An ordinary horizontal well consists of vertical section, curve section and horizontal section.
普通水平井轨迹由三部分组成:直井段, 造斜段,水平段.
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The horizontal section top coal caving in steep seam is different from the gently inclined seam.
急斜煤层水平分段放顶煤开采与缓斜煤层不同,工作面沿煤层厚度的水平线布置,长度短.
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