水力冲孔孔洞形态特征及瓦斯抽采参数优化  

Morphological characteristics of hydraulic punching holes and optimization of gas extraction parameters

作　　者：刘晓[1,2] 荆天祥 宣德全 胡世雄 李勇 徐森[1] LIU Xiao;JING Tianxiang;XUAN Dequan;HU Shixiong;LI Yong;XU Sen(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region of Henan Province,Jiaozuo 454000,China;Henan Dayou Energy Co.,Ltd.,Yima 472300,China;Shaanxi Changwu Tingnan Coal Industry Co.,Ltd.,Xianyang 713602,China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454000 [2]中原经济区煤层(页岩)气河南省协同创新中心,河南焦作454000 [3]河南大有能源有限公司,河南义马472300 [4]陕西长武亭南煤业有限责任公司,陕西咸阳713602

出　　处：《煤矿安全》2023年第4期22-28,共7页Safety in Coal Mines

基　　金：国家自然科学基金青年科学基金资助项目(51804100);2015年河南省科技攻关资助项目(152102310095)。

摘　　要：目前,钻孔设计及评价时,多将水力冲孔孔洞形态等效为圆柱体,并以此作为确定有效抽采半径的重要依据之一。而孔洞形态受多因素的共同作用,故将其等效为圆柱体的科学性有待商榷。采用煤岩散体重力、摩擦力、水作用力、地应力等因素,引入并联立Bergmark-Roos方程与PKN模型,建立了描述孔洞形态的BR-PKN方程,并采用MATLAB再现了孔洞形态;为验证其准确性,在现场利用YZD18.5测井仪进行数据采集及分析,展绘了孔洞断面;利用COMSOL对等效类椭球体孔洞与圆柱体孔洞进行了模拟。结果表明:MATLAB展绘的孔洞形态为三轴均不相同的类椭球体;绘制的孔洞形态与MATLAB中的基本一致;类椭球体孔洞与圆柱体孔洞相比抽采半径、解吸表面积、有效抽采体积依次为93%、80%、117%,为钻孔布置提供了依据。At present,in drilling design and evaluation,the shape of hydraulic flushing hole is usually equivalent to cylinder,which is one of the important bases to determine the effective extraction radius.However,the shape of hole is subject to the joint action of many factors,so the scientific nature of the equivalent shape to cylinder remains to be discussed.By adopting the factors of gravity,friction,water force and in-situ stress of coal and rock mass,and introducing the parallel Bergmark-Roos equation and PKN model,the BR-PKN equation describing the pore shape is established,and the pore shape is reconstructed by MATLAB.In order to verify its accuracy,data are collected and analyzed by using YZD18.5 logging tool in the field,and the hole section is drawn.The equivalent ellipsoidal and cylindrical holes are simulated by COMSOL.The results show that the shape of the holes drawn by MATLAB is ellipsoid with different three axes.The shape of the drawn hole is basically consistent with that in MATLAB.Compared with cylindrical holes,the extraction radius,desorption surface area and effective extraction volume of quasi-ellipsoid holes are 93%,80%and 117%respectively,which provides a basis for drilling layout.

关 键 词：水力冲孔 孔洞形态 孔洞参数 卸压范围 钻孔布置 

分 类 号：TD712.6[矿业工程—矿井通风与安全]