In water wells, oil wells and foundation work, sodium bentonite is the base of drilling fluids. Its ability to swell and form stable suspensions solves several problems at once.
What does bentonite do in the well?
- Carries cuttings to the surface thanks to its viscosity.
- Keeps cuttings suspended when circulation stops (thixotropy), so the tool does not get stuck.
- Builds a thin filter cake on the walls that reduces fluid loss and stabilizes the hole.
- Cools and lubricates the bit, extending tool life.
200 mesh and API grade: what do they mean?
200 mesh means the powder passes a 74 micron sieve: a fineness that allows fast hydration and an even mix. API grade refers to bentonite that meets American Petroleum Institute specifications for drilling fluids, the standard for oil wells.
Bentomex drilling products
- Probento 1000: 200 mesh sodium bentonite for drilling and construction. 25 kg bag and 1,000 kg big bag.
- API grade sodium bentonite: for oil wells. 50 lb (22.63 kg) bag and 1,000 kg big bag.
Good practices when mixing mud
- Use the freshest water available: salt and hardness reduce swelling.
- Add bentonite gradually with constant agitation to avoid lumps.
- Let the mud hydrate before use; viscosity increases over time.
- Check viscosity and density regularly and adjust the dosage to the formation.
The exact dosage depends on diameter, depth and soil type. Tell us about your project and we will recommend the right product and packaging.
In construction
The same sodium bentonite is used in diaphragm walls, piles, trenches and the waterproofing of dams and ponds, where its sealing capacity is key to holding water and stabilizing excavations.
Frequently asked questions
How much bentonite do I need per cubic meter of mud?
It depends on the drilling type and soil. It is adjusted until the target viscosity is reached; our team can help you calculate it for your project.
Can API grade bentonite be used for water wells?
Yes. Although designed for oil wells, it also performs well in water well drilling.
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