Abstract:
A method of treating a subterranean formation comprising: introducing a first cement composition into the subterranean formation, wherein the first cement composition comprises: (A) a first aluminate cement; and (B) a base fluid; simultaneously introducing a second cement composition into the subterranean formation, wherein the second cement composition comprises: (A) a second cement consisting of cement or a pozzolan; and (B) a base fluid, wherein at least a portion of the first and second cement compositions mix together after introduction into the subterranean formation to form a mixed cement composition, and wherein at least some of the first and second cement compositions or at least some of the mixed cement composition enters into a highly-permeable area located within the subterranean formation; and allowing the mixed cement composition to set. The base fluid can be an aqueous liquid or a hydrocarbon liquid.
Abstract:
Disclosed herein are cement compositions and methods of using set-delayed cement compositions in subterranean formations. A method of cementing in a subterranean formation, may comprise providing a set-delayed cement composition comprising water, pumice, hydrated lime, and a set retarder, activating the set-delayed cement composition with a cement set activator, wherein the cement set activator comprises at least one activator selected from the group consisting of nanosilica, a polyphosphate, and combinations thereof, introducing the set-delayed cement composition into a subterranean formation, and allowing the set-delayed cement composition to set in the subterranean formation.
Abstract:
Embodiments relate to the use of alkali aluminates and alkali silicates with cement kiln dust to form a settable composition for use in subterranean operations. An embodiment provides a method comprising: introducing a settable composition comprising cement kiln dust, an alkali aluminate, an alkali silicate, and an aqueous carrier fluid into a subterranean formation; and allowing the settable composition to set and thereby reduce fluid flow through a portion of the subterranean formation.
Abstract:
Methods of using the set-delayed cement slurries and compositions resulting from the combination of the set-delayed cement slurries are also described. A method may comprise providing a first set-delayed cement slurry comprising a pozzolanic cement and/or a Portland cement, water, and a first cement set retarder; providing a second set-delayed cement slurry comprising calcium-aluminate and a second cement set retarder; mixing the first slurry and the second slurry to form a cement composition; and allowing the cement composition to set.
Abstract:
Se incluyen métodos y sistemas para aplicaciones de taponamiento y abandono. Un método comprende proporcionar una composición de cemento de vida útil prolongada que comprende cemento de aluminato de calcio, agua y un retardante de fraguado de cemento. El método comprende además mezclar la composición de cemento de vida útil prolongada con un activador de fraguado de cemento para activar la composición de cemento de vida útil prolongada; introducir la composición de cemento de vida útil prolongada activada en un pozo; y permitir que la composición de cemento de vida útil prolongada activada fragüe en el pozo para formar un tapón en el pozo. El tapón tiene una permeabilidad menor que 0.1 milidarcies.
Abstract:
Se describen diversos métodos y composiciones, incluso, en una modalidad, un método de cementación que comprende: proporcionar una suspensión de puzolana que comprende una puzolana y agua; proporcionar una suspensión de cal que comprende cal hidratada y agua; permitir que la suspensión de puzolana y la suspensión de cal permanezcan separadas durante aproximadamente un día o más; mezclar la suspensión de puzolana y la suspensión de cal para formar una composición de cemento: y permitir que la composición de cemento fragüe.
Abstract:
Se describen en la presente composiciones y métodos para utilizar composiciones de cemento con retraso de fraguado en formaciones subterráneas. En una modalidad, se describe un método de taponamiento de un pozo. El método comprende proporcionar una composición de cemento con fraguado retardado que comprende piedra pómez, cal hidratada, un retardador del fraguado de cemento y agua; activar la composición de cemento con fraguado retardado para producir una composición de cemento con fraguado retardado; introducir la composición de cemento con fraguado retardado en el pozo; y permitir que la composición de cemento con fraguado retardado forme un tapón en el pozo que tenga una permeabilidad menor que 0,1 milidarcy.
Abstract:
Methods and compositions for cementing are disclosed. Embodiments include a method of cementing comprising: providing a set-delayed cement composition comprising water, pumice, hydrated lime, a primary set retarder, a secondary set retarder; activating the set-delayed cement composition to produce an activated cement composition; introducing the activated cement composition into a subterranean formation; and allowing the activated cement composition to set in the subterranean formation.
Abstract:
Disclosed herein is a mixing assembly, comprising well tubing; a tubing release tool operatively coupled to the well tubing and axially offset therefrom; and a mixing device operatively coupled to the tubing release tool and axially offset therefrom, the mixing device having at least one mixing aid chosen from the group consisting of: one or more jet ports, one or more baffles, a spiral mixer with a tubing release tool above it, and any combination thereof.
Abstract:
CEMENT ACTIVATOR COMPOSITION FOR TREATMENT OF SUBTERRANEAN FORMATIONS Various embodiments disclosed relate to cement activator compositions for treatment of subterranean formations. In various embodiments, the present invention provides a method of treating a subterranean formation including placing in the subterranean formation a liquid cement activator composition including water, an alkali sulfate salt, a polyphosphate salt, and a stabilizer polymer.