Russian field tests yield cements for arctic wellsстатья
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Дата последнего поиска статьи во внешних источниках: 24 октября 2018 г.
Аннотация:Oil and gas fields of Russia are being developed under harsh climatic and geological conditions of the extreme north and Arctic sea shelf.
These complicated geological conditions for well construction and operation are characterized by, first of all, the presence of permafrost, intrapermafrost water, upper gas flowing horizons and soft rocks with low fracturing gradients.
Replacing of a part of hemihydrate gypsum in the gypsum-cement mixture by aluminate cement with a complex additive (plasticizing agent – sodium chloride) enables to obtain cement, which meets requirements for cementing arctic wells.