复合储层层间窜流对瓦斯抽采的影响机制研究  

Influence of interlayer channeling of composite reservoir on gas drainage

作　　者：张智渊 朱传杰[1] 刘思远 李龙 ZHANG Zhiyuan;ZHU Chuanjie;LIU Siyuan;LI Long(School of Safety Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《煤矿安全》2022年第2期1-8,共8页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51874293)。

摘　　要：为了考察复合储层中围岩特性对穿层钻孔瓦斯抽采的影响,分析了煤层和岩层内瓦斯的渗流规律,基于建立的复合储层和单一储层瓦斯抽采流固耦合模型,模拟研究了不同倾角的穿层钻孔对复合储层和单一储层的瓦斯抽采效果,以及多钻孔耦合下的穿层钻孔瓦斯抽采效果。结果表明:相同钻孔抽采不同储层的煤层瓦斯时,复合储层比单一储层抽采瓦斯的抽采影响半径和有效半径大,抽采效果更好;不同倾角的钻孔对复合储层的瓦斯抽采影响不同,瓦斯抽采影响范围随夹角的增大呈降低趋势,层间窜流的影响也随之呈减弱趋势;在多钻孔耦合抽采下,复合储层中下部煤层的瓦斯压力明显低于单一储层中相同位置的瓦斯压力。In order to investigate the influence of surrounding rock characteristics on gas drainage of through layer borehole in composite reservoir, the seepage law of gas in coal seam and rock stratum is analyzed. Based on the fluid solid coupling model of gas drainage in composite reservoir and single reservoir, the gas drainage effect of cross layer borehole with different dip angles on composite reservoir and single reservoir, and gas drainage by crossing hole coupling with multiple boreholes are simulated. The results show that the influence radius and effective radius of gas drainage from composite reservoir are larger than that of single reservoir when the same drilling hole is used to extract coal seam gas from different reservoirs;the influence range of gas drainage in composite reservoir is decreased with the increase of angle, and the influence of interlayer channeling is also weakened;under the condition of multi-borehole coupling drainage, the gas pressure of the middle and lower coal seams in the composite reservoir is obviously lower than that in the same position in the single reservoir.

关 键 词：复合储层 瓦斯抽采 钻孔倾角 层间窜流 叠加效应 

分 类 号：TD712[矿业工程—矿井通风与安全]