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Puregold Gel
Puregold Gel is an 90 bbl yield unpeptized bentonite (sodium montmorillonite). Puregold Gel is certified to NSF/ANSI Standard 60 by NSF International. It has the unusual property of expanding several times its original volume when placed in water. The result is higher fluid viscosity, gel strength, and solids suspending ability.
Bentonite can be added up to 20% by volume by weight of cement. Above 6%, the addition of a dispersant is usually necessary to reduce the slurry viscosity and gel strength.
As shown in the table under Application, the slurry density decreases and the yield increases quickly with bentonite concentrations. High bentonite concentrations tend to improve fluid loss control; however the compromise is higher cement permeability and lower compressive strength. Puregold Gel can also be used as an extender at elevated temperatures.
Application
Bentonite % |
Slurry Weight kg/m³ |
Mix Water m³/ton |
Slurry Yield m³/ton |
0 | 1893.3 | 0.440 | 0.757 |
2 | 1785.4 | 0.547 | 0.870 |
4 | 1713.5 | 0.653 | 0.984 |
6 | 1665.6 | 0.759 | 1.097 |
8 | 1593.7 | 0.867 | 1.218 |
10 | 1569.7 | 0.971 | 1.323 |
12 | 1521.8 | 1.078 | 1.440 |
16 | 1461.9 | 1.291 | 1.880 |
Mixing & Handling
The extending properties of bentonite can be greatly enhanced if the material is allowed to completely hydrate in the mix water prior to slurry mixing. The presence of high concentrations of calcium ion in the aqueous phase of cement slurry inhibits the hydration of Puregold Gel.
Physical Properties
Specific Gravity: 2.5 g/mL
Bulk Density Non-Compacted: 53 lbs/ft³
Bulk Density Compacted: 72 lbs/ft³
200 Mesh Passing: 70% min
Chemical Properties
Moisture: 9.3%
Free Swell: 28 mL
Plate Water Absorption: 776.55%
Grit % (<75 micron): 3.0%