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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.

After several unsuccessful attempts using conventional lost circulation material (LCM) that contained up to 60 ppb of CaCO3 fine/medium and cellulosic materials in the active system, in addition to previous treatments with a competitor’s synthetic graphite, the operator decided to conduct additional analysis of the situation. The analyses involved using Baker Hughes, a GE company (BHGE), BRIDGEWISE™ engineering software and extensive lab tests using the BHGE MAX-BRIDGE™ advanced bridging solution.

Download the PDF to read the full case study.

Challenges & Results
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Challenges

  • Historically troublesome 12¼ in. section
  • Highly depleted formation
  • Wellbore instability
  • Unsuccessful attempts with several advanced LCM applications

Results

  • Downhole losses reduced from an average of 2,200 bbls per 12¼ in. section to zero losses
  • Reduced overall NPT by eliminating differential sticking and decreasing drilling torque
  • Wellbore stability increased by allowing higher fluids density up to 0.4 ppg