AQUEOUS CEMENT COMPOSITIONS INCORPORATING PARTICLES THAT ARE ACTIVATED TO CONTROL RHEOLOGY WHEN WATER SOLUBLE PORTIONS OF THE PARTICLES ARE RELEASED IN THE PRESENCE OF WATER

摘要

The present invention provides strategies for improved control of fluid loss, hydration, settling, and separation of aqueous cementing compositions over a wide temperature and time range. The present invention is based at least in part upon water-effusing particles used as additives for the compositions, wherein the particles are activated to control rheology when water soluble portions of the particles are released in the presence of water.

主权项

1. A method of making an aqueous cementing composition, comprising the steps of
(a) compounding ingredients comprising at least one water soluble polymer powder and a diluent in a manner effective to provide a compounded mass; (b) using the compounded mass to form water effusing particles, said water effusing particles comprising the at least one water soluble polymer in a manner such that the particles effuse in the presence of water to release water-thickening, water soluble portions of the particles, said portions comprising the at least one water soluble polymer, and wherein the rate of effusion of the water soluble portions is a function of the size of the water effusing particles; and (c) causing the water effusing particles to be incorporated into an aqueous cementing composition comprising the particles, an inorganic, hydraulic cement, a dispersant, and an aqueous liquid carrier.