一种低透气性煤层脉冲压裂增透抽采瓦斯方法技术

一种低透气性煤层脉冲压裂增透抽采瓦斯方法，先从煤层、高位巷或低位巷通过矿用防爆、频率和压力可调的脉冲式煤层高压注水装置，利用脉冲压力最大为35MPa，流量约为300L/min，脉冲频率0~1460次/min的高压脉冲水在煤体钻孔内部的周期性变化所产生的脉冲水力效应，迫使煤层中的宏观裂隙扩展联通，并促使微小孔裂隙形成和逐渐张开，形成新的再生裂隙网，提供水在煤层中的渗透通道，从而达到改善煤体的力学性质、降低工作面前方煤体的应力、提高瓦斯的排放速度的效果，该方法使得煤层卸压范围大、整体卸压充分，压裂影响区域半径可达10~40m，煤体透气性可提高100~1000倍，其方法简单，操作容易，效果好。

Low permeability coal seam pulse fracturing enhanced permeability methane extraction method

A pulse of low permeability coal seam fracturing permeability gas drainage method, first from coal, high or low pulse by Xiang Xiang coal mine explosion-proof type high-pressure water injection device, frequency and adjustable pressure, the pulse pressure was 35MPa, the flow is about 300L/min, the effect of pulse hydraulic pulse frequency of 1460 /min high voltage 0~ changes in pulse periodic water in drilling coal produced by forcing the macro cracks in coal seam expansion Unicom, and prompted the micro hole crack formation and spread gradually, forming a new regeneration fracture network, the penetration of the channel to provide water in coal seam, so as to improve the mechanical properties, reduce the coal body in front of the working face of coal the stress, improve the gas emission speed, this method makes the coal seam pressure relief range, the overall pressure fully, fracturing influence area radius of up to 10~40m, and coal permeability The utility model has the advantages of simple method, easy operation and good effect, and can increase 100~1000 times.

【技术实现步骤摘要】

【技术保护点】
１．一种低透气性煤层脉冲压裂增透抽采瓦斯方法，其特征在于包括以下步骤：ａ．在煤层（３）巷道内沿煤层（３）顺层、高位巷（６）穿层或低位巷（７）穿层向压裂目标区域内分组依次实施压裂单元，首先施工一压裂孔（１），然后在距离压裂孔（１）的中心位置Ｌ为１０～２０ｍ的两侧处分别施工一个导向孔（２），三个钻孔构成一个压裂单元；ｂ．在进入压裂孔（１）深度为２０～３５ｍ的孔段内布置耐高压无缝钢管，深入孔中的耐高压无缝钢管头部０．５～１．５ｍ的管壁上均匀布有若干通孔；ｃ．用可承受３５ＭＰａ以上水压的封孔器对耐高压无缝钢管与压裂孔（１）之间的缝隙实施封孔，封孔器封孔长度为１０～１５ｍ；或者通过注浆泵向耐高压无缝钢管...

【技术特征摘要】

【专利技术属性】
技术研发人员：翟成，林柏泉，李贤忠，李全贵，张萌博，杨威，张超，
申请(专利权)人：中国矿业大学，
类型：发明
国别省市：32