SITUATION

PRODUCTS

LBS/BBL

PILL VOLUME

SWEEP FREQUENCY

NOTES

PREVENTIVE SWEEPS  

MCT-1000

8 P.P.B.

15 – 25 bbls

6 – 8 hours

w         Pump sweep every 6 0 8 hours, and additional as each potential problem sand is drilled.

w         Drill 15’ of sand – Pump 15 bbl sweep.

w         Pump 15 bbl sweep at base of sand.

w         Continue sweeps as long as underblalaced sands are exposed.

SEEPAGE SWEEPS

MCT-1000

10 P.P.B.

25 – 50 bbls

4 hours or 100’ of new hole drilled

w         Pump 25 – 50 bbls sweeps (calculated to cover 500’ of hole).

w         Pump sweep every 4 hours or 100’ of hole drilled.

w         Adjust frequency for severity of problems.

w         Continue sweeping program as long as underbalanced sands are exposed.

w         Maintain pH above 9.5.

LOST CIRCULATION

“PARTIAL RETURNS”

MCT- 500

MCT-1000

15 P.P.B.

15 P.P.B.

50 bbls

Pump sweeps as conditions dictate

w         Mix DESI SEAL Medium first, then add the fine.

w         Dilute with mud or water as required.

w         Pump sweeps at reduced speed.

w         Adjust concentration and frequency as conditions dictate.

w         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-1000

40 PPB MIX      28 PPB 12 PPB

30 PPB MIX      21 PPB 9 PPB

25 PPB MIX      17 PPB 10 PPB

50 bbls

Spot pills

Follow up with sweeping program as required.

w         Mix Medium first, then add the fine.

w         Dilute with mud or water as required.

w         Pump pill at reduced pump speed.

w         Spot pill at suspected loss zone.

w         POOH (or to last casing) Allow hole to heal.

w         Stage in hole after regaining circulation.

w         Establish regular sweeping program to TD.

w         Heavier mud weights will limit and dictate amounts of fiber that can be added in the pill.

w         Products recommendation are based on 70% Medium and 30% Fine mixtures