Complex Strata Solution
A compound mix design for saline, hot-humid and interbedded ground, keeping long-circulation slurry performance stable.
Solution overview
- Application methods
- 非开挖管线施工 / 钻探与钻井施工
- Problem type
- Strata
Scenario and construction challenges
Alternating saline groundwater and hot-humid interbedded ground: polymers degrade and bentonite yield drops, so compound formulations are needed to hold performance.
Challenge 1Salt degradation
Saline groundwater degrades polymers and kills viscosity, collapsing slurry performance.
Challenge 2Heat loss
Evaporation and fluid loss accelerate in hot, humid conditions, making the hole level hard to keep.
Challenge 3Unstable indices
Interbedded ground swings slurry indices widely — continuous testing and tuning are required.
Complete solution
Each scheme pairs materials with dosing; the table below lists material, role and ratio per step.
| Stage | Material | Function | Ratio / dosage | Working condition | Scope |
|---|---|---|---|---|---|
| Base slurry | BENT-N sodium bentonite | Salt-tolerant base | 6%–8% | Saline groundwater, Cl⁻ ≤5000 mg/L | Salt-tolerant base slurry |
| Salt resistance | HDS-9 SeaShield | Anti-degradation | 0.5%–0.8% | Salinity ≤35‰, temperature ≤60 °C | Seawater or saline strata |
| Rheology | CMC-N | Viscosify & control loss | 0.3%–0.5% | Hot, humid conditions with rising fluid loss | Circulation rheology stability |
| Maintain | Compound top-up | Condition by test results | As required | Slurry indices fluctuating | Adjusted from shift test results |
Delivered results
Construction schematic & site photos
Use the schematic and site photos to follow the process and slurry flow; final parameters follow on-site trial results.
Construction schematic
Site photos
Related cases
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