Bentonite Mud
Bentonite based mud may be used to impart stability to boreholes through soft seabed sediments prior to running structural or conductor casing. 30-40ppb bentonite mud shall be used offshore to sweep top hole while drilling and to spot on bottom prior to running surface casing.
Bentonite Pre-hydration
1. Flush tank and lines with drill water.
2. Fill the surface tank to 75 %of capacity with drill water.
3. Check chloride concentration to ensure no sea water contamination. CHECK calcium and magnesium ion concentrations.
4. Add soda ash . . .