摘要
在自主研发真三轴煤岩体压裂渗流实验系统基础上,设计了一套真三轴煤岩体水力压裂实验方法。该实验方法从基本理论出发,结合工程实际设计实验方案,在实现数据采集、处理操作简单化的同时,实现了理论与实践的结合。该实验系统可根据工程实际地应力数据设计实验室真三轴水力压裂实验应力状态参数,探讨压裂液恒流、恒压及变排量注入方式对注入压力-时间曲线、水压裂缝形态的影响机制。通过本实验教学可以让学生进一步了解矿井下地应力场分布规律。同时,该实验系统可拓展性较强,能够激发学生的主观创新思维。
[Objective]As a critical component of China’s energy mix,coal resources play a vital role in the rapid development of the national economy.Therefore,the safety and efficiency of mining technology is paramount.Hydraulic fracturing technology has proven to be an effective method for enhancing coalbed methane production in mining operations,finding widespread application in coal mining,shale gas mining,and various other industries.With shallow coal mines gradually depleting,there is a continual increase in the depth of coal mining each year to meet the escalating demand for energy production and consumption.Understanding the expansion mechanism of hydraulic fractures in coal rock bodies under true triaxial stress conditions is crucial for mastering hydraulic fracturing technology.This knowledge is essential for efficiently extracting gas from underground coal mines,providing valuable guidance for developing specialized core courses on gas prevention and control in mines and predicting and preventing gas disasters,providing practical value to the mining industry.[Methods]The hydraulic fracturing test is conducted using a self-developed true triaxial coal fracturing and seepage experimental system.Triaxial stress loading in the system involves pre-pressurization via oil pumps and step-by-step pressurization using constant speed and constant pressure pumps to gradually apply and release loads.Fracturing fluid is injected into the specimen through a piston driven by the booster fluid of the constant-speed and constant-pressure pump,ensuring a stable state of constant flow and pressure during the injection process.The data acquisition and control subsystem can monitor and control other subsystems in real time,independently collecting data and generating curve diagrams.This capability enables practical comparative analysis of the pressure–time curve evolution during the injection of true triaxial samples and the hydraulic fracture expansion mechanism.By acquiring injection pressure–time curves and hydraulic fracture
作者
李波
时振
魏建平
张飞燕
LI Bo;SHI Zhen;WEI Jianping;ZHANG Feiyan(College of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China)
出处
《实验技术与管理》
CAS
北大核心
2024年第6期213-218,共6页
Experimental Technology and Management
基金
2023年河南省高等教育教学改革研究与实践项目(2023SJGLX035Y,2024SJGLX0068)
2023年度河南省本科高校研究性教学系列项目“基于一流学科与一流专业协同创建的安全卓越人才分类培养机制研究及应用”
2023年度产教融合研究项目“产教融合视域下安全工程专业实践教学内容和方法创新研究与实践”
河南省高等教育学会高等教育研究项目(202ISXHLXO11)
河南理工大学教育教学改革研究与实践项目“双一流建设背景下安全工程类专业课程质量持续提升路径研究”
2024年河南省研究生教育改革与质量提升工程项目“现代安全管理理论与方法”(YJS2024KC09)
河南省高等教育教学改革研究与实践项目(学位与研究生教育)(2021SJGLX102Y,2021SJGLX024Y)。
关键词
真三轴
水力压裂
地应力
裂缝扩展
实验教学
true triaxial
hydraulic fracturing
geo-stress
fracture extension
experimental teaching
