钻井液致密承压封堵裂缝机理与优化设计

doi:10.7623/syxb2016S2017

石油学报 ›› 2016, Vol. 37 ›› Issue (S2): 137-143.DOI: 10.7623/syxb2016S2017

钻井液致密承压封堵裂缝机理与优化设计

邱正松¹, 刘均一^1,2, 周宝义³, 暴丹¹, 窦同伟³, 肖成才³

1. 中国石油大学石油工程学院山东青岛 266580;
2. 中国石油化工股份有限公司胜利石油工程有限公司钻井工程技术公司山东东营 257064;
3. 中国石油大港油田公司石油工程研究院天津 300280

收稿日期:2016-07-18 修回日期:2016-12-18 出版日期:2016-12-30 发布日期:2017-03-08
通讯作者: 邱正松,男,1964年9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9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:
国家重点基础研究发展规划973项目（2015CB251205）和国家自然科学基金项目（No.51474236,U1562101）资助。

Tight fracture-plugging mechanism and optimized design for plugging drilling fluid

Qiu Zhengsong¹, Liu Junyi^1,2, Zhou Baoyi³, Bao Dan¹, Dou Tongwei³, Xiao Chengcai³

1. School of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China;
2. Drilling Engineering and Technology Company, Sinopec Shengli Petroleum Engineering Corporation Limited, Shandong Dongying 257064, China;
3. Research Institute of Petroleum Engineering, PetroChina Dagang Oilfield Company, Tianjin 300280, China

Received:2016-07-18 Revised:2016-12-18 Online:2016-12-30 Published:2017-03-08

摘要/Abstract

摘要：

针对钻井液防漏堵漏技术难题，借鉴微观颗粒物质力学“强力链”基本原理，提出了评价防漏堵漏材料的颗粒强度、颗粒弹性、颗粒表面摩擦等主要精细化技术指标，建立了相应的实验表征方法，揭示了基于微纳米尺度的钻井液致密承压封堵机理，给出了钻井液强化致密承压封堵优化设计方法，即通过合理的颗粒类型、粒度级配与浓度控制，刚性颗粒、弹性颗粒、纤维材料等协同封堵裂缝，可形成具有“强力链网络”的致密承压封堵层，显著提高地层承压能力。研制了钻井液封堵特性评价动态模拟实验装置，可模拟不同地层温度、压力条件下不同开度裂缝的漏失与封堵过程，为致密承压封堵机理及钻井液防漏堵漏效果评价提供了实验方法。采用所研制的封堵动态模拟实验装置，优化了不同开度楔形裂缝的强化致密承压封堵钻井液配方。实验结果表明，其具有良好的自适应裂缝开度致密封堵特性，承压能力达8 MPa以上，可显著提高地层承压能力。

关键词: 井漏, 强力链网络, 致密承压封堵剂, 防漏堵漏机理, 封堵实验

Abstract:

According to the basic principle of "force-chain" in micro-granular matter mechanics, the key fine technical indices were proposed to evaluate the particle strength, particle elasticity and surface friction of loss protection and sealing materials, so as to solve the technical difficulties in loss protection and sealing of drilling fluid. Meanwhile, the corresponding experimental characterization method was established to reveal the pressure containment and tight plugging mechanism of drilling fluid at the micro-nano scale and put forward the optimization method of tight plugging drilling fluid, i.e., using reasonable particle types, particle size gradation and concentration control, rigid particles, elastic particles and fibers were synergized to plug fractures, so as to form tight pressure containment and sealing zones with a strong force chain network and greatly improve the formation pressure containment ability. The newly-developed experimental apparatus for evaluation and dynamic simulation on the plugging characteristics of drilling fluid can simulate the loss and plugging process of fractures with different widths under different formation temperatures and pressures, providing a experimental method for pressure containment and tight plugging mechanism and plugging effect evaluation. Using this novel plugging dynamic simulation equipment, the strengthened tight-plugging formulas are also optimized for drilling fluid at the wedge fractures with different widths, which exhibits the tight plugging characteristics self-adapting to fracture widths with pressure resistance up to 8 MPa, thus improving the pressure containment ability of formations significantly.

Key words: lost circulation, strong force chain network, tight plugging agent, loss protection and plugging mechanism, plugging experiment

中图分类号:

TE254

邱正松, 刘均一, 周宝义, 暴丹, 窦同伟, 肖成才. 钻井液致密承压封堵裂缝机理与优化设计[J]. 石油学报, 2016, 37(S2): 137-143.

Qiu Zhengsong, Liu Junyi, Zhou Baoyi, Bao Dan, Dou Tongwei, Xiao Chengcai. Tight fracture-plugging mechanism and optimized design for plugging drilling fluid[J]. Acta Petrolei Sinica, 2016, 37(S2): 137-143.

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钻井液致密承压封堵裂缝机理与优化设计

Tight fracture-plugging mechanism and optimized design for plugging drilling fluid

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