WT-1S Toughening & Permeability-Reducing Additive for Oilwell Cement

• Standards Basis: SY/T 5504.5–2022 (toughening materials).

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

• Initial Consistency (52 °C, 35.6 MPa, 28 min), Bc: ≤ 30.

• Thickening Linear Mutation Value, Bc: ≤ 10.

• Compressive Strength (70 °C, 20.7 MPa, 24 h), MPa: ≥ 14.

• Elastic Modulus (70 °C, 20.7 MPa, 48 h), GPa: ≤ 8.5.

• Permeability (70 °C, 20.7 MPa, 48 h), 10⁻³ μm²: ≤ 0.1.

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

Key Benefits

• Polymer latex powder introduces an elastic phase and pore‑blocking domains, decreasing elastic modulus while lowering permeability.

• Improves casing–sheath bonding and resistance to microannulus formation under thermal cycling and pressure fluctuations.

• Maintains initial consistency and thickening control (≤30/≤10 Bc), supporting a safe pumpability window and early zonal isolation.