CONTEST

[:ru]Бурыгин И. В.[:en]Burygin I. V.[:] [:ru]аспирант, победитель 1-го Международного семинара-конкурса молодых ученых и аспирантов, работающих в области вяжущих веществ, бетонов и сухих смесей в номинации «За лучшую работу в сфере применения инновационных подходов к модернизации цементных предприятий», Российский химико-технологический университет им. Д. И. Менделеева, Москва, Россия[:en]Postgraduate Student, the winner of the first International seminar-contest for young scientists and postgraduate students specializing in binding agents, concrete and dry mixtures in nomination «For the best work in the field of applying innovative approach to modernization of cement enterprises», Mendeleyev University of Chemical Technology of Russia, Moscow, Russia[:]

[:ru]Кузнецова Т. В.[:en]Kuznetsova T. V.[:] [:ru]научный руководитель, докт. техн. наук, проф., Российский химико-технологический университет им. Д. И. Менделеева, Москва, Россия[:en]esearch adviser, Doct. Eng. Sc., Prof., Mendeleyev University of Chemical Technology of Russia, Moscow, Russia[:]

Alitinform №6 (17) 2010 г. 93-98 p.

Abstract

The article discusses the process of hydration of oil–well cement, designed for cementing high temperature wells. It is shown that at high temperatures and pressures (250 °C, P = 50 MPa) Portland cement stone is not resistant due to formation of highly basic calcium hydrosilicates while hydration process of Portland cement. To ensure wells’ longevity of service, mixtures are offered, consisting of blast–furnace slag of various compositions and belite sludge with sand, which provide low basic calcium hydrosilicates while their hydration. High density of cementing mixture is achieved by introducing barite rocks into its composition, which in addition to increasing its density provides hydrosilicates’ strengthening through introduction of sulfate ions and barium ions into tobermorite gel.

Key words:

oil–well cement; heavyweight oil–well cement; high temperature oil–well cement; hydratation; barytic weighting; cement stone strength