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Browsing by Subject "cement aggregates"

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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Problemy eksploatacyjne agregatów cementacyjnych w operacjach o zwiększonym ryzyku
    (2006) Bednarz, Stanisław; Bochenek, Kazimierz; Serafin, Robert
    Cementing of drilling wells in some conditions may encounter difficulties related with the behaviour of the cement aggregate, e.g. injection of cement slurry when packer has to be introduced to the annular space, injection of foam solutions, sealing up to prevent the migration of gas through the sealing cover, injection of solutions with microspheres. Owing to the progressive and turning motion, hydraulic vibrations are observed during the cement plunger pump operation. They intensify when an aerated slurry is injected, e.g. air adsorbed by microspheres, gas bubbles in foamy cement or having high density/viscosity (at high rates of the plunger). Other operations sensitive to hydraulic vibrations are cementing of shallow gas horizons, especially in clayey intervals prone to shrinking after a contact with the cement filtrate. The recirculation of the slurry to degas the aggregate hinders fluent application of the cementing procedure. Possibilities of limiting exploitation difficulties of aggregate operation to cementing operations are presented in the paper.