1920 X 1080 CVF For Landing
1920 X 1080 CVF For Landing

Well Miller® CVF

Continuous Variable Force


Well Miller® CVF – Continuous Variable Force – is a comprehensive and dynamic system engineered to fully optimize hardware milling operations.

Utilizing multiple parameters measured throughout the milling process in real-time (including direct measurements of weight on bit, and rate of penetration), the CVF system produces levels of control, precision, and accuracy inspired by our manufacturing expertise, blurring the lines between milling and downhole CNC machining.

Case highlight

Since late 2019, an IOC had faced a highly challenging situation offshore of Congo, where the necessary replacement of a subsea Christmas tree was being prevented by a gate valve that was stuck in ...

Read case

Introducing the new Well Miller CVF

  • Optimizes hardware milling operations
  • Dynamic weight on bit with up to 5,000 lbs of force, in increments of 100 lbs 
  • Fast and efficient well repair
  • Remove faulty or obsolete hardware of all types


Born out of proven mechanical and clean-out services with an extensive track record, the Well Miller® CVF system is an integration of key features and benefits of several technologies, enhanced by multiple data measures for detailed Surface Readout (SRO) capability.

Up to 5,000 lbs of force is dynamically delivered to the mill bit in increments of 100 lbs under full surface control. The active CVF system provides fully optimized operations, minimizes required milling time, and provides flexibility to the entire milling operation in relation to changes in geometry, and material of the objective.

WM CVF Horizontal


  • Nipple profile milling
  • Access through failed valves (e.g. isolation/gate)
  • Enlargement of buckled tubing
  • Plug removal
  • Glass plug milling


  • Passive fail-safe system
  • Surface read-out compatible
  • Modular and configurable
  • Universal: operates on any e-line via DC
  • NACE compliant


  • Various bits based on objective
  • Large range of IDs accessible
  • No additional fluids required
  • Can be utilized on all downhole hardware materials
  • Accurate depth control

Specification range*

Tool OD 3 1/4
Length 28 ft
Weight in air 430 lbs
Min. completion ID 3.37"
Max. well pressure 20,000 psi
Max. well temperature 302 F
Tensile strength 94,000 lbs
Compressive strength 138,700 lbs
* Dependent upon configuration