Reservoir drilling fluids consist of cationic heterocyclic polymers, synthesis, formulation, and applications

Abstract

A wellbore fluid may include a base fluid and at least one cationic heterocyclic polymer in an amount effective to increase a viscosity of the base fluid, the cationic heterocyclic polymer includes at least two distinct cyclic monomers, at least one of which has at least two heteroatoms in the cyclic structure. A method of drilling a wellbore may introduce such wellbore fluid into the wellbore. A method of producing a cationic heterocyclic polymer may include reacting, in a solvent selected from the group that includes tetrahydrofuran, dioxane, dichloromethane, alcoholic solvents, chlorinated solvents, aromatic hydrocarbon solvents, or mixture thereof, at least two distinct cyclic monomers, at least one of which has at least two heteroatoms in the cyclic structure.

Dependencies are inferred from the claim text.