Abstract: Crosslinked polymer additives that may be used as thinners and/or deflocculants in subterranean treatment fluids are provided. In one embodiment, the methods comprise: providing a treatment fluid comprising an aqueous base fluid, a viscosifying agent, and a crosslinked synthetic polymer that comprises a copolymer of at least a first monomer comprising 2-acrylamido-2-methylpropane sulfonic acid or any salt thereof, and a second monomer comprising an N-vinyl amide, and at least one crosslinking agent, wherein the average molecular weight of the crosslinked synthetic polymer is less than about 3,000,000 grams per mole; and introducing the treatment fluid into at least a portion of a well bore penetrating at least a portion of a subterranean formation.

Abstract: A polymer microsphere for use as a fluid loss additive in drilling muds including a hydrophobic core of hydrophobic monomers and a hydrophilic shell of hydrophilic monomers wherein the hydrophilic shell surrounds the hydrophobic core. The polymer microsphere is capable of forming micelles or microgels in water without using surfactants and can be block, graft, and random copolymers. The hydrophilic shell is physically or chemically linked to the hydrophobic core. The polymer microsphere further includes crosslinkers, preferably where the crosslinkers are monomers containing at least two ethylenically unsaturated groups.

Abstract: A polymer microsphere for use as a fluid loss additive in drilling muds including a hydrophobic core of hydrophobic monomers and a hydrophilic shell of hydrophilic monomers wherein the hydrophilic shell surrounds the hydrophobic core. The polymer microsphere is capable of forming micelles or microgels in water without using surfactants and can be block, graft, and random copolymers. The hydrophilic shell is physically or chemically linked to the hydrophobic core. The polymer microsphere further includes crosslinkers, preferably where the crosslinkers are monomers containing at least two ethylenically unsaturated groups.

Abstract: Various embodiments disclosed relate to compositions including a viscosifier polymer and a polyamine viscosity modifier and methods of using the same for treatment of subterranean formations. In various embodiments, the present invention provides a method of treating a subterranean formation. The method includes placing in a subterranean formation a composition including a viscosifier polymer and a polyamine viscosity modifier.

Abstract: The present disclosure provides treatment fluids that comprise star macromolecules as a fluid loss additive or a viscosifier. An embodiment of the present disclosure is a method comprising: providing a treatment fluid that comprises: an aqueous base fluid; and a star macromolecule that comprises: a hydraulic polymeric core, a first group of polymeric arms attached to the core wherein each of the arms in the first group consists of hydrophilic monomers, and a second group of polymeric arms attached to the core wherein each of the arms in the second group comprises at least one hydrophilic homopolymeric segment and at least one hydrophobic homopolymeric segment; and introducing the treatment fluid into a wellbore penetrating at least a portion of a subterranean formation.

Abstract: Crosslinked sulfonate-containing polymers may be stable in high density, monovalent brines, which may render such polymers particularly useful in drilling fluids in general and, especially, in the subclass of drilling fluids known as drill-in fluids. For example, a drilling fluid may include a crosslinked sulfonate-containing polymer dispersed in a monovalent brine having a density of about 8 lb/gal to about 20 lb/gal, wherein the crosslinked sulfonate-containing polymer comprises: reactants of a first repeating unit and a crosslinker that react to form the crosslinked sulfonate-containing polymer, wherein the first repeating unit is a sulfonic acid-containing monomer present from 50% to 99.99% by weight of the reactants, and wherein the crosslinker comprises at least two olefinic bonds.

Abstract: A wellbore fluid and method of use including grafted block copolymer, wherein the grafted block copolymer comprises at least one poly(vinylaromatic) segment and at least one elastomeric segment. The elastomeric segment can be a polymer from conjugated diene monomers having 4-6 carbons atoms per molecule. The poly(vinylaromatic) segment can be a monovinyl aromatic polysegment. The block copolymers can be a hydrogenated poly(styrene-b-isoprene) (SEP), a hydrogenated poly(styrene-b-butadiene) (SEB), a hydrogenated poly(styrene-b-isoprene/butadiene) (SEEP), a hydrogenated poly(styrene-b-isoprene-b-styrene) (SEPS), a hydrogenated poly(styrene-b-butadiene-b-styrene) (SEBS), or a hydrogenated poly(styrene-b-isoprene/butadiene-b-styrene) (SEEPS).

Abstract: Systems and methods for drilling in a subterranean formation are disclosed. A method comprises providing a drilling fluid, wherein the drilling fluid comprises an aqueous fluid; a first polymer comprising 2-acrylamido-2-methylpropane sulfonic acid, vinylpyrrolidinone, pentaerythritol allyl ether, and methylenebisacrylamide; and a second polymer comprising acrylate, 2-acrylamido-2-methylpropane sulfonic acid, methacrylic acid, and allyloxy 2-hydroxy propane sulfonic acid. The method further comprises placing the drilling fluid into the subterranean formation and drilling a wellbore in the subterranean formation.

Abstract: A crosslinked polymer comprising reactants of a first repeating unit, a second repeating unit, and a crosslinker that react to form the crosslinked polymer, wherein the first repeating unit is a sulfonic acid-containing monomer present from 1% to 45% by weight of the reactants, wherein the second repeating unit is selected from the group consisting of an N-vinyl amide-contain ing monomer, a terminal double bond-containing monomer, and any combination thereof, and is present from 55% to 99% by weight of the reactants, and wherein the crosslinker comprises at least two olefinic bonds.

