基于力链网络表征的裂缝封堵层结构失稳细观力学机制

doi:10.7623/syxb202106006

石油学报 ›› 2021, Vol. 42 ›› Issue (6): 765-775.DOI: 10.7623/syxb202106006

基于力链网络表征的裂缝封堵层结构失稳细观力学机制

闫霄鹏¹, 许成元^1,2, 康毅力¹, 商翔宇^1,3, 经浩然¹, 林冲¹, 张敬逸¹

1. 西南石油大学油气藏地质及开发工程国家重点实验室四川成都 610500;
2. 中国石油大学(华东)石油工程学院山东青岛 266580;
3. 中国矿业大学深部岩土力学与地下工程国家重点实验室江苏徐州 221116

收稿日期:2020-03-31 修回日期:2021-04-29 出版日期:2021-06-25 发布日期:2021-07-06
通讯作者: 许成元,男,1988年9月生,2009年获西南石油大学学士学位,2015年获西南石油大学博士学位,现为西南石油大学石油与天然气工程学院副教授,主要从事储层保护理论与技术、工作液漏失控制、颗粒物质力学与颗粒流领域的科研与教学工作。Email:chance_xcy@163.com
作者简介:闫霄鹏,男,1992年8月生,2015年获西南石油大学学士学位,现为西南石油大学博士研究生,主要从事储层保护理论与技术、工作液漏失控制、颗粒物质力学等方面的研究。Email:lcm_yxp2017@126.com
基金资助:
国家自然科学基金项目（No.51604236）、四川省科技计划项目（2018JY0436）和油气藏地质及开发工程国家重点实验室开放基金项目（PLN201913）资助。

Mechanical mechanism of meso-structure instability of fracture plugging zone based on the characterization of force chain network

Yan Xiaopeng¹, Xu Chengyuan^1,2, Kang Yili¹, Shang Xiangyu^1,3, Jing Haoran¹, Lin Chong¹, Zhang Jingyi¹

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan Chengdu 610500, China;
2. School of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China;
3. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Jiangsu Xuzhou 221116, China

Received:2020-03-31 Revised:2021-04-29 Online:2021-06-25 Published:2021-07-06

摘要/Abstract

摘要： 裂缝封堵层细观结构稳定性控制着宏观结构承压能力，进而影响工作液漏失控制效果。由于缺少裂缝封堵层动态细观力学参数获取方法与细观结构演化的精细刻画方法，裂缝封堵层结构承压失稳细观力学机制尚不明确。利用自主研发的钻井防漏堵漏裂缝封堵层细观结构表征系统，模拟了承压过程中物理类颗粒材料构成的裂缝封堵层细观结构演化过程，明确了承压过程裂缝封堵层强弱力链演化特征，基于网络科学方法提取了裂缝封堵层细观力链网络，揭示了裂缝封堵层结构失稳细观力学机制。研究结果表明，裂缝封堵层承压过程伴随着细观力链的形成—破坏—再形成。强力链网络构成裂缝封堵层承压的力学基础，强力链网络断裂是裂缝封堵层承压失稳的细观力学机制。裂缝封堵层承压时，颗粒间接触力逐渐增加，强力链占比逐步升高，弱力链占比逐渐降低，链状强力链与三角形、五边形、环状等强力链相连构成了强力链网络。裂缝封堵层承压失稳后，强力链构成的网络形态断裂，演化为交错状、链状力链，强力链占比降低，弱力链占比升高。进一步提出了强力链平均抗剪强度、强力链发育程度和力链网络几何结构3类指标，作为裂缝封堵层细观结构承压稳定性主控因素，进而形成了堵漏配方封堵效果评价新方法，并为新型高封堵强度堵漏材料研发提供依据。

关键词: 防漏堵漏, 裂缝封堵层, 多尺度结构, 细观力链网络, 细观结构失稳, 光弹实验

Abstract: The structural stability of fracture plugging zone of is a key factor that determines the lost circulation control effect of fractured reservoirs.Revealing the structural instability mechanism of fracture plugging zone at the mesoscale is crucial for the selection of lost circulation materials (LCMs)and the design of leakproof formula for fractured reservoirs.Based on the theory of mechanics of granular material and the network analysis method of granular system, this paper characterizes the meso-structure force chain network structure of the fracture plugging zone composed of rigid, elastic, and fibrous materials, describes the evolution characteristics of the force chain network during pressure bearing process, and reveals the mechanical mechanism of meso-structure instability of fracture plugging zone.The research results show that the pressure process of fracture plugging zone is accompanied by the formation-failure-reformation of force chains.Under the action of external load, the LCMs contact each other to form a contact force, and the contact force is transmitted in the fracture plugging zone to form a force chain network with certain shear strength, which is the root cause why the fracture plugging zone can withstand the external load.During pressure bearing process, the strong chain network bears the main external load, and the force chains with weak and medium intensity assist in maintaining the stability of the strong force chain network.The failure of the strong force chain network shows the mechanical mechanism of the microstructure instability of fracture plugging zone.The average shear strength and development degree of the strong force chain, and the geometric structure of the force chain network are proposed as the main controlling factors of the pressure stability of the mesoscale structure of fracture plugging zone, and then a new method for evaluating the plugging effect of the plugging formula is formed, which provides a basis for the research and development of new high pressure-containment LCMs.

Key words: lost circulation control, fracture plugging zone, multi-scale structure, meso-force chain network, evolution of meso-structure under pressure, photoelastic experiment

中图分类号:

TE34

闫霄鹏, 许成元, 康毅力, 商翔宇, 经浩然, 林冲, 张敬逸. 基于力链网络表征的裂缝封堵层结构失稳细观力学机制[J]. 石油学报, 2021, 42(6): 765-775.

Yan Xiaopeng, Xu Chengyuan, Kang Yili, Shang Xiangyu, Jing Haoran, Lin Chong, Zhang Jingyi. Mechanical mechanism of meso-structure instability of fracture plugging zone based on the characterization of force chain network[J]. Acta Petrolei Sinica, 2021, 42(6): 765-775.

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基于力链网络表征的裂缝封堵层结构失稳细观力学机制

Mechanical mechanism of meso-structure instability of fracture plugging zone based on the characterization of force chain network

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