Methods of generating gas in and foaming well cement compositions
First Claim
1. A method of generating gas in a cement composition comprising the steps of:
- providing the cement composition comprising a hydraulic cement, water, and an oxidizing agent;
providing an aqueous solution or dispersion that comprises at least one gas generating chemical; and
contacting the cement composition downstream of at least one cement pump with the aqueous solution or dispersion so that a gas is generated in the cement composition.
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Abstract
The present invention relates to methods of generating gas in and forming cement compositions that may be introduced into a subterranean zone. A method of the present invention provides a method of generating gas in a cement composition that comprises providing the cement composition comprising a hydraulic cement and water; providing an oxidizing agent; providing at least one gas generating chemical; and contacting the cement composition with the oxidizing agent and/or the gas generating chemical downstream of at least one cement pump so that a gas is generated in the cement composition downstream of at least one cement pump. Methods of foaming cement compositions are also provided.
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Citations
85 Claims
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1. A method of generating gas in a cement composition comprising the steps of:
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providing the cement composition comprising a hydraulic cement, water, and an oxidizing agent;
providing an aqueous solution or dispersion that comprises at least one gas generating chemical; and
contacting the cement composition downstream of at least one cement pump with the aqueous solution or dispersion so that a gas is generated in the cement composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of generating a gas in a cement composition comprising the steps of:
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providing the cement composition comprising a hydraulic cement and water;
providing an oxidizing agent;
contacting the cement composition with the oxidizing agent;
contacting the cement composition downstream of at least one cement pump with at least one gas generating chemical;
allowing the gas generating chemical to react so as to generate gas in the cement composition; and
placing the cement composition into a subterranean zone. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of cementing a subterranean zone comprising the steps of:
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providing the cement composition that comprises a hydraulic cement and water;
contacting the cement composition downstream of at least one cement pump with an oxidizing agent and at least one gas generating chemical;
allowing gas to generate in the cement composition;
placing the cement composition in the subterranean zone; and
allowing the cement to set in the subterranean zone. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A method of cementing a subterranean zone comprising the steps of:
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providing a cement composition comprising a hydraulic cement, water, and an oxidizing agent;
contacting the cement composition downstream of at least one cement pump with an aqueous solution or dispersion that comprises water and at least one gas generating chemical;
allowing gas to be generated in the cement composition to form a foamed cement composition;
placing the foamed cement composition in the subterranean zone; and
allowing the foamed cement composition to set in the subterranean zone. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49)
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50. A method of foaming a cement composition
providing the cement composition comprising a hydraulic cement and water; -
contacting the cement composition with an aqueous solution or dispersion that comprises at least one gas generating chemical;
contacting the cement composition with an oxidizing agent downstream of at least one cement pump;
placing the cement composition in the subterranean zone; and
allowing the gas generating chemical to react so as to generate a gas in the cement composition to foam the cement composition in a subterranean zone to form a foamed cement composition. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68)
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69. A method of reducing gas-locking problems when cementing a subterranean zone comprising the steps of:
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providing a cement composition that comprises a hydraulic cement, water, and an oxidizing agent;
contacting the cement composition downstream of at least one cement pump with an aqueous solution or dispersion that comprises water and a gas generating chemical;
allowing the gas generating chemical to react so as to produce gas in the cement composition to produce a foamed cement composition;
placing the cement composition in a chosen subterranean zone; and
allowing the foamed cement composition to set in the subterranean zone. - View Dependent Claims (70)
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71. A method of generating gas in a cement composition comprising the steps of:
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providing the cement composition comprising a hydraulic cement, water, and at least one gas generating chemical;
providing an aqueous solution or dispersion that comprises an oxidizing agent; and
contacting the cement composition downstream of at least one cement pump with the aqueous solution or dispersion so that a gas is generated in the cement composition downstream of at least one cement pump. - View Dependent Claims (72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85)
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Specification