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US 8,689,873 B2Granted
Compositions and methods for improving the toughness of set cements
AssigneeSchlumberger Technology Corporation
InventorsCarlos Abad, Hemant K. J. Ladva
Life of this patent
Estimating the term…
Abstract
The toughness of set cement may be enhanced by incorporating partially cured waterborne resins in the cement matrix. A hardening agent is added to the waterborne resin, and the mixture is allowed to react for periods between about 1 min and 15 min. The waterborne resin with hardening agent is then combined with an inorganic cement to form a pumpable slurry.
Claims17
A method for treating a subterranean well, comprising:
- (i) providing a first composition comprising a slurry comprising an inorganic cement and a retarder comprising a lignosulfonate, a hydrocarboxylic acid, or a phosphonate or a combination thereof;
- (ii) providing a second composition comprising a waterborne resin having an initial particle size;
- (iii) adding a hardening agent to the second composition, and allowing the hardening agent to react with the resin;
- (iv) mixing the first composition with the second composition containing the hardening agent;
- and
- (v) placing the resulting mixture in the well,
- wherein the stoichiometric ratio—hardening agent:resin—is from 0.25:1 to 30:1, and the resin is present in the resulting mixture at a concentration between about 5% and about 95% by volume.
4 more elements
A method for improving zonal isolation in a subterranean well penetrating a wellbore, comprising:
- (i) providing a first composition comprising a slurry comprising an inorganic cement and a retarder comprising a lignosulfonate, a hydrocarboxylic acid, or a phosphonate or a combination thereof;
- (ii) providing a second composition comprising a waterborne resin having an initial particle size;
- (iii) adding a hardening agent to the second composition, and allowing the hardening agent to react with the resin for a time period between about 1 minute and 1 hour;
- (iv) mixing the first composition with the second composition containing the hardening agent;
- and
- (v) placing the resulting mixture in the well,
- wherein the stoichiometric ratio—hardening agent:resin—is from 0.25:1 to 30:1, and the resin is present in the resulting mixture at a concentration between about 5% and about 95% by volume.
4 more elements
A method for consolidating a subterranean formation, comprising:
- (i) providing a first composition comprising a slurry comprising an inorganic cement and a retarder comprising a lignosulfonate, a hydrocarboxylic acid, or a phosphonate or a combination thereof;
- (ii) providing a second composition comprising a waterborne resin having an initial particle size;
- (iii) adding a hardening agent to the second composition, and allowing the hardening agent to react with the resin for a time period between about 1 minute and 1 hour;
- (iv) mixing the first composition with the second composition containing the hardening agent;
- and
- (v) injecting the resulting mixture in the formation,
- wherein the stoichiometric ratio—hardening agent:resin—is from 0.25:1 to 30:1, and the resin is present in the resulting mixture at a concentration between about 5% and about 95% by volume.
4 more elements
Dependencies are inferred from the claim text.