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An operator challenged by unstable shale intervals and subsequent cementing issues in an offshore Norwegian field needed a more efficient way to ream the pilot hole and improve casing operations.

Baker Hughes, a GE company (BHGE), recommended its new GaugePro™ Echo digital on-command reamer. The reamer, with its near-bit placement feature and unlimited digital activation cycles, eliminates a reaming trip by drilling the rathole within a short distance of total depth (TD). The tool operates independently of pump flow rates and sends back real-time information including blade status and position, hydraulic oil pressure, temperature, and vibration, and includes a triple failsafe system to ensure it can trip out of hole. When used with an AutoTrak™ rotary steerable system bottomhole assembly (BHA), up to three reamers can be added and individually activated to provide flexibility while maintaining directional control in challenging formations.

Download the PDF to read the full case study.

Challenges & Results


  • Unstable formation in 12-¼ in. section mitigated by under reaming to 14-½ in.
  • Cement and hole stability issues in longer ratholes, requiring a rathole distance of less than 33 ft (10 m)


  • Reduced rathole by 84% from 164 ft (50 m) to 26 ft (8 m)
  • Eliminated a dedicated under-reamer run
  • Saved an estimated 25 hours rig time and $350,000 USD