Use of multiple charged cationic compounds derived from polyamines for clay stabilization in oil and gas operations
AssigneeChampionX USA Inc.
InventorsAshish Dhawan, Kellen Harkness, Carter M. Silvernail, Keith A. Monk
Life of this patent
Estimating the term…
Abstract
Methods of using specific multiple charged cationic compounds, which are derived from polyamines through an aza-Michael addition with an α, β-unsaturated carbonyl compound, in a clay treatment composition to reduces clay swelling, clay migration, and sludge formation in a subterranean formation in oil and gas operations are provided. The disclosed methods or compositions are found to be more effective than those methods or compositions including commonly used for reducing clay swelling, clay migration, and sludge formation.
Claims24
A method of stabilizing swellable clays and/or reducing formation of sludge in a subterranean formation comprising:
- providing a clay treatment composition into a subterranean formation,
- wherein the clay treatment composition comprises a compound or its salt derived from an aza-Michael Addition Reaction between a polyamine and an α, β-unsaturated carbonyl compound according to the following formula
- and
- one or more clay treatment composition agents,
- wherein:
- X is NH or O;
- R2 is H, CH3, or an unsubstituted, linear or branched C2-C10 alkyl, alkenyl, or alkynyl group;
- R3 is absent or an unsubstituted, linear C1-C30 alkylene group;
- Y is —NR4R5R6(+) or a salt thereof,
- wherein (A) R4, R5, and R6 are independently CH3;
- (B) R4 and R5 are independently CH3, and R6 is a C2-C12 aromatic alkyl;
- or (C) R4 and R5 are independently CH3, and R6 is —CH2—C6H6,
- wherein the compound is a multiple charged cationic compound having 2 or more positive charges;
- and
- wherein the clay treatment composition stabilizes swellable clays and/or reduces formation of sludge.
Dependencies are inferred from the claim text.