Lignosulfonate Cement Setting Retarder
Calcium or sodium lignosulfonate is a widely used cement retarder in oil well cementing operations that extends the thickening time of Portland cement slurries to allow safe placement in deep, hot, or long casing strings. It is effective over a temperature range of 60–150°C at dosages of 0.1–0.5% by weight of cement (BWOC). Lignosulfonate retarders are cost-effective and compatible with most fluid loss agents and dispersants used in oilfield cementing.
Technical Specifications
| appearance | Brown to dark brown powder or liquid |
| pH (1% solution) | 4.0–7.0 |
| active content (%) | ≥90 (powder), ≥40 (liquid) |
| compatible API class | A, C, G, H |
| thickening time extension at 80°C (min/0.3% BWOC) | ≥60 |
Applications
- Deep well and high-temperature cement slurry retardation
- Long casing string cementing operations
- Liner cementing in HPHT wells
- Geothermal well cementing
- Extending workable life of cement slurries in hot climates
Key Features
- Reliable and predictable retardation in API G and H cements
- Broad temperature range (60–150°C) effectiveness
- Compatible with fluid loss agents, dispersants, and gas block agents
- Cost-effective natural byproduct with consistent performance
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