煤炭工程 ›› 2024, Vol. 56 ›› Issue (9): 127-135.doi: 10.11799/ce202409020

• 研究探讨 • 上一篇    下一篇

水力压裂裂缝开裂压力影响因素分析及应用

赵会波   

  1. 山西天地王坡煤业有限公司,山西 晋城 048000
  • 收稿日期:2024-07-12 修回日期:2024-08-06 出版日期:2023-09-20 发布日期:2025-01-08
  • 通讯作者: 李明 E-mail:1847986835@qq.com

Influence factors and the application of cracking pressure in hydraulic fracturing

  • Received:2024-07-12 Revised:2024-08-06 Online:2023-09-20 Published:2025-01-08

摘要:

为了合理确定水力压裂的压裂时机和钻孔方位布置,从水力压裂钻孔周围的应力分布状态出发,将钻孔的方位角和倾斜角作为水力压裂裂缝起裂压力的主要影响因素,在巷道地应力场分类的基础上,从钻孔参数(方位角、倾斜角)与地应力场类型角度对水力压裂裂缝开裂压力的影响规律进行了研究。同时结合天地王坡煤矿采动影响下顶板三维主应力演化实测研究,确定了3308运输巷道压裂时机与钻孔空间布置原则,在此基础上提出受二次采动影响的3308运输巷双侧压裂方案。现场煤柱钻孔应力监测结果表明,采用双侧压裂方案相比常规压裂方案其峰值应力降低了52.9%。巷道围岩变形监测显示,双侧压裂方案与原压裂方案相比,顶板下沉量降低了14.0%,底鼓量降低了37.8%,两帮移进量降低了56.6%3308运输巷道围岩得到了较好的保护。

关键词: 水力压裂, 钻孔方位角, 地应力场, 卸压方案

Abstract:

Hydraulic fracturing top-cutting and pressure relief is the main means of pressure relief in coal mine roadways to release the roof pressure of the working face. This article theoretically analyzes the influence law of rock stratum cracking pressure during hydraulic fracturing process under different drilling parameters (azimuth angle, inclination angle) and different type of 3D stress. Based on the study 3D stress of rock stratum after mining, the hydraulic fracturing opportunity of 3310 haulage gate of the Wangpo Mine is confirmed as well as the principle of bore hole layout. The stress monitoring results show that the new fracturing scheme reduces the average peak stress by 52.9% compared to the conventional fracturing scheme. The deformation monitoring of the surrounding rock in the roadway shows that compared with the original fracturing scheme, the new fracturing scheme reduces the subsidence of the roof by 14.0%, the bottom bulge by 37.8%, and the displacement of the two sides by 56.6%. The surrounding rock of the 3308 transportation channel has been well protected.

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