Wellbore fluid additives and methods of producing the same

摘要

Disclosed herein is a polymer useful in a method of forming a wellbore fluid additive. This polymer comprises a polyethylene backbone comprising pendant aminoalkylsulfonic acid amides which comprise a carbonyl directly attached to a backbone carbon, and an amide formed via the amine group from the aminoalkylsulfonic acid. Methods of preparing these polymers by addition of the aminoalkylsulfonic acid to a polymeric anhydride are disclosed. Methods related to oil extraction using the wellbore fluid with the additive are also disclosed.

主权项

1. A method of forming a wellbore fluid additive, the method comprising reacting an optionally substituted C2-4 aminoalkylsulfonic acid and a polymer comprising the following two types of repeat units: wherein R1 is optionally substituted C10-28 alkyl; and R2 and R3 are independently hydrogen, optionally substituted C1-12 alkyl, optionally substituted C6-10 aryl, optionally substituted C6-10 heteroaryl, halo, OH, SH, C0-12 amino, C1-12 alkoxy, C1-12 alkyl sulfide, or C1-12 acyloxy; wherein the reacting occurs in a mixture of solvents further comprising a dipolar aprotic solvent, and water; wherein at least about 1% by weight of water is added to the dipolar aprotic solvent and wherein the optionally substituted C2-4 aminoalkylsulfonic acid is reacted with a base in an amount of 0.8 equivalents to 2.5 equivalents per mole of optionally substituted C2-4 aminoalkylsulfonic acid prior to and/or simultaneously with reaction with the polymer.