Table 4: Mud properties using calcium carbonate as the weighting material.

Mud Properties 0ppb 30ppb 60ppb 90ppb 120ppb
Mud Weight, ppg 8.7 9.1 9.4 10.2 10.7
Plastic Viscosity, cp 11 15 21 22 30
Yield Point, lb/100ft2 34 32 32 42 46
10 Second Gel, lb/100ft2 25 21 28 31 43
10 Min Gel, lb/100ft2 49 43 49 62 78
Yield Stress, lb/100ft2 11 10 18 19 26
600 RPM 56 62 74 86 106
300 RPM 45 47 53 64 76
200 RPM 39 42 47 51 65
100 RPM 28 30 34 39 43
6 RPM 19 20 26 29 38
3 RPM 15 15 22 24 32