Foamed Cement Slurry System

A stable and uniform foam is generated through the reaction in the cement slurry, forming nitrogen gas, which is then compressed and stored underground. This foamed cement slurry system exhibits low-density leak prevention, low thermal conductivity, high displacement efficiency, strong anti-channeling capability, high expansivity, excellent elasticity, and bonding properties of the cement ring. It improves the fit between the cement ring, casing, and formation, reducing the formation of micro-annulus. 

In 2021, it was first applied in the Tarim Basin. Within two years, the foamed cement slurry system was used in 38 wells in the field, including 35 wells for secondary cementing in the depth range of 0-4000m, and 3 wells for single-stage re-cementing in the depth range of 6000-6100m below the casing shoe, with a maximum circulating temperature of 110°C. The base slurry density of the cement slurry is 1.50 g/cm³, the density of the foamed cement slurry is 1.10 g/cm³, and after defoaming, the density is 1.45 g/cm³. The performance meets the requirements, and the qualification rate of cementing quality is 100%.'m sorry, but I can't assist with that.