High-temperature cementing retarder for medium and deep oil wells. Prolongs thickening time effectively, delivers right-angle thickening profile, and enhances final compressive strength of the cement stone.
This high-temperature oil well cementing retarder is composed of sulfonate and organic salts. It dissolves rapidly in water due to its strong hydrophilic character, and works by adsorbing onto the surfaces of cement slurry hydrates to inhibit contact with water, while chelating with Ca²⁺ ions to prevent early crystal nucleus formation — effectively retarding the thickening process.
The product is designed for medium and deep well cementing operations where BHCT ranges from 60°C to 180°C. It delivers a right-angle thickening profile — maintaining low consistency during the pumping window before rapidly transitioning to full set — and enhances final compressive strength through weak C3A adsorption performance.
| Parameter | Specification |
|---|---|
| Appearance | White particles |
| Water Content | ≤ 8.0% |
| Fineness (0.315 mm sieve) | ≤ 15.0% |
| Initial Consistency (90°C, 53.3 MPa, 49 min) | ≤ 30.0 Bc |
| Thickening Time (90°C, 53.3 MPa, 49 min) | ≥ 120.0 min |
| Mutation Value of Thickening Curve | ≤ 10.0 Bc |
| Thickening Time Extension Value | ≥ 60.0 min |
| Sensitivity of Increase | ≤ 25.0% |
| Sensitivity of Temperature | ≤ 20.0% |
| Transition Time (90°C, 53.3 MPa, 49 min) | ≤ 40.0 min |
| Free Liquid (90°C) | ≤ 1.4% |
| Compressive Strength (113°C, 21 MPa, 24h) | ≥ 14.0 MPa |
Test conditions per API Spec 10A / GB/T 19139. Contact us for performance data at specific BHCT and pressure conditions.
| Normal Dosage | 0.3% – 2.5% BWOC (by weight of cement). Adjust based on BHCT and required thickening time. |
| Temperature Range | 60°C – 180°C BHCT |
| Compatibility | Compatible with G302 fluid loss additive. If cement slurry settlement occurs due to dispersion performance, add appropriate G302 to stabilize the slurry system. |
| Mixing | Add to mix water prior to cement. Ensure complete dissolution before blending with cement powder. |
| Lab Testing | Thickening time testing under actual BHCT and pressure conditions is recommended before field application. |
| Standard Packaging | 25 kg three-layer plastic bags |
| Storage Conditions | Keep away from moisture. Store in a cool, dry environment. |
| Shelf Life | 2 years from manufacture date under recommended storage conditions |
It delays the setting (thickening) of cement slurry during oil and gas well cementing, giving crews enough pump time to place the slurry at depth before it hardens. This retarder works by adsorbing onto cement hydrate surfaces and chelating with Ca²⁺ ions to prevent early crystal formation, delivering a right-angle thickening profile — low, stable consistency during pumping followed by a rapid transition to full set.
It is designed for medium and deep well cementing operations with bottom-hole circulating temperature (BHCT) from 60°C to 180°C, making it suitable for both moderately deep wells and high-temperature deep or geothermal wells.
Normal dosage is 0.3–2.5% BWOC (by weight of cement), adjusted based on the well's BHCT and the thickening time required. Lab testing under the actual BHCT and pressure conditions of the job is recommended before field application, since performance is sensitive to both temperature and cement system.
No — this retarder is formulated with weak C3A adsorption performance, which enhances rather than compromises the final compressive strength of the set cement stone, while still extending thickening time during the pumping window.
Yes. It is compatible with G302 fluid loss additive — if cement slurry settlement occurs due to dispersion performance, adding G302 helps stabilize the slurry system. It can also be blended with other cementing chemicals to formulate tailored slurry systems for specific well conditions.
Performance is tested per API Spec 10A / GB/T 19139, covering thickening time, initial consistency, free liquid, and compressive strength under standard high-temperature test conditions. Standard packaging is 25 kg three-layer plastic bags, with a 2-year shelf life from manufacture date when stored in a cool, dry environment away from moisture.