A coefficient of friction in HDD boreholes

The author will discuss the phenomenon of friction between the elements od drilling conduit and borehole wall which in the case of horizontal directional drilling occurs on the full length of the borehole. The methods of calculating the friction and the impact this phenomenon has on the drilling of the boreholes will be also presented, as well as the solutions for reducing the coefficient of friction.

Krzysztof Czudec, HEADS sp. z o.o.