BENT-N Sodium BentoniteNPT-BENT-N
Selected natural sodium bentonite with high montmorillonite content — high yield and low fluid loss make it the base for all engineered slurries.
Product Overview
One-liner: The base material for engineered slurry, Selected natural sodium bentonite with high montmorillonite content — high yield and low fluid loss make it the base for all engineered slurries.
BENT-N is selected natural sodium bentonite with high montmorillonite content and swelling capacity. The hydrated slurry forms a tight, low-loss filter cake. Use it alone or compounded with the PAM polymer series for sand, pebble and rock wall protection.
High yield
Montmorillonite content ≥ 75% gives more slurry per tonne.
Low fluid loss
A tight filter cake keeps fluid loss at ≤ 15 mL.
Good compatibility
Stable and complementary when compounded with the polymer series.
Applicable Strata / Scenarios
| Strata type | Typical scenario | Recommended ratio | Expected effect |
|---|---|---|---|
| Sand | Base slurry | 8%–10% slurry | Tight cake, stable wall |
| Pebble | Compound make-up | 6%–8% | Higher cuttings carry |
| Rock | Circulating slurry adjustment | 4%–6% | Lower fluid loss |
| Complex ground | With polymer series | As required | Complementary performance |
Technical Data Sheet
Quantified core indices for product selection and tender comparison; a test report ships with every batch.
| Test item | Specification | Test method |
|---|---|---|
| Montmorillonite content | ≥ 75% | Methylene blue |
| Swelling index | ≥ 15 mL/2g | Swelling index test |
| Fluid loss | ≤ 15 mL | API filter press |
| Moisture | ≤ 12.0% | Oven drying |
| Fineness (200 mesh pass) | ≥ 95% | Sieving |
| Yield point / PV ratio | Adjustable by compounding | 6-speed viscometer |
How to Use / Mix Design
| Step | Key points | Reference dosage |
|---|---|---|
| Make-up | Dose bentonite toward the target slurry density | 8%–10% (by mass) |
| Hydrate | Stir for 2–4 hours for full hydration and swelling | — |
| Compound | Combine with PAM-S / PAM-P as needed | As required |
| Maintain | Check fluid loss and sand content regularly | Once per shift |
Related Solutions
01Sand Strata Construction Solution
A full material and process package from mix design to loss control, holding surface settlement under 3 mm in water-rich sand.
02Pebble Strata Construction Solution
High-carry mix designs and hole-control measures for the large cuttings and unstable walls of pebble strata.
03Complex Strata Solution
A compound mix design for saline, hot-humid and interbedded ground, keeping long-circulation slurry performance stable.
04Slurry Loss Emergency Response Plan
An emergency response flow for sudden slurry loss and collapse warning signs — plugged within 2 hours and back to work fast.
05Rotary Drilling Rig Support Package
A slurry parameter package matched to rig model and bucket conditions — 22% faster hole completion per pile.
Related Cases
East · Metro / shieldWater-rich sand cross passage: 3 mm settlement, 6 days ahead
A metro cross passage in East China crossed water-rich fine silty sand. With high permeability, plain bentonite slurry lost over 15 L/min; the failed wall triggered surface settlement and a 5-day stoppage on a schedule-critical section.
Project scaleOne metro cross passage on the line's critical path, beneath a city road
Southwest · Bridge pilesPile drilling through pebble strata: 100% hole acceptance
Main-pier piles of a major bridge in Southwest China crossed deep pebble beds with stones over 800 mm. Φ1500 holes shrank to Φ1380, blocking cage installation, and bottom sediment ran thick — more than 4 clean-out passes per pile.
Project scaleMain-pier piles at Φ1500 mm through pebbles over 800 mm
Overseas · Port worksSeawater-ground slurry flocculation: 28% less bentonite
An overseas port project mixed slurry with seawater at about 32‰. Conventional mud flocculated out in the salt and could not form a film on the wall; bentonite consumption was high and remote resupply pushed costs up.
Project scaleOverseas port piles mixed with seawater at about 32‰ salinity
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