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
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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。Abstract: 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.
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Keywords:
- hydraulic flushing /
- hole shape /
- hole parameter /
- pressure relief range /
- borehole layout
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