SELF ADAPTIVE CEMENT SYSTEMS
First Claim
22. A method of cementing a well comprising pumping a cement composition comprising a pumpable slurry of water and a blend of solid comprising cement and a powder material that reacts and/or expands in contact with liquid or gaseous hydrocarbon, wherein once set, the cement has self-healing properties.
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Abstract
A self-adaptive cement system includes cement, water and at least one additive that reacts or/and expands in contact with oil and gas. Several chemical products have been identified including rubber alkylstyrene, polynorbornene, resins such precrosslinked substituted vinyl acrylate copolymers and diatomaceous earth. These additives have the effect of making the cement self-healing in the event of physical failure or damage such as micro-annuli. The self healing property is produced by the contact with subterranean hydrocarbon fluids, the potential repair mechanism is thus activated if and when needed in case of start of loss of zonal isolation. In another embodiment, the expansion is deliberately induced by pumping a hydrocarbon fluid in the vicinity of the set cement.
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Citations
41 Claims
- 22. A method of cementing a well comprising pumping a cement composition comprising a pumpable slurry of water and a blend of solid comprising cement and a powder material that reacts and/or expands in contact with liquid or gaseous hydrocarbon, wherein once set, the cement has self-healing properties.
- 28. A method of repairing a faulty set cement composition, said composition including a pumpable slurry of water and a blend of solid comprising cement and a powder material that reacts and/or expands in contact with liquid or gaseous hydrocarbon, the method further comprising pumping a liquid or gaseous hydrocarbon in the immediate vicinity the faulty set cement composition.
- 34. A method for forming a pumpable self healing cement comprising mixing water, cement and a powder material comprising rubber, poly-2-2-1-bicycloheptene (polynorbornene), alkylstyrene, crosslinked substituted vinyl acrylate copolymers or diatomaceous earth and mixtures thereof to form a cement sheath that, after setting, expands in contact with liquid or gaseous hydrocarbons.
Specification