Point out that the horizontal structure stress is one of the important influence factors on the coal seam floor's failure.
提出水平构造应力是煤层底板变形破坏不可忽略的重要因素之一。
As one of radial horizontal drilling techniques, high pressure water jet drilling technology is capable of using mechanical or water jet apparatus to make a cavity at the selected coal seam.
高压水射流径向水平孔钻进技术是水平孔施工技术之一，它是在垂直瓦斯抽放或煤层气勘探钻孔布置机械或水力扩孔装置，对准选定的煤层部位进行扩孔。
Making use of horizontal pinnate branch well to develop and utilize coal seam gas, is a new drilling technique, which is different from horizontal drilling and has its own uniqueness.
利用水平羽状分支井来开发利用煤层气，是一项新的钻探技术，它有别水平钻井，有其独特性。
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