Drilling – Maitai Pipeline

Close up of CW Drill doing cased holes using Casagrande C6 drill rig on Matai pipeline, New Zealand

Location
Maitai, Nelson

Client
Fulton Hogan.

Drilling Project Brief
Drilling and casing through compacted Fill into bedrock using a 300mm Tubex casing advancement system, installation of a bed of cathodic anodes to assist with the long term protection of the new pipeline being laid to supply water to Nelson city.
The holes were drilled with the casing system to target depth, drilling tools removed and the anodes installed inside the cased hole. As the casing is withdrawn the holes were filled with a fine crushed rock saturated with salt water to initiate the process.

Drilling Project Challenges
Very soft layer of topsoil. This involved having to negotiate a way to traverse it without causing excess damage.
Sand Flies.