EXPANDING CEMENT SLURRY WITH ADJUSTABLE PROCESS PROPERTIES Russian patent published in 2014 - IPC C09K8/467 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of well construction, namely, to cement slurries for cementing of casing strings, and tails of additional well bores of oil and gas wells. The expanding cement slurry contains the tempering fluid - water and base consisting from plugging Portland cement, hydroxyethyl cellulose, the plastifier polycarboxylate, polyglycol PLASTEK PG-07, calcium chloride, aluminosilicate pozzolanic additive - metakaolin, diabasic powder and expanding additive - product of intergrinding of waste blast-furnace slag and caustic lime DRS-NU of average chemical composition, by wt %: CaO+MgO - 72-91; SiO₂ - 7-23; Al₂O₃ - 0-4; Fe₂O₃ - 0-2.5; other admixtures - 0-4.5 at the following mixing ratio, by wt %: plugging Portland cement - 93.70-93.85; hydroxyethyl cellulose - 0.15-0.23; plastifier polycarboxylate - 0.8-0.12; polyglycol PLASTEK PG-07 - 0.02-0.06; expanding additive DRS-NU - 3.95-4.0; metakaolin - 0.45-0.54; diabasic powder - 1.05-1.26; calcium chloride - 0.45-1.0. The water content in the solution ensures the water mixing ratio with the base 0.45-0.55.

EFFECT: improvement of strength characteristics of cement stone obtained from the offered cementing slurry.

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