Cement compositions and methods of preparation thereof
AssigneeKraton Corporation
InventorsStephanie Grant, David Germack, Steven Huynh
Life of this patent
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Abstract
Cement compositions comprising a modified styrenic block copolymers and methods for making/using the same are disclosed. The modified styrenic block copolymer has at least one monoalkenyl arene polymer block A, at least one conjugated diene polymer block B, and at least an epoxy functional group or derivative thereof. The modified styrenic block copolymer has a degree of epoxidation of up to 10-90%. The cement composition can be used in subterranean applications, as well as in building and construction materials. The modified styrenic block copolymers swell upon contact water or other aqueous fluids to seal cracks in the cement.
Claims19
A cement composition comprising:
- 100 parts by weight of a cement;
- 0.01-20 parts by weight of a modified styrenic block copolymer having:
- at least one monoalkenyl arene polymer block A,
- at least one conjugated diene polymer block B, and
- at least an epoxy functional group or derivative thereof;
- wherein:
- the modified styrenic block copolymer has a degree of functionalization of 10-90% in the block B,
- the modified styrenic block copolymer is characterized as having an absorption rate of at least 0.05% upon exposure to water for at least 7 days;
- a mass ratio of an aqueous fluid to cement of 1:3 to 3:4.
A method of cementing a wellbore comprising:
- preparing a wellbore cementing composition comprising:
- 100 parts by weight of a cement,
- 0.01-20 parts by weight of a modified styrenic block copolymer having:
- at least one monoalkenyl arene polymer block A,
- at least one conjugated diene polymer block B, and
- at least an epoxy functional group or derivative thereof;
- wherein:
- the modified styrenic block copolymer has a degree of functionalization of 10-90% in the block B,
- the modified styrenic block copolymer is characterized as having an absorption rate of at least 0.05% upon exposure to water for at least 7 days;
- a mass ratio of an aqueous fluid to cement of 1:3 to 3:4;
- placing the wellbore cementing composition in the wellbore;
- and
- allowing the cementing composition to set.
Dependencies are inferred from the claim text.