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US 6,332,920 B1Granted
Slag for cementing a well, in particular an oil well
AssigneesBouygues, Institut Francais du Petrole
InventorsChristine Noik, Alain Rivereau, Christian Vernet
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Abstract
The invention concerns the cementation of a well. A slag is used which comprises a hydraulic binder, a microsilica, a mineral addition, a superplasticizing agent and water, under defined granulometry and percentage conditions. The solublefigure relates to three compositions according to the invention but which differ by the origin of the microsilica. The invention applies notably to the cementation of an oil well.
Claims35
A cement composition suitable for the cementation of a well, comprising:
- at least one hydraulic binder selected from the group consisting of a Class G (API) Portland cement, and a Class H (API) Portland cement;
- a microsilica of a granulometry in the range of 0.1 to 50 micrometers, in a proportion of 20 to 35% by weight of the hydraulic binder;
- medium particles having a granulometry in the range of 5-200 micrometers consisting of silica sand whose particles have a mean size close to 50 micrometers, in a proportion of 20 to 35% by weight in relation to the hydraulic binder, and wherein an amount of the medium particles is less than or equal to an amount of said microsilica;
- a water-soluble superplasticizing and/or liquefying agent in a proportion of between 1% and 3% by weight in relation to the hydraulic binder;
- and
- water;
- wherein the amount of water is equal at most to 30% of the weight of the hydraulic binder.
4 more elements
A cement composition suitable for the cementation of a well, consisting essentially of:
- at least one hydraulic binder selected from the group consisting of a Class G (API) Portland cement, and a Class H (API) Portland cement;
- a microsilica of a granulometry in the range of 0.1 to 50 micrometers, in a proportion of 20 to 35% by weight of the hydraulic binder;
- medium particles, which are mineral and/or organic, having a granulometry in the range of 0.5-200 micrometers, in a proportion of 20 to 35% by weight in relation to the hydraulic binder, and wherein an amount of the medium particles is less than or equal to an amount of said microsilica;
- a water-soluble superplasticizing and/or liquefying agent in a proportion of between 1% and 3% by weight in relation to the hydraulic binder;
- and
- water;
- wherein the amount of water is equal to at most 30% of the weight of the hydraulic binder.
4 more elements
Dependencies are inferred from the claim text.