Gypsum.
PRODUCT DESCRIPTION.
Gypsum or gyp, is the common name for calcium sulfate (CaSO4●2H2O) and is the source of calcium ions used to prepare gyp muds. Gypsum is also used to remove carbonate contamination in high-pH muds.
Applications.
- Gypsum is used in gypsum/lignosulfonate or polymer muds as a source of calcium ions for inhibition and to convert bentonite to the calcium-ion form. This avoids problems that might otherwise occur when drilling anhydrite.
Recommended Treatment.
Gypsum or gyp, is the common name for calcium sulfate (CaSO4●2H2O) and is the source of calcium ions used to prepare gyp muds. Gypsum is also used to remove carbonate contamination in high-pH muds.
For gypsum/lignosulfonate muds, add Gypsum until the calcium-ion concentration in the filtrate is be-tween 600 and 1,200 mg/L. Usually 4 to 8 lb/bbl is needed for the initial break over. For polymer muds, a treatment of 2 to 4 lb/bbl normally supplies sufficient free calcium ions to inhibit clay dispersion.
For carbonate contamination the theoretical Gypsum treatments is:
Fw x 0.001 x mg/L carbonate (lb/bbl)
In practice, larger treatments than this are normally needed because of the interaction of Gypsum with other mud components. Gypsum should be pre-solubilized and added slowly over several circulations to avoid undesirable viscosity increase.
Additional Product Info.
For more information about Gypsum, please contact us.
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- D Terg (Drilling Detergent)
- Gypsum (Gypsum)
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- SAPP (Sodium Acid Pyro Phosphate)
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- Sodium Bicarbonate (Sodium Bicarbonate)
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