低透气性煤层致裂增透技术应用与展望

发布时间：2018-04-10 03:26

本文选题：煤层气　切入点：低透气性煤层　出处：《煤炭科学技术》2017年06期

【摘要】：为了实现煤层气的工业化利用,分析了三维高压旋转水射流扩孔煤层增透技术、定向分段水力压裂增透技术、高压空气爆破致裂煤层技术的增透效果,应用上述煤层致裂增透新技术后,煤层气抽采量明显增加。高压水通过三维旋转钻头对煤体快速切割迅速破坏煤体,实现对影响区域内煤层气的快速释放;特制封孔器将压裂孔分割为数段,增大压裂面积的同时最大限度地利用高压水能,大幅增加了煤层气的逸出通道;经过加压的高压空气可实现对目标钻孔的连续爆破,大幅增加了煤层的煤层气的逸出通道,经济成本低。由于物理破坏增透方式存在着能量损失大、裂纹扩展方向有一定的随机性、预期方向有一定的偏差等问题,提出研发能溶解部分煤基质溶剂结合物理破坏方式以增加煤层的透气性。
[Abstract]:In order to realize the industrialization of coal-bed methane utilization, the paper analyzes the high-pressure rotating water jet hole coal seam permeability, piecewise directional hydraulic fracturing increased permeability, antireflective effect of high pressure air blasting technology of coal seam, the coal seam fracturing technology to improve permeability, increased the drainage amount of coalbed gas. High pressure water through the three-dimensional rotary drill bits of coal rapid cutting rapid destruction of coal, to achieve rapid release effect on coalbed gas in the region; special hole packer fracturing hole divided into several sections, enlarging the fracturing area while maximizing the use of high-pressure water, a substantial increase in the escape channel of coalbed gas; after high pressure air pressure can achieve continuous the target of drilling blasting, a substantial increase in the escape channel of coalbed, low cost. Because of the physical damage antireflection way has great energy loss and crack propagation direction have a certain In order to increase the permeability of coal seam, it is proposed to solve the problem of a certain deviation in the expected direction, which can dissolve part of the coal matrix solvent and combine the physical destruction mode.

【作者单位】：辽宁工程技术大学安全科学与工程学院;煤科集团沈阳研究院有限公司;煤矿安全技术国家重点实验室;
【基金】：国家科技重大专项资助项目(2016ZX05045-004) 中国煤炭科工集团有限公司科技创新基金资助项目(2014QN003)
【分类号】：TD712.62

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