Down Hole Hammer Drilling
To drill a test or production bore hole in a safe and efficient manner and respecting the surrounding environment.
Prior to this method of drilling being utilised the site will have been prepared and a thorough safety check and risk assessment carried out. The rig will be mobilised to the drill target site. Final plumbing and centralising will be completed utilising hydraulic jacks and packing plates to ensure a secure base for the rig. When this has been achieved only then the mast will be erected and the final levelling will take place.
Drilling is attained by the use of a rotating drill head with the drill rods screwed into head. The drill string is that part of the drilling unit which works mainly within the borehole, connecting the surface drill Rig to the drill hammer & bit at the bottom of the drill string. In effect the main function of the drill string is the efficient transmission of power in the deepening hole. As required the drill pipes are mechanically lifted into place over the previous drilled pipe which is standing generally 1 mtr above surface and clamped in the drill table. The next pipe is then screwed into the last drill and torqued up. The Rig is ready to commence/continue drilling.
Down hole hammer technique
Down hole hammer is the process by mechanical & hydraulic motion which the "top drive head" is attached to the top end of drill string and through a combined process of an air operated piston within the hammer striking(percussion) the button bit attached to the bottom of the hammer, in addition to air and water and foam additive necessary to flush out the hole as drilling proceeds.
Discharge water and drill cuttings
Discharge water and drill cuttings will disperse around the protruding steel liner where the well is under construction at the back of the Rig. The water will run away with the fall of the site. Where appropriate procedures can be put in place to contain the water and dispose of it through surface pumping and or treatment across lay flat piping to an appropriate discharge point.