Vibration minimisation for continuous coring in Slim Hole Drilling
For Continuous Coring Slim Hole Drilling the basic geometry of the drilling system required to facilitate wireline retrieval of cores through the drillpipe provides much of the vibration minimisation.
The important vibration minimisation techniques of this system, which performs excellently in the hard rock mineral industry, are:
- Close annular clearance between the drill rods and the hole wall. This minimises lateral vibrations by restraining the displacement. The small annulus is considered to act as a hydrodynamic bearing so adding to the damping of lateral vibrations . . .