Key factors in hole-sealing and pressure-relief failure of hydraulic fracturing straddle packer in coal mine

被引：4

作者：

Liu, Aiqing ^{[1
,2
,3
]}

Ju, Wenjun ^{[2
,3
]}

Zhang, Zhen ^{[2
,3
]}

Meng, Xianzhi ^{[2
,3
]}

Zhang, Jian ^{[2
,3
]}

机构：

[1] China Univ Min & Technol Beijing, Sch Energy & Min Engn, Beijing 100083, Peoples R China

[2] China Coal Res Inst, Min & Design Branch, Beijing 100013, Peoples R China

[3] CCTEG Coal Min Res Inst, Beijing 100013, Peoples R China

来源：

ENGINEERING FAILURE ANALYSIS | 2023年 / 149卷

基金：

中国国家自然科学基金;

关键词：

Coalmine; Hydraulic fracturing; Straddle packer; Hole -sealing failure; Pressure -relief failure; Shooting rod; Residual high-pressure water;

D O I：

10.1016/j.engfailanal.2023.107243

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Hydraulic fracturing technology is widely used in coal mines, and straddle packers are a key component of this technology. However, during the application of a straddle packer, potential problems occur, including hole-sealing failure and shooting rod events at the pressure-relief stage, which may result in serious harm to on-site personnel. Therefore, we here investigated the application of straddle packers in five coal mines. The failure type, rock layer in which failure occurred, and frequency of use of straddle packers were analyzed. The most common failure type was packer capsule rupture, and this mostly occurred in sandstone and mudstone strata. The frequency of use was directly related to the rock stratum structure, while hole-sealing failure occurred most easily near to rock stratum interfaces. Analysis of the mechanical behavior of straddle packer hole-sealing failure showed that soft rock strata and capsule rupture were the key factors leading to such failures. Hard and stable rock formations, appropriate expansion of the diameter of boreholes, and strict manufacturing quality control can play important roles in preventing hole-sealing failures of straddle packers. Residual high-pressure water in the packer section or upper part of the straddle packer was the key factor causing pressure-relief failure and shooting rod events; to prevent these issues, high-pressure water should be fully released, anti -channeling chains should be used, and existing straddle packer technology should be optimized.

引用

页数：10