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文内指出,传统的水力压裂方法效果不理想,因为在这样的压裂过程中,张开的仅仅是煤层主裂隙,不能使煤体得到均匀地处理。而利用液氮的水力压裂技术,可以借助在孔底工作面区冻结已压开的主裂隙网,使继续压裂时压开次裂隙,以达到均匀处理和加速煤体裂隙系统的张开过程。注氮工艺是:用 AΓY—8K 型汽化装置。由于注入氮气,使煤层内造成再次压裂前的气垫。也就是由于“气泡效应”而使煤层对瓦斯的渗透性加大。
The article points out that the traditional hydraulic fracturing method is not effective, because in such a fracturing process, the only open the main seam of the coal seam, can not be uniformly treated coal. The use of liquid nitrogen hydraulic fracturing technology, you can by the bottom of the hole at the face of the frozen zone has been open the main fracture network, the continued fracturing times open the secondary cracks in order to achieve uniform treatment and speed up the expansion of coal cracks system process. Nitrogen injection process is: with AΓY-8K-type vaporization device. Due to the injection of nitrogen gas, the gas cushion in the coal seam will be fractured again before fracturing. That is because of the “bubble effect” and make the permeability of coal seam increased.