Set-activated cementitious compositions and methods
AssigneeHalliburton Company
InventorsDavid D. Onan, Dralen T. Terry, Wendell D. Riley
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Abstract
Set-activated cementitious compositions and methods of using such compositions in cementing subterranean zones penetrated by well bores are provided. The compositions are basically comprised of water, particulate condensed silica fume suspended in the water; a dispersing agent for facilitating the dispersal of the silica fume particles in the water and maintaining the particles in suspension therein, a set-activator and a set delaying additive for increasing the time in which the composition sets after the set-activator is combined therewith.
Claims12
A method of cementing a subterranean zone penetrated by a well bore comprising the steps of:
- forming a pumpable cementitious composition consisting essentially of water, particulate condensed silica fume consists essentially of particles having diameters less than about 1 micrometer suspended in said water in a weight ratio of condensed silica fume to water in the range of from about 1:2 to about 1.5:1, a dispersing agent for facilitating the dispersal of said silica fume particles in said water and maintaining said particles in suspension therein, a set-activator selected from calcium hydroxide, magnesium oxide, or mixtures thereof, and a set delaying additive for increasing the time in which said composition sets after said set-activator is combined therewith;
- pumping said cementitious composition into said zone by way of said well bore;
- and
- allowing said cementitious composition to set in said zone.
Dependencies are inferred from the claim text.