WF-1S Additive for Oilwell Cement (Acrylamide Type)

• Standards Basis: SY/T 5504.2–2013 (fluid-loss additives).

• Fineness (0.315 mm sieve residue, %): ≤ 15.

• API Fluid Loss (80 °C, 6.9 MPa), mL: ≤ 150.

• Initial Consistency (80 °C, 35 MPa, 40 min), Bc: ≤ 30.

• Thickening Linear Mutation Value, Bc: ≤ 10.

• Time from 40 Bc to 100 Bc (80 °C, 35 MPa, 40 min), min: ≤ 40.

• Free Water (80 °C, %): ≤ 1.4.

• Compressive Strength (100 °C, 20.7 MPa, 24 h), MPa: ≥ 14.

• Cement Slurry Composition: Class G cement, silica fume; Water: distilled.

Key Benefits

• Reduces API fluid loss without significantly increasing consistency, improving annular displacement and bond quality.

• Supports control of the 40–100 Bc transition time to preserve a safe pumpability window and thickening profile.

• Compatible with dispersants, retarders, defoamers, and other common additives for field optimization (project-specific testing required).