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Below are some of the projects undertaken by Brown Bros (NZ) Ltd since 1937. The projects listed cover various drilling markets. Some of these contracts have been substantial and of high risk, and have included challenges that other drilling companies would not accept.
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Water bores
Location: Pukekohe
Client: The Market Gardeners
Project:These projects involved numerous high volume irrigation water bores for some of the most respected growers in the country.
Brown Bros (NZ) Ltd was chosen for our track record and ability to complete entire drilling programmes in-house. This is from the pilot hole and design, to drilling and construction followed by pump testing for resource consent.
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De-Watering, Injection, and Re-injection Bores
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Location: Auckland
Client: Winstone Aggregates
Project:Brown Bros (NZ) Ltd won this quarry de-watering bore tender due to lateral thinking and innovative drilling procedures. This saved valuable time and reduced end cost to the principal. The geology consisted of extremely broken basalt and loose scoria rock. Drilling and construction of the de-watering bore was completed using the Concentrix Overburden Casing System. The bore is producing good quality water in excess of 7000 m3/day
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Mining
HQTT wireline coal exploration
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Location: Waikato
Client: Glencoal Energy
Project:
In June 2003 Kelly Brown, drilling with the SIMCO 5000, successfully completed another coal exploration program for Glencoal Energy, a subsidiary of the Fonterra Co-operative Group.
Previous drilling in this area had encountered disturbed coal seams in some of the boreholes, resulting in reduced core recovery. To overcome this problem Brown Bros (NZ) Ltd drew on their experience in coal drilling and designed a coal coring bit specifically for obtaining core recovery in the disturbed coal seams. Consequently good core recovery was obtained for what was the first time in this area.
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Location: Taharoa and North Head
Client: BHP
Project:Brown Bros (NZ) Ltd successfully completed numerous Reverse Circulation iron sand-sampling programmes. Undertaken on the harsh West Coast sand dunes and coastal forest, this project required specialised all-terrain mounted drill rigs and support vehicles.
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Quarry
Location: North Island Sites
Client: Winstone Aggregates Ltd
Project:These projects involved a range of activities from quarry exploration to monitoring wells. There was also the implementation of water bores for crushing plant and dust suppression at multiple quarry sites employing specialised hard rock drilling equipment.
Drilling systems included: Reverse Circulation, HQ & PQ coring and Concentrix Overburden Casing Systems.
Brown Bros (NZ) Ltd is proud to have been working with Winstone Aggregates for over 30 years.
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Geotechnical
Plugging and abandoning oil wells
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Location: Waikato River
Client:
Project:
The proposed Genesis Power Station upgrade at Huntly, in the North Island of New Zealand, requires large items of prefabricated equipment to cross the river from Huntly town to the Power Station, on the West Side of the river.
Brown Bros (NZ) Ltd conducted a geotechnical investigation in 2002 to provide foundation material data for the bridge upgrade at both the existing Rail and Road Bridge.
Brown Bros (NZ) Ltd completed the original Huntly Rail Bridge for NZ Rail, with a preliminary investigation in 1952 and a more detailed investigation in 1964.
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Deep instrumentation holes - Waihi
Location: Waihi
Client:
Project: Following the recently highlighted Sink Holes in Waihi, Brown Bros (NZ) Ltd completed two separate projects utilising the UDR 650 MK11. Both PQ and HQ diamond coring techniques were employed to take sample core depths of 250 metres. Sensitive monitor equipment was also installed.
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Location: Auckland
Client: City Design
Project:This project, on Auckland's north-western motorway and surrounding suburbs, included intensive HQTT Wireline Coring, SPTs and Shear Vane testing on a proposed large diameter stormwater pipe-jacking route.
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Environmental
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Location: New Plymouth
Client: Dow AgroSciences (NZ) Limited
Project: Intensive multi-hole Hollow Stem Auger soil sampling programme, for the installation of 50mm diameter monitoring wells. The project also included monitoring well development, slug testing, and descriptive soil logging completed by Browns.
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Oil, Gas and Geothermal
Plugging and abandoning oil wells
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Location: New Plymouth
Client:
Project:
The much publicised leaking oil wells in residential New Plymouth have finally been plugged. Brown Bros (NZ) Ltd successfully completed the project in May 2003 under stringent petroleum requirements and those set by local authority when working in a residential address.
Drilling for oil in New Plymouth dates back over 100 years and many of the oil wells were abandoned.
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Location: New Plymouth
Client: Petroleum Ltd
Project:This project involved the re-entering and rehabilitation of an old oil well "Motoura #2" on New Plymouth's foreshore.
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Specialty Projects
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Location: Huntly
Client: ECNZ and USA Joint Venture
Project:This was an Underground Coal Gasification (UCG) project for the mining of deep coal beds, utilising leading edge Technology. This was the second Underground Coal Gasification project completed world wide.
The project was a full module 'test burn' and the drilling program required sound technical input in close association with the joint venture partners. Drilled on large diameters to 320 metres each, this project also included monitor wells and the test burning of underground coal.
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Horizontal
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Location: Waihi
Client: Coeur Golden Cross
Project:Brown Bros (NZ) Ltd drilled close to 6000 metres of horizontal drainage holes to relieve water pressure, de-water and stabilise the mine site, and surrounding steep topography. Holes were drilled through extremely difficult geology to 250 metres length and installed with 50mm drainage pipe.
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Overseas Contracts
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Location: Fiji
Client: Local Port Authorities
Project:Brown Bros (NZ) Ltd were awarded the Geotechnical investigation for the Rokobuli and Muiawalu Suva wharf extension in 1997. This involved intensive barge based Geotechnical sampling, including HQTT coring and SPTs.
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