WS-2S Dispersant for Oilwell Cement (Polycarboxylate Type)

• Standards Basis: SY/T 6545–2017 (dispersants for oilwell cement).

• Fineness (0.315 mm sieve residue, %): ≤ 5.

• Fluidity (80 °C, 35 MPa, 30 min), mm: ≥ 230.

• Free Water (80 °C, %): ≤ 1.4.

• Compressive Strength (80 °C, 20.7 MPa, 24 h), MPa: ≥ 14.

• Cement Slurry Composition: Class G (HSR) cement; Water: distilled.

Key Benefits

• Electro‑steric dispersion lowers plastic viscosity and yield stress while sustaining fluidity at elevated temperatures.

• Reduces water demand and friction pressure, improving pumpability and placement efficiency.

• Good compatibility with fluid‑loss additives, retarders, stabilizers, and defoamers for balanced rheology and thickening control.

• Salt and temperature tolerance suitable for common HP/HT cementing windows (to be validated by project‑specific testing).

Formulation Notes

• Dosage: express as %BWOC (typical screening 0.10–0.80%). Calibrate for density, temperature, and water–cement ratio.

• Water Quality Sensitivity: verify performance with make‑up water salinity/mineralization; adjust dosage accordingly.

• Additive Interactions: optimize with retarders and fluid‑loss agents to maintain initial consistency and thickening linear mutation control.

• Mixing Order: disperse in mix water or as pre‑blend per lab protocol to ensure consistent rheology and minimal entrained air.