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Suggested Operating Procedures for Water Base Mud Section

Situation Products lbs/bbl Pill Volume Sweep Frequency Notes
Preventive Sweeps MCT-1000™ 8 15-25 bbls 6-8 hours
  • Pump sweep every 6 to 8 hours, and additional as each potential problem sand is drilled
  • Drill 15' of sand—Pump 15 bbl sweep
  • Pump 15 bbl sweep at base of sand
  • Continue sweeps as long as under-balanced sands are exposed
  • Maintain pH above 9.5
Seepage Sweeps MCT-1000™ 10 25-50 bbls 4 hours or 100' of new hole drilled
  • Pump 25-50 bbls sweeps (calculated to cover 500' of hole)
  • Pump sweep every 4 hours or 100' of hole drilled
  • Adjust frequency for severity of problems
  • Continue sweeping program as long as under-balanced sands are exposed
  • Maintain pH above 9.5
Lost Circulation (Partial Returns) MCT-500™

MCT-1000™
15

15
50 bbls Pump sweeps as conditions dictate
  • Mix MCT-500™, then add MCT-1000™
  • Dilute with mud or water as required
  • Pump sweeps at reduced speed
  • Adjust concentration and frequency as conditions dictate
  • Spot pill in place should conditions worsen
Lost Circulation (Total Loss & Less Than 50% Returns) 8.8-11.0 ppb Mud
MCT-500™
MCT-1000™

11.1-14 ppg Mud
MCT-500™
MCT-1000™

14.1-17 ppg Mud
MCT-500™
MCT-1000™
40
Mix 28
Mix 12

30
Mix 21
Mix 9

25
Mix 17
Mix 10

50 bbls Spot pills

Follow up with sweeping program as required
  • Mix MCT-500™ first, then add MCT-1000™
  • Dilute with mud or water as required
  • Pump pill at reduced pump speed
  • Spot pill at suspected loss zone
  • POOH (or to last casing) Allow hole to heal
  • Stage in hole after regaining circulation
  • Establish regular sweeping program to TD
  • Heavier mud weights will limit and dictate amounts of fiber that can be added in the pill
  • Products recommendations are based on 70% MCT-500™ and 30% MCT-1000™ mixtures
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