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Potassium Humate
1. Introduction
Potassium humate used for drilling fluid is the product after the potassium hydroxide generates chemical reaction with humic acid which is extracted from decomposed coal. It contains multiple functional groups, mainly including carboxyl, phenol carboxyl and quinonyl. Because the functional group of ortho bi-phenolic group can strongly adsorb with clay, together with strong hydration of carboxyl, the potassium humate not only has the water-loss reducing effect, but also has dilution effect. Meanwhile, due to the introduction of K ion, the characteristics of clay in mudstone and shale nearby the well wall can be changed, resulting in the appearance of better hydration sluggishness. Therefore, Potassium Humate has good anti-collapse effect. Moreover, the existence of anti-high temperature group in Potassium Humate shows a good temperature resistance property.
2. Technical Performance Index
| Item | Index |
| Appearance | Black brown powdery particle |
| Moisture | ≤10% |
| Matter insoluble in water (calculate by air-dry basis) | Not more than 10% |
| Humic acid (calculate by air-dry basis | ≥50% |
| Potassium (calculate by air-dry basis | ≥10% |
| PH value | 9-10 |
| Fineness (pass through 0.45mm screen) | 100% |
| Filter loss of fresh water drilling fluid (25℃/690Kpa) | Not increase the filter loss of original drilling fluid |
| Inhibitive index (expressed by relative swelling rate RSR) | Not more than 50% |
3. Application and Function
·Potassium humate Potassium Humate is mainly used for anti-collapse agent of shale of fresh water drilling fluid.
·Concurrently possess viscosity reduction and water-loss reducing effect.
·Temperature resistance can be up to 180℃.
·Non-poisonous, not pollute the environment, available to biological degradation.
4. Usage and Dosage
Directly add from the aggravated funnel, and recommended dosage is 1-3%.
5. Packaging: Use three-in-one plus one compound woven bag, net weight is 25Kg per bag.
