液态CO_2相变致裂技术在布孔参数优化中的应用  

Optimization of borehole layout parameters based on fracturing technology of liquid CO_2 phase

作　　者：李豪君 王兆丰[2] 陈喜恩 赵龙[2] 周大超[2] 

机构地区：[1]煤科集团沈阳研究院有限公司,辽宁沈阳110000 [2]河南理工大学安全科学与工程学院,河南焦作454003 [3]平煤股份十三矿,河南平顶山467000

出　　处：《煤田地质与勘探》2017年第4期31-37,43,共8页Coal Geology & Exploration

基　　金：国家自然科学基金项目(51275061)~~

摘　　要：为了实现液态CO_2相变致裂技术在低透气煤层强化消突领域经济高效消突的目的,在河南平煤十三矿进行了液态CO_2相变致裂穿层强化预抽煤层瓦斯试验,在致裂影响半径研究的基础上,通过数值模拟优化和现场验证的方法,对液态CO_2相变致裂技术布孔参数进行了研究。通过不同布孔方式、孔排间距等参数下的模拟和试验,研究结果表明:先致裂孔能为后致裂孔提供爆破自由面,使爆破易向自由面上发展,区域性致裂时为减弱自由面的影响,布孔方式上易采用线性程度低的梅花形布孔方式,合理的孔间距为0.5~0.6倍的单孔致裂有效影响半径。In order to achieve the purposes of economical-effectively eliminating coal and gas outburst in low permeability coal seam areas through fracturing technology of liquid C02 phase, the paper carried out through-layer gas pre-drainage test using fracturing technology of liquid C02 phase in Pingdingshan No. 13 mine, on the basis of study of the fracturing radius of influence, through numerical simulation and field verification, the borehole layout parameters for fracturing technology of liquid C02 phase were studied. Through simulation and test with different layout and spacing of boreholes, the results showed that first fractur borehole provided the free surface for the the latter fractured borehole so as to make the fracturing developed towards the direction of the free surface, when regional fracturing was taken, it was easy to reduce the unfavorable influence of the free surface through using quincunx layout of the low linearity, the best borehole spacing was 0.5 to 0.6 times the effective influencing radius of fracturing.

关 键 词：液态C02 影响半後 布孔方式 参数优化 数值模拟 

分 类 号：TD713[矿业工程—矿井通风与安全]