Abstract: A composition and method to control viscosity with respect to temperature for an oil-based drilling fluid by adding a polyamide drilling fluid additive to the oil based drilling fluid. In some embodiments, a polyamide drilling fluid additive includes a reaction product of (i) a carboxylic acid with a single carboxylic moiety; (ii) a carboxylic acid with two carboxylic moieties, a carboxylic acid with three carboxylic moieties and combinations thereof; and (iii) a polyamine having an amine functionality of two or more; and placing the placing the oil based drilling fluid into the subterranean formation.

Abstract: A polymerizable nail coating composition includes a reactive (meth) acrylate monomer; a reactive (meth) acrylate terminated polymer selected from the group consisting of a reactive (meth) acrylate terminated polyol polymer, a reactive (meth) acrylate terminated polyester polymer, a reactive (meth) acrylate terminated polyol urethane polymer, a reactive (meth) acrylate terminated polyester polymer, and combinations thereof wherein said polymer is derived at least in part from a polyether or a polyester having either a melting point between 20° C. and 60° C. or a glass transition temperature between 20° C. and 60° C.; and a polymerization photoinitiator, wherein upon exposure to radiant energy, said polymerizable nail coating composition cures to a photocrosslinked polymer.

Abstract: A method to control viscosity with respect to shear rate for an oil based drilling fluid by adding a polyamide drilling fluid additive to the oil based drilling fluid. In some embodiments, a polyamide drilling fluid additive includes a reaction product of (i) a carboxylic acid with a single carboxylic moiety or two carboxylic moieties, and (ii) a polyamine having an amine functionality of two or more; and placing the placing the oil based drilling fluid into the subterranean formation.

Abstract: The present application, at least in part, is directed to a method of providing a substantially constant rheological profile of an oil-based drilling fluid over a temperature range of about 120° F. to about 40° F. In some embodiments, the method comprises adding a drilling fluid additive to the drilling fluid, wherein the drilling fluid additive consists essentially of a polyamide and a set of at least one or more mono-carboxyl units. The polyamide has (a) repeat units of (i) a poly-carboxyl unit with at least two carboxylic moieties; and (ii) a polyamine unit having an amine functionality of two or more and the one or more mono-carboxyl units being positioned on the polyamide at a position selected from the group consisting of: an end position, a pendant position and combinations thereof.

Abstract: A method of providing a substantially constant equivalent circulating density of a drilling fluid over a temperature range of about 120° F. to about 40° F. includes adding a drilling fluid additive to the drilling fluid, wherein the drilling fluid additive includes the reaction product of a carboxylic acid with a single carboxylic moiety; and a polyamine having at least two primary amino functionalities and optionally at least one secondary amino functionality.