Quaternary nitrogen containing amphoteric water soluble polymers and their use in drilling fluids
AssigneeAkzo Nobel N.V.
InventorsBrent Warren, Peter M. van der Horst, Theodorus A. van't Zelfde
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Abstract
Water based drilling fluid compositions which contain at least one viscosity builder and at least one rheological control agent wherein the rheological control agent is an amphoteric polymer, the cationic groups of the amphoteric polymer being quaternary ammonium groups.
Claims32
A water-based drilling fluid composition which comprises water, at least one viscosity builder and at least one rheological control agent, the rheological control agent being an amphoteric polymer having cationic groups in the form of quaternary ammonium groups, the amphoteric polymer comprising a quaternary ammonium compound of the formula:
- wherein R1 is H or OH, R2, R3 and R4are the same or different and are selected from the group consisting of C1-C2, alkyl, C6-C24 aryl, C7-C24 aralkyl, C7-C24 alkaryl, C3-C24 cycloalkyl, C2-C24 alkoxyalkyl and C7-C24 alkoxyaryl groups, or R2, R3, R4 and the quaternary nitrogen atom form an aliphatic or aromatic heterocyclic ring;
- n is an integer of 1 to 4, B is O, OC(O), C(O)O, C(O)—NH, NHC(O), S, OSO3, OPO3, NH, or NR5 where R5 is a C2-C6 acyl, or a C1-C4 alkyl radical, (A)m is an anionic water-soluble polysaccharide or substituted polysaccharide, m is greater than 10 and X− is an anion.
A water-based drilling fluid composition which comprises water, at least one viscosity builder and at least one rheological control agent, the rheological control agent being an amphoteric polymer having cationic groups in the form of quaternary ammonium groups, the amphoteric polymer comprising a quaternary ammonium compound of the formula:
- wherein R1 is H or OH, R2, R3, R4 and the quaternary nitrogen atom form a pyridinium ring;
- n is an integer of 1 to 4, B is O, OC(O), C(O)O, C(O)—NH, NHC(O), S, OSO3, OPO3, NH, or NR5 where R5 is a C2-C6 acyl, or a C1-C4 alkyl radical, (A)m is an anionic water-soluble polysaccharide or substituted polysaccharide, m is greater than 10 and X− is an anion.
A water-based drilling fluid composition which comprises water, at least one viscosity builder and at least one rheological control agent, the rheological control agent being an amphoteric synthetic polymer derived from copolymerizing an anionic synthetic monomer, a quaternary nitrogen atom containing cationic monomer, and optionally at least one nonionic monomer, said amphoteric polymer being selected from the group consisting of (partially) hydrolyzed polyacrylamide containing quaternary ammonium groups, polyacrylate containing quaternary ammonium groups, and (partially) hydrolyzed polyacrylamide containing quaternary ammonium groups copolymerized with acrylate monomers and mixtures thereof.
A method of enhancing the rheological behavior of a water-based drilling fluid composition which comprises adding to said composition a rheological enhancing effective amount of at least one amphoteric polymer, the amphoteric polymer comprising a quaternary ammonium compound of the formula:
- wherein R1 is H or OH, R2, R3 and R4are the same or different and are selected from the group consisting of C1-C_alkyl C6-C24 aryl, C7-C24 aralkyl, C7-C24 alkaryl, C3-C24 cycloalkyl, C2-C24 alkoxyalkyl and C7-C24 alkoxyaryl groups, or R2, R3, R4 and the quaternary nitrogen atom form an aliphatic or aromatic heterocyclic ring;
- n is an integer of 1 to 4, B is O, OC(O), C(O)O, C(O)—NH, NHC(O), S, OSO3, OPO3, NH, or NRR where R5 is a C2-C6 acyl, or a C1-C4 alkyl radical, (A)m is an anionic water-soluble polysaccharide or substituted polysaccharide, m is greater than 10 and X− is an anion.
A method of enhancing the rheological behavior of a water-based drilling fluid composition which comprises adding to said composition a rheological enhancing effective amount of at least one amphoteric polymer, said amphoteric polymer being selected from the group consisting of (partially) hydrolyzed polyacrylamide containing quaternary ammonium groups, polyacrylate containing quaternary ammonium groups, and (partially) hydrolyzed polyacrylamide containing quaternary ammonium groups copolymerized with acrylate monomers and mixtures thereof.
Dependencies are inferred from the claim text.