Patent Number: 7,786,053

Title: Highly branched polymeric materials as coating on weighting agents

Abstract: A wellbore fluid having at least two phases, the wellbore fluid including a fluid phase; and a solid phase including a powdered solid material coated with a polymer, wherein the polymer is the reaction product of a polyesteramide and a crosslinking agent is disclosed.

Inventors: Ballard; David Antony (Aberdeenshire, GB)

Assignee: M-1 L.L.C.

International Classification: C09K 8/524 (20060101); C09K 8/36 (20060101); C09K 8/00 (20060101); C09K 8/588 (20060101); E21B 21/00 (20060101)

Expiration Date: 8/31/12018