Abstract: Systems and methods for drilling in a subterranean formation are disclosed. A method comprises providing a drilling fluid, wherein the drilling fluid comprises an aqueous fluid; a first polymer comprising 2-acrylamido-2-methylpropane sulfonic acid, vinylpyrrolidinone, pentaerythritol allyl ether, and methylenebisacrylamide; and a second polymer comprising acrylate. 2-acrylamido-2-methylpropane sulfonic acid, methacrylic acid, and allyloxy 2-hydroxy propane sulfonic acid. The method further comprises placing the drilling fluid into the subterranean formation and drilling a wellbore in the subterranean formation.

Abstract: A crosslinked polymer comprising reactants of a first repeating unit, a second repeating unit, and a crosslinker that react to form the crosslinked polymer, wherein the first repeating unit is a sulfonic acid-containing monomer present from 50% to 99% by weight of the reactants, wherein the second repeating unit is selected from the group consisting of an N-vinyl amide-containing monomer, a terminal double bond-containing monomer, and any combination thereof, and is present from 1% to 50% by weight of the reactants, and wherein the crosslinker comprises at least two olefinic bonds, and is present in the range of about 9% to about 25% by weight of the reactants.

Abstract: A crosslinked polymer comprising reactants of a first repeating unit, a second repeating unit, a first crosslinker, and a second crosslinker that react to form the crosslinked polymer, wherein the first repeating unit is a sulfonic acid-containing monomer present from 50% to 99% by weight of the reactants, wherein the second repeating unit is selected from the group consisting of an N-vinyl amide-containing monomer, a terminal double bond-containing monomer, and any combination thereof, and is present from 1% to 50% by weight of the reactants, wherein the first crosslinker comprises at least two olefinic bonds, wherein the second crosslinker comprises at least two olefinic bonds, and wherein the first and second crosslinkers combined are present in the range of about 0.01% to about 25% by weight of the reactants.

Abstract: A method comprising introducing a treatment fluid into a subterranean formation, wherein the treatment fluid comprises a base fluid and a crosslinked polymer, the crosslinked polymer comprising reactants of a first repeating unit, a second repeating unit, and a crosslinker that react to form the crosslinked polymer, wherein the first repeating unit is a sulfonic acid-containing monomer present from 50% to 99% by weight of the reactants, wherein the second repeating unit selected from the group consisting of an N-vinyl amide-containing monomer, a terminal double bond-containing monomer, and any combination thereof, and is present from 1% to 50% by weight of the reactants, and wherein the crosslinker comprises at least two olefinic bonds.

Abstract: Various embodiments disclosed relate to crosslinked polymers including sulfonic acid groups or salts or esters thereof as viscosifiers and fluid loss additives for subterranean treatment. In various embodiments, the present invention provides a method of treating a subterranean formation. The method includes placing in a subterranean formation a composition including a crosslinked viscosifier polymer including an ethylene repeating unit including an —S(O)2OR1 group wherein at each occurrence R1 is independently chosen from —H, substituted or unsubstituted (C1-C20)hydrocarbyl, and a counterion.

Abstract: Crosslinked polymer additives that may be used as thinners and/or deflocculants in subterranean treatment fluids are provided. In one embodiment, the methods comprise: providing a treatment fluid comprising an aqueous base fluid, a viscosifying agent, and a crosslinked synthetic polymer that comprises a copolymer of at least a first monomer comprising 2-acrylamido-2-methylpropane sulfonic acid or any salt thereof, and a second monomer comprising an N-vinyl amide, and at least one crosslinking agent, wherein the average molecular weight of the crosslinked synthetic polymer is less than about 3,000,000 grams per mole; and introducing the treatment fluid into at least a portion of a well bore penetrating at least a portion of a subterranean formation.

Abstract: Various embodiments disclosed relate to compositions including a viscosifier polymer and a polyamine viscosity modifier and methods of using the same for treatment of subterranean formations. In various embodiments, the present invention provides a method of treating a subterranean formation. The method includes placing in a subterranean formation a composition including a viscosifier polymer and a polyamine viscosity modifier.

Abstract: Various embodiments disclosed relate to compositions including a viscosifier polymer and a polyamine viscosity modifier and methods of using the same for treatment of subterranean formations. In various embodiments, the present invention provides a method of treating a subterranean formation. The method includes placing in a subterranean formation a composition including a viscosifier polymer and a polyamine viscosity modifier.

Abstract: A polymer microsphere for use as a fluid loss additive in drilling muds including a hydrophobic core of hydrophobic monomers and a hydrophilic shell of hydrophilic monomers wherein the hydrophilic shell surrounds the hydrophobic core. The polymer microsphere is capable of forming micelles or microgels in water without using surfactants and can be block, graft, and random copolymers. The hydrophilic shell is physically or chemically linked to the hydrophobic core. The polymer microsphere further includes crosslinkers, preferably where the crosslinkers are monomers containing at least two ethylenically unsaturated groups.

Abstract: Crosslinked sulfonate-containing polymers may be stable in high density, monovalent brines, which may render such polymers particularly useful in drilling fluids in general and, especially, in the subclass of drilling fluids known as drill-in fluids. For example, a drilling fluid may include a crosslinked sulfonate-containing polymer dispersed in a monovalent brine having a density of about 8 lb/gal to about 20 lb/gal, wherein the crosslinked sulfonate-containing polymer comprises: reactants of a first repeating unit and a crosslinker that react to form the crosslinked sulfonate-containing polymer, wherein the first repeating unit is a sulfonic acid-containing monomer present from 50% to 99.99% by weight of the reactants, and wherein the crosslinker comprises at least two olefinic bonds.

Abstract: Various embodiments disclosed relate to compositions including a viscosifier polymer and a polyamine viscosity modifier and methods of using the same for treatment of subterranean formations. In various embodiments, the present invention provides a method of treating a subterranean formation. The method includes placing in a subterranean formation a composition including a viscosifier polymer and a polyamine viscosity modifier.