Composition and methods for inhibiting corrosion of metal during acidizing a wellbore in a subterranean formation for fracking
View Patent ↗An acid composition for acidizing a wellbore including at least one acid, an alkenylphenone, and a polycyclic diquaternary quinoxaline, and a method using the acid composition to reduce corrosion within a wellbore. The polycyclic diquaternary quinoxaline having the structure: where X − comprises a counter anion, R′ comprises an alkyl aryl group, and R 1 , R 2 , R 3 , R 4 and R 5 comprise hydrogen or a substitution group, the alkenylphenone the general structure: where R 1 is an unsubstituted or an inertly substituted aryl having 6 carbon atoms to 10 carbon atoms, and R 2 can be a substituted or unsubstituted C 1 -C 6 alkyl group.
1 . An acid composition for acidizing a wellbore, the composition comprising:
at least one acid;
an effective amount of an alkenylphenone;
an effective amount of polycyclic diquaternary quinoxaline;
the polycyclic diquaternary quinoxaline having the general structure:
where X − comprises a counter anion,
R′ comprises an alkyl aryl group, and
R 1 , R 2 , R 3 , R 4 and R 5 comprise hydrogen or a substitution group;
the alkenylphenone having the general structure:
where R 1 is an unsubstituted or an inertly substituted aryl having 6 carbon atoms to 10 carbon atoms, and
R 2 can be a substituted or unsubstituted C 1 -C 6 alkyl group.
2 . The acid composition according to claim 1 , wherein the alkyl aryl group is selected from at least one of benzyl, benzoyl, vinylbenzyl and methyl naphthalene.
3 . The acid composition according to claim 1 , wherein R 1 , R 2 , R 3 , R 4 and R 5 comprise substitution groups selected from: halo, alkyl, aryl and alkyl aryl.
4 . The acid composition according to claim 1 , wherein the acid composition comprises from 0.5 parts by weight to 5.0 parts by weight of the polycyclic diquaternary quinoxaline for every 1.0 part by weight of the alkenylphenone.
5 . The acid composition according to claim 1 , wherein the acid composition comprises from 0.5 parts by weight to 2.0 parts by weight of the polycyclic diquaternary quinoxaline for every 1.0 part by weight of the alkenylphenone.
6 . The acid composition according to claim 1 , wherein the counter anion comprises at least one of a chloride, bromide and iodide.
7 . The acid composition according to claim 1 , further comprising an intensifier selected from at least one of an iodide donor, an aldehyde and formic acid.
8 . The acid composition according to claim 1 , wherein the polycyclic diquaternary quinoxaline comprises dibenzyl diquaternary quinoxaline having the general structure:
wherein X − comprises a counter anion.
9 . The acid composition according to claim 1 , further comprising at least one of a surfactant and hydrotrope.
10 . The acid composition according to claim 9 , wherein the surfactant comprises an ethoxylate alcohol have from 16-18 carbon atoms in an alkyl chain.
11 . The acid composition according to claim 1 , wherein the acid comprises 15 wt % HCl.
12 . The acid composition according to claim 1 , wherein the acid comprises a synthetic acid.
13 . The acid composition according to claim 1 , wherein the acid comprises a mineral acid selected from at least one of hydrochloric acid, hydrofluoric acid, sulfuric acid and nitric acid.
14 . The acid composition according to claim 1 , wherein the acid comprises an amount ranging from 5 to 28 wt %.
15 . The acid composition according to claim 1 , wherein the composition is diluted with water at a point-of-use to achieve a ratio of composition and water of 1:1 respectively.
16 . The acid composition according to claim 1 , wherein the composition is diluted with water at the point-of-use to achieve a ratio of composition and water of 1:2 respectively.
17 . An inhibited acid composition compatible with stainless steel tankers for transporting the inhibited acid composition, the composition comprising:
an acid;
an effective amount of alkenylphenone;
an effective amount of polycyclic diquaternary quinoxaline, and
wherein the inhibited acid composition is transported in stainless steel tankers,
wherein the alkenylphenone having the general structure:
where R 1 is an unsubstituted or an inertly substituted aryl having 6 carbon atoms to 10 carbon atoms and R 2 can be a substituted or unsubstituted C 1 -C 6 alkyl group;
the polycyclic diquaternary quinoxaline having the general structure:
wherein X − comprises a counter anion,
R′ comprises an alkyl aryl group, and
R 1 , R 2 , R 3 , R 4 and R 5 comprise hydrogen or a substitution group.