煤矿安全2019，Vol.50Issue(8)：5-9,5.DOI:10.13347/j.cnki.mkaq.2019.08.003
考虑煤体层理方向效应的液态CO2致裂增透规律
Fractures and Permeability Improvement Law of Liquid CO2 Considering Direction Effect of Coal Bedding
摘要
Abstract
To study the effect of the coalbed bedding orientation on the fracturing effect during the cyclical infusion of liquid CO2, the non-metallic ultrasonic detector and low-field NMR spectrometer were used to study the degree of damage and pore development of different liquid CO2 injection. The results show that coal seam bedding has a certain degree of influence on the freeze-thaw damage mode and internal pore development of coal. The bedding orientation firstly affects the crack initiation position of the coal body, and then affects its failure mode and pore expansion, extension, and connectivity. With the increase of cycle numbers of injecting liquid CO2, the cracks caused by frost heave expansion and contraction of the coal surface gradually increase. The original pores in the coal increase and produce new ones, and different bedding azimuth effect is different.关键词
液态CO2/煤体层理/循环注入/损伤程度/孔隙/致裂增透Key words
liquid CO2/coal bedding/cyclic injection/degree of damage/porosity/fractures and permeability improvement分类
矿业与冶金引用本文复制引用
翟成,马征,张建国,徐吉钊,孙勇..考虑煤体层理方向效应的液态CO2致裂增透规律[J].煤矿安全,2019,50(8):5-9,5.基金项目
国家自然科学基金资助项目(51774278) （51774278）
江苏省自然科学基金杰出青年基金资助项目(BK20170001) （BK20170001）
