Cementing composition and application thereof to cementing oil wells or the like
AssigneeSchlumberger Technology Corporation
InventorsVéronique Barlet-Gouedard, Pierre Maroy, Bruno Langlois, Roland Reeb
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Abstract
Cementing compositions which are particularly suitable for squeeze cementing operations, comprise an aqueous phase, and a micro-cement, the aqueous phase including an aqueous suspension comprising a vinyl acetate type polymer obtained by chemically cross-linking a polyvinyl compound, a nanolatex and an anionic surfactant with a cloud point of more than 80° C.
Claims15
A cementing composition for squeeze cementing operations, comprising an aqueous phase, and a micro-cement, the aqueous phase comprising an aqueous suspension comprising:
- a cross-linked polyvinyl alcohol polymer obtained by chemically cross-linking, in a reaction with controlled stirring, a polyvinyl alcohol (PVA) in solution with a polyfunctional cross-linking agent which cross-links alcohol groups of the PVA, the molar concentration of said cross-linking agent with respect to PVA monomer residues being the range 0.1% to 0.5%;
- a nanolatex;
- an anionic surfactant with a cloud point of more than 80° C.
A method of cementing a well comprising
- (i) providing a cementing composition comprising an aqueous phase, and a micro-cement, the aqueous phase comprising an aqueous suspension comprising:
- a cross-linked polyvinyl alcohol polymer obtained by chemically cross-linking, in a reaction with controlled stirring, a polyvinyl alcohol (PVA) in solution with a polyfunctional cross-linking agent which cross-links alcohol groups of the PVA, the molar concentration of said cross-linking agent with respect to PVA monomer residues being the range 0.1% to 0.5%;
- a nanolatex;
- an anionic surfactant with a cloud point of more than 80° C.
- (ii) letting the cementing composition set.
Dependencies are inferred from the claim text.