DosR™ EZ-LT Retarder
Liquid retarder for predictable thickening-time control at low to moderate bottom-hole circulating temperatures
DosR™ EZ-LT Retarder
Extend the thickening time but does not affect the cement hydration rate
DosR™ EZ-LT Retarder is a liquid cement retarder intended for primary and remedial cementing operations where the bottom-hole circulating temperature falls between 60 °C and 104 °C (140–220 °F). Within this window the additive provides a monotonic and reproducible relationship between concentration, circulating temperature, and thickening time. Its response is characterised by low sensitivity to small deviations in either dosage or temperature, which reduces the consequence of normal field variability in mixing accuracy and temperature prediction.
| Configuration | 38 °C | 60 °C | 93 °C | 121 °C | 149 °C |
|---|---|---|---|---|---|
| DosR™ EZ-LT Retarder | • | • | |||
| DosR™ EZ-LT Retarder + Aid | • | • | • |
Performance Highlight
Thickening time as a function of BHCT and concentration
Thickening times determined on a Class G slurry at 1,896 kg/m³ (15.8 lbm/gal) mixed with fresh water. Each curve represents a fixed retarder concentration; the horizontal axis is the bottom-hole circulating temperature applied during the test.
Compatibility
API Class G and Class H.
Retarder aid
Aid extends the upper application limit to 121 °C. A synergistic extension of thickening time has been documented at 85 °C.
Mix water
Fresh water and seawater.
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