Studies on a High Strength Low Density Cement Slurry

In deep, high temperature well cement operation, a big difference between the temperatures at both ends of a long cement column existed. Cementing a long interval in one time may cause cement slurry losses into the formations. A low-density cement slurry was recently formulated based on theory of high-packing to solve the problem. Laboratory experiments showed that the formulated cement slurry had the advantages such as low density, high strength, low fluid loss and stable rheology, etc. This formulation was employed in more than 200 wells, all met the cement job requirements.