What are the differences between horizontal directional drilling rigs and trenchless drilling rigs

The horizontal directional drilling rig should be drilled in parallel. For example, if you want to bury pipelines when crossing the road, you cannot dig the road. The rotary digging is vertical downward, and you can also drill slightly inclined holes, such as various bridge piers and so on.

The working principle of trenchless drilling rigs, although the drill pipe is hard, it will bend after reaching a certain length. Determined by the toughness of the steel, the drilling rig additionally needs bentonite mud to lubricate to transport the mud and other debris drilled down, and to protect the drilled hole wall from collapsing.

When the horizontal directional drilling rig enters the construction, it will have a certain disturbance effect on the soft soil layer, but when the drilling rig is drilling, due to the penetration of the solid wall mud and the effect of the bonding and wall-building performance, the soil structure around the crossing pipeline will be impossible to appear. At the same time, due to the solid wall stabilizing effect of the mud, a mud skin is formed around the crossing well wall, and the solid wall stabilizing the mud skin will greatly reduce the permeability of the crossing space. In addition, the clay particles in the cutting cuttings and the mud itself will also be squeezed into the formation voids around the annulus, thereby enhancing the compactness of the annular formation, and thus the impact of drilling construction on the disturbance of the soft soil layer. will be eliminated by points, and will have less effect on hard rock layers.

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