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Cementing jobs is a very important element of drilling technology considering the completion of a given field. The selection of an appropriate recipe for sealing slurry is vital as this substance should meet a number of technological and rheological requirements. The selection of suitable additives and admixtures and their concentration in the slurry depends on individual geologic conditions as well as technical-technological conditions in the wellbore, where the cementing job is to be performed [1, 4, 7]. Rheological properties of sealing slurries are important at the stage of designing and also during sealing and reinforcing ground and rock mass with the use of drilling technologies. The high efficiency of sealing deep wellbores and rock mass with hole injection methods, attention should be paid to the selection of rheological parameters of slurries, which should depend on [2, 6]: – reservoir conditions of sealed ground and rocks, – geometry of wellbore and circulation system, – interrelations between the volume of injected slurry and flow resistance in the course of pumping, especially in the sealed medium.

The influence of ash from fluidized-bed combustion of lignite on rheological properties of cement slurries