Polymer Coated Bridging Solids and Weighting Agents for Use in Drilling Fluids
OwnerDavid Ballardinventor
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Abstract
A wellbore fluid having at least two phases, including a fluid phase and a solid phase. The solid phase is a powdered solid material coated with a polymer that is the reaction product of a polyether amine and a dialdehyde crosslinking agent. Preferably the polyether amine is a diamine and more preferably the compound acts as a shale hydration inhibitor. The dialdehyde crosslinking agent reacts with the polyether amine compound and forms the polymeric material coating the solid. The polymer is substantially solubilized when the pH of the fluid has a value of less than about 7.
Claims18
A wellbore fluid having at least two phases, the wellbore fluid comprising
- a fluid phase
- a solid phase including a powdered solid material coated with a polymer, wherein the polymer is the reaction product of a polyether amine and a dialdehyde crosslinking agent.
A method of modifying the surface of a powdered solid material, the method comprising:
- contacting the powdered solid material with a solution including a polyether amine reacting the polyether amine compound with a dialdehyde crosslinking agent.
Polymer coated solids for use in a wellbore fluid comprising:
- a powdered solid material
- a polymer coating on the surface of the solid material, wherein the polymer is the reaction product of a polyether amine and a dialdehyde crosslinking agent.
Dependencies are inferred from the claim text.