlling the reasonable loss circulation material types and particle size gradation optimization, it is favorable to form pressure bearing and tight sealing zone near the inlet end of fracture. The experimental apparatus with long fracture slot is newly developed to carry out pressure bearing and tight plugging simulation experiment and the experiment indicate that different loss circulation materials are synergized to improve compressive strength, surface friction coefficient and shear strength for forming tight packing structure, prone to generate pressure bearing and tight sealing zone near the inlet end of fracture and improve plug breaking pressure to prevent loss.

Key words: fracture loss circulation, plugging instability, pressure bearing and tight sealing, characteristic evaluation of loss circulation materials, plugging simulation experiment method

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