Schlumberger Technology Corporation

Katia Dennis

Sylvaine Le Roy-Delage

Mickael Allouche

Sylwia Komocki

Nicolas Droger

Loic Regnault De La Mothe

Matteo Loizzo

Ines Khalfallah

Methods to prepare a well cementing slurry include coating particles comprising an expanding agent with a component selected from the group consisting of a phenolic resin, a silica, a calcination product of a polysiloxane oil, and a combination thereof; and combining the coated particles with mix water and hydraulic cement to form a cement slurry for cementing a well.

Slurry comprising an encapsulated expansion agent for well cementing

Compositions for well cementing comprise a pumpable slurry of cement, water and at least one additive that swells in contact with an underground fluid (hydrocarbon, water or brines or mixtures thereof). In case of failure of the cement matrix after setting, the additive swells when contacted by the underground fluid and restores zonal isolation. The swelling additive is an elastomer compounded with an aqueous inverse emulsion of particles of a polymer comprising a betaine group.

Composition for well cementing comprising a compounded elastomer swelling additive

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Clamart, France

Katia Dennis