摘要
利用自主研发的多场耦合煤层气开采物理模拟试验系统和旋转高压水冲孔物理模拟试验装置,开展不同冲孔转速下的水力冲孔物理模拟试验,对水力冲孔过程中的冲出煤量,冲孔后的孔洞形态及抽采过程中气体压力、流量等参数的动态演化规律进行探讨。结果表明:水力冲孔后的孔洞尺寸较大,横截面仍近似呈圆形,表面出现大小不一的槽缝,同时随着冲孔转速的提高,冲出煤量和冲孔后的孔洞等效半径整体呈增加趋势;水力冲孔后的瓦斯抽采与冲孔前相比,相同位置测点的气体压力下降速度更快,气体流量更大,卸压增透效果明显。
This paper is based on a hydraulic borehole flushing simulation using self-developed multi-field coupling testing system for coal-bed methane（CBM） and simulation test system for high-pressure rotating water jet under different rotating speed of the bore bit.We discuss the amount of flushed out coal under different situations,the appearance of the borehole and the dynamic evolving pattern of the parameters such as gas pressure and gas flow during the whole experiment.The results show that：the appearance of the borehole by hydraulic flush is larger,the section approximates to a circle with cracks on its surface.Meanwhile,with the increase of the punching speed,it appears that the amount of flushed out coal as well as the equivalent radius after flushing have also increased as a whole;various gas drainage observation locations have shown a greater drop of the gas pressure after flushing with greater gas flow,thus,the effect of pressure relief and permeability enhancement is obvious.
出处
《煤矿安全》
CAS
北大核心
2018年第1期21-24,共4页
Safety in Coal Mines
基金
国家科技重大专项资助项目(2016ZX05044002)
国家自然科学基金资助项目(51474040
51304255
51434003)
关键词
瓦斯抽采
物理模拟
卸压增透
煤与瓦斯突出
水力冲孔
gas extraction
physical simulation
pressure relief and permeability enhancement
coal and gas outburst
hydraulic borehole flushing
