RIINHB322E — Construct multiple aquifer production bores

Elements & performance criteria

Performance evidence

• construct multiple aquifer production bores on at least three occasions, including:
• planning and preparing for constructing multiple aquifer bores, including:
• selecting a bore site to prevent contamination and minimise interference with other bores
• selecting appropriate drilling method for planned geology in a multiple aquifer system (potential drilling methods include rotary air, rotary mud, sonic, cable tool and auger)
• designing a multiple aquifer bore to ensure the exclusion of unsuitable waters and to prevent the inter-mixing of aquifers with different water quality or Standing Water Levels
• constructing and developing multiple aquifer bores in line with established requirements, including:
• drilling and isolating target production zone
• identifying and logging strata encountered during drilling including aquifer and aquitard (confining layer) units
• confirming or amending bore design based on testing and encountered geology, using:
• sieve testing
• lithological logging
• geophysics testing
• aquifer yields testing
• water quality testing
• selecting likely water entry mechanism from the formation to the bore including stainless steel screens, filter packs, slotted casing and open-hole
• calculating and making up cement grout volumes and mixing grout component quantities, including:
• cement powder
• water
• bentonite
• other additives as required
• calculating hole and annular volumes
• calculating grout specific gravity
• determining appropriate screen and filter pack configuration, accounting for:
• formation grain size
• screen aperture
• annular space
• filter pack mineralogy, including quartz sand
• natural filter pack potential (formation)
• constructing bore according to confirmed or amended design, including:
• assembling and installing casings, seals and screens
• installing filter pack
• grouting
• sealing intermediate and/or production casing strings or seal selected zones to complete grouting operations
• continuing development until a continuous, clean supply of water is obtained
• estimating yield by using methodologies of:
• air lifting
• pumping
• disinfecting/decontaminating bore and drilling equipment in line with established requirements, including:
• disinfecting bores and installed equipment using proprietary chemical solution
• decommissioning bore holes in line with established requirements, including:
• decommissioning failed or unwanted bores as required.
• During the above, the candidate must:
• locate and apply required documentation, standards, policies and procedures
• select and wear personal protective equipment required for work activities
• maintain plumbness and alignment of the hole within limitations
• use a range of communication techniques and equipment essential to the safe completion of work activity, including hand, audible and other signals
• meet written and verbal reporting requirements and procedures associated with equipment operations.

Knowledge evidence

• key legislation required to construct multiple aquifer production bores
• key policies, procedures and established requirements for constructing multiple aquifer bores, including those for:
• Minimum Construction Requirements (MCR)
• workplace health and safety
• environmental practice
• accidents and emergencies
• safety data sheets (SDS)
• housekeeping
• key factors affecting multiple aquifer bore performance, including:
• properties, uses and effects of and differences between:
• single and multiple aquifers
• drilling fluids
• casings
• cement (grout) additives
• grout placement methods and procedures
• hole preparation for cementing (grouting) operations
• pressure cementing methods
• results of sieve analysis
• calculations for:
• up hole velocity
• specific gravity
• cement mixes
• screen design parameters
• flow rates (including L/sec and GPM)
• conversion from imperial to metric and vice versa
• equipment processes, technical capability and limitations
• casing strength and collapse characteristics
• applications for wire-wound screens
• screen design parameters to ensure appropriate entrance velocities
• types of pathogens and contaminants including bacteria.

Foundation skills

• Numeracy: Identifies and comprehends relevant mathematical information and formulae in relation to constructing multiple aquifer bores
• Writing: Produces and completes workplace reports, including maintenance schedules using appropriate vocabulary, grammatical structures and conventions

Unit content sourced from training.gov.au — © Commonwealth of Australia, licensed under CC BY 4.0. Auditori is not affiliated with the Department of Employment and Workplace Relations.

Questions about assessing RIINHB322E