Sodium Bicarbonate has a formula NaHCO3.
Molecular weight is 84.
Sodium Bicarbonate is used primarily to
remove calcium from muds with pH above 9.0, especially calcium contamination
due to cement.
Ca(OH)2 + NaHCO3-> CaCO3 + H2O + NaOH
Calcium contamination from anhydrate, CaSO4
should be removed with Soda Ash if a simultaneous reduction in pH is not
Pretreatment of cement contamination should
be not more than 1.4 – 2.1 kg/m3 (0.5 – 0.75 lb/bbl) of Sodium
Bicarbonate. Over-treatment can be as detrimental to fluids properties as
cement contamination. It is therefore advisable to treat only soluble calcium
ion on a circulation basis and treat lime particles (cement) that subsequently
go into solution. Approximately 0.42 kg/m3 (0.147 lb/bbl) NaHCO3
will remove 100 mg/l calcium originating from lime.
TYPICAL PHYSICAL PROPERTIES
pH (saturated solution @ 250C)6.8
SAFE HANDLING RECOMMENDATIONS
Utilize normal precaution for employee
protection when handling chemical products.
Use of appropriate respirator gloves,
goggles and apron is recommended for employee comfort and protection.
Sodium Bicarbonate does not have a
restricted classification for transportation by the international or domestic
Sodium Bicarbonate is packaged in 50 kg