Abstract: Detecting a spin probe in an oilfield fluid may indicate or determine the amount of the particular chemicals within an oilfield fluid. The detection of the spin probe may also indicate at least one property of the oilfield fluid, such as but not limited to pH, dielectric constant, rotational freedom of the spin probe, at least one chemical, the concentration of at least one chemical, residue of at least one chemical in the fluid, the speciation of coupled chemistry between the spin probe and the chemical, and combinations thereof. In one non-limiting embodiment, the spin probe may be attached to at least one chemical. The oilfield fluid may be or include, but is not limited to, a drilling fluid, a completion fluid, a production fluid, a servicing fluid, and combinations thereof.

Abstract: Lactone/alkylene oxide polymers are useful as additives to inhibit or prevent the deposition of paraffin in hydrocarbon fluids, particularly crude oil produced from a subterranean formation. These polymers are random or block polymers made from addition reactions of a hydroxyl- and/or amine-containing base compound with at least one lactone monomer and at least one alkylene oxide monomer. In one non-limiting embodiment the lactone monomer is optional.

Abstract: Lactone/alkylene oxide polymers are useful as demulsifiers to break emulsions, e.g. water-in-oil and oil-in-water emulsions, particularly oilfield emulsions. These polymers are random or block polymer made from addition reactions of a hydroxyl- and/or amine-containing base compound with at least one lactone monomer and at least one alkylene oxide monomer.

Abstract: Methods of reducing the permeability of a subterranean formation to aqueous-based fluids using a water-soluble relative permeability modifier that comprises a hydrophobically modified polymer, wherein the hydrophobically modified polymer is a reaction product of: a hydrophilic polymer that comprises a polymer selected from the group consisting of a polyvinylamine, a poly(vinylamine/vinyl alcohol), and an alkyl acrylate polymer; and, a hydrophobic compound comprising at least one alkyl chain having a carbon chain length between about 4 and about 22 carbons. The water-soluble relative permeability modifier may be placed within a subterranean drilling operation such that the water-soluble relative permeability modifier attaches onto surfaces within the subterranean formation to effect permeability of aqueous fluids.

Abstract: Detecting a spin probe in an oilfield fluid may indicate or determine the amount of the particular chemicals within an oilfield fluid. The detection of the spin probe may also indicate at least one property of the oilfield fluid, such as but not limited to pH, dielectric constant, rotational freedom of the spin probe, at least one chemical, the concentration of at least one chemical, residue of at least one chemical in the fluid, the speciation of coupled chemistry between the spin probe and the chemical, and combinations thereof. In one non-limiting embodiment, the spin probe may be attached to at least one chemical. The oilfield fluid may be or include, but is not limited to, a drilling fluid, a completion fluid, a production fluid, a servicing fluid, and combinations thereof.

Abstract: Crosslinked lactone/alkylene oxide polymers are useful as demulsifiers to break emulsions, e.g. water-in-oil and oil-in-water emulsions, particularly oilfield emulsions. These polymers are random or block polymers made from addition reactions of a hydroxyl- and/or amine-containing base compound with at least one lactone monomer and at least one alkylene oxide monomer. The polymers may be crosslinked with multifunctional epoxides, multifunctional carboxylic acids, and/or multifunctional anhydrides. The crosslinked polymers may be optionally capped by reaction with monofunctional monomers such as mono-epoxides and/or monofunctional carboxylic acids. The crosslinked polymers are also suitable as oilfield paraffin inhibitors and dispersants.

Abstract: Lactone/alkylene oxide polymers are useful as additives to inhibit or prevent the deposition of paraffin in hydrocarbon fluids, particularly crude oil produced from a subterranean formation. These polymers are random or block polymers made from addition reactions of a hydroxyl- and/or amine-containing base compound with at least one lactone monomer and at least one alkylene oxide monomer. In one non-limiting embodiment the lactone monomer is optional.

Abstract: Lactone/alkylene oxide polymers are useful as demulsifiers to break emulsions, e.g. water-in-oil and oil-in-water emulsions, particularly oilfield emulsions. These polymers are random or block polymer made from addition reactions of a hydroxyl- and/or amine-containing base compound with at least one lactone monomer and at least one alkylene oxide monomer.

Abstract: Methods of reducing the permeability of a subterranean formation to aqueous-based fluids using a water-soluble relative permeability modifier that comprises a hydrophobically modified polymer, wherein the hydrophobically modified polymer is a reaction product of: a hydrophilic polymer that comprises a polymer selected from the group consisting of a polyvinylamine, a poly(vinylamine/vinyl alcohol), and an alkyl acrylate polymer; and, a hydrophobic compound comprising at least one alkyl chain having a carbon chain length between about 4 and about 22 carbons. The water-soluble relative permeability modifier may be placed within a subterranean drilling operation such that the water-soluble relative permeability modifier attaches onto surfaces within the subterranean formation to effect permeability of aqueous fluids.

Abstract: A composition for use in producing a foundry mold. The composition has a binder, which may include a smectite clay. The composition also has a modifier, which may include a metal carbonate. The composition also includes a foundry sand.