CEMENT GROUT COMPOSITION WITH STABLE FOAM AND METHOD OF PREPARING SAID COMPOSITION Russian patent published in 2012 - IPC C04B38/10 C09K8/467 C04B40/00 

FIELD: chemistry.

SUBSTANCE: present invention relates to a foamed cement composition for use in different cell cementing operations, as well as a method of producing the foamed cement composition. The foamed cement composition contains a foaming composition which contains cement, a water-based liquid in amount ranging from approximately 20 wt% to 80 wt% of the weight of the cement, a foaming composition containing an ionic gel system in amount ranging from approximately 0.05 wt % to 10 wt % of the weight of the water-based liquid, where the ionic gel system contains a charged polymer and an oppositely charged surfactant, and a gas in amount ranging from approximately 5 vol. % to 85 vol. % of the volume of the foaming composition for preparing the foamed cement composition. The method of preparing the foamed cement composition involves adding cement to the water-based liquid, adding a first additive composition containing a charged polymer, a stabilising agent and water, adding a second additive composition containing an oppositely charged surfactant, where the charged polymer and the oppositely charged surfactant form the ionic gel system, and injecting gas which is sufficient to form the foamed cement composition. The invention is developed in subclaims.

EFFECT: stabilisation of the porous structure of the foamed cement composition.

28 cl, 2 ex