ProMILL™ Milling And Underreaming System

Effective foundation for an abandonment cement barrier

The industry-unique ProMILL system enables consistent savings during P&A operations by delivering in a single run what has typically taken four trips to accomplish.

The ProMILL system combines a bridge plug assembly, a section mill, and a high ratio underreamer to prepare the foundation for an abandonment cement barrier in a single run. During the run, it eradicates all leak paths from the abandonment barrier while achieving rock-to-rock zonal isolation.

Single Trip to Mill and Underream

Save rig time, improve ROP, and ensure plug integrity for confident P&A decisions.

All ProMILL system cutter arms are dressed with WavEdge* ridged milling elements that, along with the multiblade design, provides high ROP and maximizes footage. This unique milling element, designed with a concave pattern and narrow leading edge, has improved durability, stabilization, and results in superior hole cleaning and swarf quality.

The high-ratio underreamer features ball-drop activation, which ensures that the reamer remains inert during the entire milling operation. The section is underreamed and the operator achieves the target access, completing the operation.

Document Downloads
Red Baron Catalog
Pilot Mill_Brunei_APAC_Performance Bulletin
Patch Installation_ESSA_ N Sea Performance Bulletin
ProMILL 9.625Casing_ESSA_Norway Performance Bulletin
K Mill SectMill LAM_Colombia Performance Bulletin
ProMILL Duo_ESSA_N Germany_Performance Bulletin
ProMILL Duo 6000_MENA_Qatar Performance Bulletin
ProMILL Duo_APAC_Brunei Performance Bulletin
TruEdge_ESSA_NorthSea Performance Bulletin
TruEdge_ESSA_Netherlands Performance Bulletin
TruEdge Milling Cutting_Qatar_MENA Performance Bulletin
TruEdge Milling & Cutting in Qatar – Performance Bulletin
Villavicencio_Colombia Facility
Villavicencio Colombia Facility – SPN
TruEdge News Release RUS
ProMILL Duo Brunei Case Study
ProMILL Duo E Malaysia Case Study
Dunlin N Sea – ProMill – Technical Article
Casing Mill Factsheet
ProMILL Duo Factsheet
ProMILL Underreamer Factsheet
WIS ProMILL Duo News Release PRG
WIS ProMill Duo News Release SPN
TruEdge News Release
TruEdge News Release PRG
TruEdge News Release SPN
Well Abandonment Brochure
The system incorporates a bridge plug running kit that enables a mechanical plug to be set without prematurely activating the section mill or underreamer.

  • Enlarges wellbore sections beyond the original drilled hole size
  • Single trip BHA that can simultaneously mill a section and underreamed in a single run
  • Remains dormant during section milling operations with ball-drop activation when required
  • PDC cutter arms capable of underreaming variable formations
  • As part of the ProMILL* system, the ProMILL Underreamer reduces rig time by eliminating additional trips to underream after completing a section milled window


Anchoring of section sets inside

Hydraulically actuated pulling section

Compatible with any mechanical engagement
tool for engaging the fish
for pulling

Hydraulic set-and-release anchor section

1,200,000-lbf pulling capacity

Not limited to workstring limitations

Used with conventional fishing jarring BHAs