松软煤层穿层孔挠性钻具强造斜机理与过程研究

Study on Mechanism and Process of Strong Deflecting of Flexible Drilling Tools in Through Beds Hole of Soft Coal Seam

摘要:

增加松软煤层穿层孔煤孔段的长度可以提高穿层孔单孔瓦斯抽采效果，利用挠性钻具组合施工煤孔段可以达到延长煤孔段的目的。本文建立了挠性钻具施工的力学模型，研究了强造斜的运动学特征，并提出了造斜过程的运动学曲线；根据力学模型及运动学特征，研究了强造斜钻进工艺，尽可能增加钻孔煤层钻遇率。

关键词:松软煤层;穿层孔;挠性钻具;造斜;瓦斯抽排

Abstract:

Increasing the length of coal-bearing interval of through beds hole in soft coal seam coal can improve gas drainage effect of single hole, which can be realized by using the flexible drilling assembly. This paper presents the mechanical model of flexible drilling tools construction, makes the studies on the kinematics characteristics of strong deflection and puts forward the kinematics curve. According to the above, the strong deflecting drilling technology is researched to increase drilling rate in coal seam as far as possible.

Key words:soft coal seam; through beds hole; flexible drilling; deflecting; gas drainage