Unit of competency details

RIIWSV402D - Conduct well servicing milling operations (Release 2)


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Release Status:
ReleaseRelease date
(View details for release 3) 07/Dec/2014
2 (this release) 29/Jan/2014
(View details for release 1) 14/Nov/2013

Replaced release

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The current release is release 3View release 3 details.


SchemeCodeClassification value
ASCED Module/Unit of Competency Field of Education Identifier 030717 Plant And Machine Operations  

Classification history

SchemeCodeClassification valueStart dateEnd date
ASCED Module/Unit of Competency Field of Education Identifier 030717 Plant And Machine Operations  02/May/2014 
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Unit of competency

Modification History

Not applicable.


This unit describes a participant’s skills and knowledge required to conduct well servicing milling operations in Drilling.

This unit is appropriate for those working in supervisory or technical specialists roles.

Licensing, legislative, regulatory and certification requirements that may apply to this unit can vary between states, territories, and industry sectors. Relevant information must be sourced prior to application of the unit.

Unit Sector

  • Drilling (Well Servicing)

Elements and Performance Criteria

1 Plan and prepare for milling operations

1.1 Access, interpret and apply compliance documentation and legislation and ensure the work activity is compliant

1.2 Obtain, confirm and apply work instructions for the allocated task

1.3 Identify, manage and report all potential hazards

1.4 Communicate emergency response and occupational health and safety requirements, including the possibility of wellbore influx and well control, to crew members

1.5 Resolve and maintain coordination requirements with others at the site prior to commencing and during work activities

1.6 Check, clean and lubricate equipment, including -top drive and swivel connections and rectify and report faults

1.7 Check Bottom Hole Assembly (BHA) requirements and assembly

2 Commence milling operations

2.1 Check drilling program requirements to ensure safe operations

2.2 Undertake milling operations in accordance with the well program

2.3 Monitor, maintain and record milling parameters in line with program

2.4 Calculate and maintain hole volume and conditions requirements and carry out and record integrity tests in line with milling program

2.5 Maintain accurate tubular tallies

2.6 Inspect and prepare tubing running tools and tubulars for operation

3 Maintain milling operations

3.1 Undertake preparations, and give assistance in drill stem tests and logging operations

3.2 Put arrangements in place for nippling-up and milling out

4 Prepare hole for next stage of program

4.1 Confirm program for next stage with operator representative

4.2 Check tools/equipment for integrity and record and report faults

4.3 Complete appropriate communication and written recording requirements

Foundation Skills

Foundation skills essential to performance are explicit in the performance criteria of this unit. Further information is available in the Resources and Infrastructure Industry Training Package Companion Volume.

Unit Mapping Information

No equivalent unit


Companion Volume implementation guides are found in VETNet - https://vetnet.gov.au/Pages/TrainingDocs.aspx?q=88a61002-9a21-4386-aaf8-69c76e675272


Assessment requirements

Modification History

Not applicable.

Performance Evidence

Evidence is required to be collected that demonstrates a candidate’s competency in this unit. Evidence must be relevant to the roles within this sector’s work operations and satisfy all of the requirements of the performance criteria of this unit and include evidence that the candidate:

  • locates and applies relevant legislation, documentation, policies and procedures
  • works effectively with others to undertake and complete preparation for well servicing milling operations that meets all of the required outcomes including:
  • complying with written and verbal reporting requirements and procedures
  • communicating clearly and concisely with others to receive and clarify work instructions
  • communicating clearly and concisely with others to resolve coordination requirements throughout work activities
  • demonstrates the requirements, procedures and techniques for completing well servicing milling operations effectively and efficiently meet all of the required outcomes on a minimum of one (3) occasion including:
  • identifying and confirming Bottom Hole Assembly and drilling program requirements
  • carrying out milling operations
  • calculating hole volumes, maintain as per milling program requirements
  • preparing for nippling-up and milling out
  • inspecting tools and record faults
  • processing written records and reports

Knowledge Evidence

The candidate must demonstrate knowledge of conducting well servicing milling operations through:

  • accessing, interpreting and applying the organisation and site requirements and procedures
  • rig components
  • rig specifications
  • hole recovery procedures, including fishing, assembly service maintenance and tools
  • potential problems
  • down hole conditions
  • types of mud available
  • rigging and slinging
  • rig maintenance procedures
  • evacuation procedures
  • roles and responsibilities

Assessment Conditions

  • An assessor of this unit must satisfy the requirements of the NVR/AQTF or their successors; and Industry regulations for certification and licensing; and,
  • this unit is best assessed in the context of this sector’s work environment;
  • where personal safety or environmental damage are limiting factors, assessment may occur in a simulated environment provided it is realistic and sufficiently rigorous to cover all aspects of this sector’s workplace performance, including environment, task skills, task management skills, contingency management skills and job role environment skills; and,
  • this unit must be assessed using Resources and Infrastructure Industry sector specific policies, procedures, processes and operational manuals; and,
  • an assessor must demonstrate the performance evidence, and knowledge evidence as outlined in this Unit of Competency, and through five (5) years of work in the Industry sector; and,
  • where a co-assessment or partnership arrangement exists between a qualified assessor and an Industry technical expert, the Industry technical expert can hold the unit being assessed, and/or demonstrate equivalency of skills and knowledge at the unit level. An Industry technical expert must also demonstrate a minimum of three (3) years of continuous work in the Industry sector, with the preceding one (1) year in the unit they are co-assessing.


Companion Volume implementation guides are found in VETNet - https://vetnet.gov.au/Pages/TrainingDocs.aspx?q=88a61002-9a21-4386-aaf8-69c76e675272