| Situation |
Products |
lbs/bbl |
Pill Volume |
Sweep Frequency |
Notes |
| Preventive Sweeps |
MCT-500™
MCT-1000™ |
7 |
15-25 bbls |
6-8 hours |
- Dilute with diesel or mud as required
- Pump sweep every 6 to 8 hours, and additional as each potential problem sand is drilled
- Continue sweeps as log as under-balanced sands are exposed
- Add wetting agent per mud company representative directions
|
| Seepage Sweeps |
MCT-500™
MCT-1000™ |
5
10 |
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™ |
20
16 |
50 bbls |
Pump sweeps as conditions dictate
2 to 3 sweeps may be required to control losses |
- 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) |
MCT-500™
MCT-1000™
|
32
13
|
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
|