The steam injection process is on of the main methods for enhanced recovery of heavy and extra heavy oil in shallow reservoirs. The cementing of such wells has conventionally been performed using a Portland cement slurry formulated with silica flour to prevent retrogression in compressive strength. The main disadvantage of this type of slurry is the incompatibility between the cement and mud system which results in problems of channeling an microannulus around the casing. Additionally, thermal stresses caused by the steam injection process affect th development of physical properties of set cement increasing permeability and decreasing casing – cement bonding. This paper shows the results of field applications of a new technology t isolate steam injection wells, based on blast furnace slag. Th new technology provides a cementing system that is compatibl with mud, has low permeability, is expansive and develops stabl mechanical properties during and after the steam injection process. These characteristics assure the zonal isolation of pa zones and offer potential incremental improvement to the stea injection process compared with conventional technologies.

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