Services

Drill Force use a number of different drilling methods. These drilling methods are selected and used with New Zealand’s unique geological nature and the purpose of the well being considered. During the drilling process a number methods may be required to meet the clients sampling and completion requirements. Please find below a list of alternative drilling methods;

Rotary wash drill

Open hole type drilling and sampling method using a fluid (water or oil based) flushing medium. With our onboard mud pumps and Drill Force owned "plug-in" auxiliary high volume pumps, Tri-cone roller type bits, Drag type bits and PDC bits we have the current capacity and equipment to rotary wash drill hole diameters in excess of 400mm for water well, exploration, production wells and instrumentation type wells

Rotary air blast (RAB)

Open hole type drilling and sampling method using air as the  flushing medium. With our onboard compressors and Drill Force owned "plug-in" auxiliary high pressure compressors, Tri-cone roller type bits, Drag type bits and PDC bits we have the current capacity, (dependant on ground conditions) and equipment to provide this drilling method

Down hole hammer (DTH)

Open hole type drilling and sampling method using an air driven down hole hammer and the exhausting air as the flushing medium. With our onboard compressors and Drill Force owned "plug-in" auxiliary high pressure compressors, DTH hammers and bit selection we have the capacity and equipment to drill from 4" to 12" holes

Reverse circulation (RC) Down Hole Hammer, Blade or Tri-cone roller

Typically a mineral sampling method using air as a flushing medium, where a representative sample is drawn through a duel tube type drill pipe back to surface.

Continuous and conventional wire line coring

Preferred drilling method where an "undisturbed" sample is required for further testing and analyses. With this drilling method, SPT, Push tube and Formation permeability testing can be undertaken during the drilling process without the requirement to withdraw the drill rods from the well. Typical size core samples are NQ @45mm, HQ @61.1mm and PQ @83mm. These core samples are retrieved by using a selection of drilling bits and core catcher configurations to suit the geology as it is intersected and changes throughout the drilling of the well.

Auger

Augers can be used to provide a bulk disturbed samples for environmental purposes and when using hollow stem augers can be used as temporary casing whilst installing instrumentation. Augers are also used to "open hole" large diameters prior to setting conductor casing.