天然裂缝–断层带影响的页岩气拉链式压裂窜扰模型

doi:10.3724/1000-6915.jrme.2024.0396

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摘要针对页岩气井间压裂裂缝窜扰问题，基于有限–离散单元方法，构建考虑天然裂缝–断层结构影响的页岩气拉链式压裂数值模型。模型采用具有不同力学性质的节理单元表征天然裂缝与断层，可实现“响应井压裂–响应井关井–激动井压裂”多作业过程的连续模拟，从而准确表征拉链式压裂裂缝窜通、压力及应力干扰等物理行为。采用单裂缝扩展KGD解析解模型、水力裂缝与天然裂缝相交实验数据验证本文模型，并针对典型井段开展了实例应用对比。研究表明：相对天然裂缝，断层与水力裂缝相交时的压力降落响应动态更为显著；高应力差下，天然裂缝主要以剪切破坏为主，基质以张性破坏为主；关井初期，受裂缝流体高净压力作用，天然裂缝或断层存在继续延伸行为；井间裂缝窜通后，激动井高压流体优先借助高导流通道流入响应井，致使响应井压力升高、滤失量增加及部分裂缝重复改造，将导致激动井裂缝长度增加缓慢，整体压裂效率降低。

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	王强1
	杨郁1
	宋毅2
	沈骋2
	赵金洲1
	胡永全1
	王玉丰1

关键词 ：岩石力学, 深层页岩气, 拉链式压裂, 有限&ndash, 离散单元, 天然裂缝&ndash, 断层, 窜扰

Abstract：In order to solve the problem of fracture intersection interference between deep shale gas wells in southern Sichuan，a numerical model of shale gas zipline fracturing is constructed based on finite-discrete element method，which considers the influence of natural fracture-fault structure. The model uses joint units with different mechanical properties to characterize natural fractures and faults，which can realize continuous simulation of multiple operation processes of“response well fracturing，response well shut-in，and excited well fracturing”，so as to accurately characterize physical behaviors such as fracture intersection，pressure and stress interference. The KGD analytical solution model of single fracture propagation and the experimental data of intersection between hydraulic fracture and natural fracture are used to verify the proposed model. Furthermore，a comparative case study has been conducted for typical well sections. The research results show that compared to natural fractures，the pressure drop response dynamics are more significant when intersecting with faults and hydraulic fractures. Under high stress difference，natural fractures are mainly subject to shear failure，while the matrix is mainly subject to tensile failure. At the initial stage of shut-in，natural fractures or faults continue to extend due to the net pressure of the remaining fluid in the fractures. After the fracture intersects between wells，the high pressure fluid of the exciting well preferentially flows into the response well through the high diversion channel，resulting in the increase of the response well pressure，the increase of filtration loss and the repeated reconstruction of some fractures，which will lead to the slow increase of the fracture length and the decrease of the overall fracturing efficiency.

Key words： rock mechanics deep shale gas zipper fracturing finite-discrete element natural fractures-faults intersection interference

引用本文:

王强1，杨郁1，宋毅2，沈骋2，赵金洲1，胡永全1，王玉丰1. 天然裂缝–断层带影响的页岩气拉链式压裂窜扰模型[J]. 岩石力学与工程学报, 2025, 44(S1): 146-157.
WANG Qiang1，YANG Yu1，SONG Yi2，SHEN Cheng2，ZHAO Jinzhou1，HU Yongquan1，WANG Yufeng1. Shale gas zipper fracturing interference model influenced by natural fractures-fault zones. , 2025, 44(S1): 146-157.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0396 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/IS1/146

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