APPLICATION OF ULTRA-LOW DENSITY CEMENT SLURRY OF EARLY STRENGTH PROPERTY IN NATURAL GAS WELL CEMENTING

A new cement slurry system was developed for improving the cementing quality in gas wells and protecting casing, especially designed for improving the cementing quality in the upper hole section.The laboratory study determined the type of lighting agent and granularity ratio, as well as the formula according to the performance requirements of the light weight cement, aod evaluations were also conducted on the thixotropic lost circulation property and its stability.The newly developed cement slurry system owned such advantages as stable performance, minimum influence of density changes on its performance, good lost circulation control, fast development of early strength, etc.