Abstract:

In order to reflect the relative space of the coal gas exploiting directional borehole line and coal or strata and optimize the borehole line design and enhance the accuracy in controlling, so the paper introduced the angle of penetration method. The paper built a model to calculate the angle of penetration and introduced the method to calculate the slice thickness of coal or strata. That the angle of penetration method was benefited to optimize the borehole line design and enhance the accuracy in controlling was concluded by an example.

Key words: the angle of penetration method, coal gas exploiting directional borehole, normal deviation, borehole trajectory