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

Patent metadata

Field	Value
Publication number	US-10858570-B2
Application number	US-201314415220-A
Country	US
Kind code	B2
Filing date	Jul 13, 2013
Priority date	Jul 17, 2012
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

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.

First claim

The invention claimed is:

1. An aqueous cementing composition, comprising;
(a) an aqueous liquid carrier;
(b) an inorganic, hydraulic cement in admixture with the liquid carrier; and
(c) a plurality of compounded, water-effusing particles dispersed in the composition, said compounded, water-effusing particles comprising reversibly agglomerated, water soluble polymer particles, said reversibly agglomerated, water soluble, polymer particles comprising at least one water soluble polymer comprising a hydrophilic polymer backbone with pendent hydrophobic groups, wherein the water-effusing particles effuse in the presence of water and an increase in temperature to release water-thickening, water soluble portions of the water-soluble polymer particles, said portions comprising the at least one water soluble polymer, wherein the rate of effusion of the water soluble portions is a function of the size of the water effusing particles, and

wherein the cementing composition has a plastic viscosity (PIO in the range of 50 to 300 when the composition is at a temperature in the range of 60° F. to 90° F.

Assignees

• Dow Global Technologies Llc

Inventors

• Witham Cole
• Kuhlman Roger
• Poindexter Michael
• Theuerkauf Jorg
• Radler Michael

Classifications

• C04B18/022 Primary

  agglomerated by an organic binder · CPC title

• C04B40/0633

  Chemical separation of ingredients, e.g. slowly soluble activator · CPC title

• C09K8/487 Primary

  Fluid loss control additives; Additives for reducing or preventing circulation loss · CPC title

• C04B24/38

  Polysaccharides or derivatives thereof {(C04B24/243 takes precedence)} · CPC title

• C04B16/02

  Cellulosic materials (cellulosic waste materials, e.g. sawdust, rice husks, C04B18/24) · CPC title