• Historically troublesome 12 1⁄4-in. section
  • Highly depleted formation
  • Wellbore instability
  • Unsuccessful attempts with several LCM applications
  • Reduced downhole losses from an average of 2,200 bbl per 12 1⁄4-in. section to zero losses
  • Decreased overall NPT by eliminating differential sticking and decreasing drilling torque
  • Increased wellbore stability by allowing higher fluids density up to 0.4 ppg

Case study details

In a mature field in East Kalimantan, Indonesia, an independent operator experienced massive losses in a
series of wells, along with wellbore instability-related problems. The extremely low pore pressure typically found in these types of mature fields is problematic because the low pressure requires having enough drilling fluid density to stabilize the wellbore.

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