| 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
|