Oil well cement retarder is composed of starch, hydroxycarboxylic acid and other compounds; The appearance is white powder, non-toxic and non-corrosive; It is generally used for oil and gas wells with a bottomhole circulation temperature of less than 90°C; After adding this product, it can effectively prolong the thickening time of cement slurry, reduce the consistency of cement slurry, and improve the rheology of cement slurry; The low-molecular-weight carbohydrate functional groups contained in the medium-temperature retarder can be adsorbed on the C-S-H gel layer, making the structure more dense, preventing the further hydration of cement, and delaying the setting and hardening time of cement. The part of the retarder in the free state is combined with the calcium ions in the cement by electrostatics, which inhibits the growth of calcium hydroxide crystals, improves the fluidity of cement slurry, and is conducive to pumping and construction safety. It not only has good retarding performance, but also has obvious drag reduction effect, which changes with the dosage; The difference in thickening time (80°C/40Mpa) is greater than 50min; Compatible with dispersants, it can give full play to its slow-setting and drag-reducing effects. It is recommended to increase the dosage by 0.3-1.0%.
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