Spec Sheet Precision Mechanical Applications

PRIME Milling

Part of the PRIME digital electro-hydraulic intervention technology platform.

Critical to optimized and efficient milling of wellbore completion components is the ability to provide the required milling parameters of torque, weight on bit (WOB) and RPM, combined with a specifically designed mill bit, in turn delivering optimized rate of penetration (ROP) throughout the task at hand.

Also critical is the ability to monitor, control and adjust these parameters throughout the milling exercise, to handle variations in component material, shape and dimensions, as well as the surrounding fluid changes and swarf build up.

The PRIME Direct Drive Rotation (DDR) is a highly instrumented, high torque rotational device with real-time in-well monitoring, control and adjustment capability.

Built on a common tool architecture, the PRIME DDR is seamlessly integrated with the PowerTrac® PRIME Tractor which, in addition to providing efficient conveyance of the milling toolstring to task depth, provides the required rotational anchor and the WOB control in deviated wells. On-the-fly adjustment of tractor force offers seamless adjustments to WOB allowing optimum milling parameters to be maintain throughout the operation.

Further efficiency gains come from active stall control recovery which vastly improves effective milling time. On-the-fly switching capability of the rotational anchor between free-wheeling (rolling) or tractor driven mode enables uninterrupted back reaming capability.




Tool body OD

2.5 in  (63.5 mm)

3.307 in  (84.00 mm)


7.78 ft  (2.37 m)

7.64 ft  (2.33 m)

Pressure rating

15,000 psi  (1,034 bar)

Temperature rating

177 °C  (350 °F)

The mill bits that are run in conjunction with the PowerTrac® PRIME Tractor and PRIME DDR string are designed specifically for the task to be carried out. They are generally customised to best manage the metallurgy and dimensions of the wellbore component being addressed, the environment in which it is situated i.e. wellbore deviation, surrounding fluid type, and the objective of the operation to be carried out, e.g. full or partial removal of the component to regain its functionality or solely to regain wellbore access following its malfunction. Milling direction is also a consideration, be that top down or bottom up, all of which can be managed by the dexterity of the PRIME Platform technology with high precision and control.

Examples of wellbore components requiring milling are nipples, valves, and plugs: 


The Release Sub System (RSS) has been developed to enable controlled release of stuck toolstrings. Multiple RSS’s can be utilized, placed at the top of the toolstring or at relevant positions along its length enabling partial retrieval. The PRIME RSS has integrated PRIME node electronics, enabling full PRIME communication and in-well functionality to PRIME tools positioned below, and in-hole configurability for release parameters. It also provides real-time release status based on sensor reading and battery life measurement.

RSS release is activated by telemetry commands, voltage variation or memory timer mode, enabling controlled release even with damaged cable.


  • Logging toolstrings in cased and open hole
  • Tractor conveyance and Powered Mechanical Applications


  • Release energized through wireline or battery
  • Extended battery life
  • High torque design enabling usage with milling applications
  • Real-time in-well configuration to adapt for changes in work scope


  • Can release even if cable is damaged
  • QHSE; reduces personnel exposure to cable breakage at surface due to high overpull
  • Improved operational efficiency; less runs, increased measurements per run
  • More efficient retrieval/fishing due to clean fishing neck after release


 RSS 212PRIME RSS 212RSS 318
Tool body OD

2.125 in  (54.00 mm)

2.5 in  (63.50 mm)

3.125 in  (79.38 mm)


3.41 ft  (1.04 m)

3.63 ft  (1.10 m)

3.9 ft  (1.19 m)

Min restriction ID

2.5 in  (63.50 mm)

2.625 in  (66.68 mm)

3.25 in  (82.55 mm)

Pressure rating

15,000 psi (1,034 bar)

Temperature rating

177 °C  (350 °F)

Fishing neck

1.38 in  (35.1 mm)

1.75 in  (44.5 mm)

1.75 in  (44.5 mm)


Deliver Precision
Demand Certainty.

Invervention Redefined


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