Water drilling licence class 3
This is an unrestricted licence that permits drilling operations in flowing aquifers, including the Great Artesian Basin.
How to get a class 3 drilling licence
For a class 3 unrestricted drilling licence you must have drilling experience in the Great Artesian Basin or similar and have the same qualifications as a class 3 restricted licence.
Water drilling licence class 3 restricted
This is a restricted licence.
In addition to operating in class 2 conditions, class 3 permits drilling operations in flowing aquifer systems except in the Great Artesian Basin.
Artesian, flowing or high pressure, aquifers need a high level of knowledge and skills due to the driller's need to understand and control hydrostatic pressures.
There are two ways that you can be issued a class 3 restricted drilling licence.
The first is if you have held a class 2 licence or have been employed as a driller for at least two years, and you have completed at least six class 3 bores under supervision and passed the appropriate drilling licence examinations.
The second is if you have been issued a class 3 drilling licence to carry out bore construction work in another Australian state or territory and the qualifications and knowledge equal that needed for a class 3 drilling licence in the Northern Territory (NT).
Skills, experience and knowledge
As well as this you must be experienced in all of the following:
- drilling fluids - methods, procedures and calculations needed for formation fluid pressure control
- grouting - methods, procedures and calculations needed to carry out pressure cement jobs
- bore design in aquifer systems that have high pressure conditions and design of efficient bores, which includes being able to calculate screen surface areas and diameter
- aquifer testing - the procedures for a flow recession test, static and staged pumping tests on flowing bores
- decommissioning - designing and selecting the right materials for the decommissioning of bores having high pressure conditions.