液态CO_2压裂增透技术在松软煤层瓦斯治理上的应用  

Application of Liquid Carbon Dioxide Fracturing Technology in Gas Control of Soft Coal Seam

作　　者：张继兵[1] 高云[1] ZHANG Jibing;GAO Yun(Zhangji Cool Mine, Huainan Mining Group Co., Ltd., Huainan 232174, China)

机构地区：[1]淮南矿业集团张集煤矿,安徽淮南232174

出　　处：《煤矿安全》2018年第4期68-71,共4页Safety in Coal Mines

摘　　要：为提高松软煤层瓦斯治理效果,基于液态CO_2低温、低黏度、相变高压膨胀等特性,对松软煤层进行液态CO_2压裂增透实验,考察分析压裂实验后瓦斯抽采效果,研究其变化规律。实验表明:压裂孔周围形成了由壁面位移区、纵向裂隙发育区和多裂隙发育区的压裂影响区域,压注有效影响半径不少于20 m,压裂区域抽采效果提升显著,抽采混量总体呈上升趋势,抽采浓度、抽采纯量提高近1倍,压注间隔周期为10 d,10 d后呈衰减趋势;与传统的增透方式相比在安全性、时效性存在较大优势。In order to improve the gas control effect in soft coal seam, based on the low temperature, low viscosity, high pressure phase transition expansion characteristics of liquid CO2, liquid CO2 fracturing permeability enhancement test for soft coal seam was carried out, the effect of gas extraction after fracturing test is investigated and studied. Experimental results showed that the fracturing influence region is formed by wall displacement zone, longitudinal fissure development zone and multi-fracture development zone around the fracturing hole, and the effective influence radius of injection is no less than 20 m; the extraction efficiency of the fracturing area is increased significantly, the mixed amount of extraction is increased, and the extraction concentration, the pure volume of extraction is nearly doubled; the period of the injection interval is 10 d, and shows a attenuation trend after 10 d; it has great advantage in safety and timeliness compared with the traditional way of increasing permeability.

关 键 词：压裂增透 低透气性 液态CO2 瓦斯治理 抽采效果 

分 类 号：TD713[矿业工程—矿井通风与安全]