Controlling the formation of polymer-metal complexes in wellbore operations
Treatment fluids and associated methods for treating a subterranean formation. An example method includes introducing a treatment fluid into a wellbore penetrating the subterranean formation. The treatment fluid includes a competitive metal binder selected from the group consisting of polyamino polyether methylene phosphonic acid, hydoxyethylamino-di(methylene phosphonic acid), and a combination thereof; a polymer capable of forming a polymer-metal complex; and an aqueous fluid. The method further includes contacting a metal ion with the treatment fluid after introduction of the treatment fluid into the wellbore and binding the metal ion with the competitive metal binder.
1. A treatment fluid composition comprising:
a competitive metal binder selected from the group consisting of polyamino polyether methylene phosphonic acid, hydoxyethylamino-di(methylene phosphonic acid), and a combination thereof; wherein the competitive metal binder is present in the treatment fluid at a concentration in a range of about 0.05% (w/w) to about 5% (w/w) and is configured to sequester a metal ion before the metal ion forms a polymer-metal complex with the polymer;
a polymer capable of forming the polymer-metal complex; wherein the polymer is anionic, cationic, or amphoteric; and
an aqueous fluid.
2. The treatment fluid composition of claim 1 , wherein the competitive metal binder comprises the polyamino polyether methylene phosphonic acid.
3. The treatment fluid composition of claim 1 , wherein the competitive metal binder comprises the hydoxyethylamino-di(methylene phosphonic acid).
4. The treatment fluid composition of claim 1 , wherein the polymer is a polyacrylamide.
5. The treatment fluid composition of claim 1 , wherein the polymer comprises a moiety selected from the group consisting of an acrylic acid moiety, a 2-acrylamido-2-methylpropane sulfonic acid moiety, a trimethyl aminoethyl acrylate moiety, a trimethyl aminoethyl methacrylate moiety, and any combination thereof.
6. The treatment fluid composition of claim 1 , wherein the polymer comprises an ethylene repeating unit including a —C(O)N(R 1 ) 2 group or a —C(O)OR 2 group, where at each occurrence, R 1 is independently selected from the group consisting of —H, —C 2 H 4 OH, —CH 3 , or —(CH 2 ) n CH 3 and where n=0 to 25, and at each occurrence, R 2 is independently selected from the group consisting of —H, a substituted or unsubstituted (C1-C20) hydrocarbyl, or a counterion selected from H, Li, Na, K, Cs, Be, Mg, Ca, Sr, Ba, Cr, Fe, Mn, Co, Ni, Cu, Ga, In, or NH4.
7. The treatment fluid composition of claim 1 , wherein the polymer is anionic.
8. A method for treating a subterranean formation, the method comprising:
introducing a treatment fluid into a wellbore penetrating the subterranean formation, the treatment fluid comprising:
a competitive metal binder selected from the group consisting of polyamino polyether methylene phosphonic acid, hydoxyethylamino-di(methylene phosphonic acid), and a combination thereof; wherein the competitive metal binder is present in the treatment fluid at a concentration in a range of about 0.05% (w/w) to about 5% (w/w);
a polymer capable of forming a polymer-metal complex; wherein the polymer is anionic, cationic, or amphoteric; and
an aqueous fluid;
contacting a metal ion with the treatment fluid after introduction of the treatment fluid into the wellbore;
binding the metal ion with the competitive metal binder; and
sequestering the metal ion before the metal ion forms the polymer-metal complex with the polymer.
9. The method of claim 1 , wherein the competitive metal binder comprises the polyamino polyether methylene phosphonic acid.
10. The method of claim 1 , wherein the competitive metal binder comprises the hydoxyethylamino-di(methylene phosphonic acid).
11. The method of claim 1 , wherein the treatment fluid is a fracturing fluid, acidizing fluid, polymer flooding fluid for enhanced oil recovery, or a fluid for coiled tubing milling.
12. The method of claim 1 , wherein the polymer is a polyacrylamide.
13. The method of claim 1 , wherein the polymer comprises a moiety selected from the group consisting of an acrylic acid moiety, a 2-acrylamido-2-methylpropane sulfonic acid moiety, a trimethyl aminoethyl acrylate moiety, a trimethyl aminoethyl methacrylate moiety, and any combination thereof.
14. The method of claim 1 , wherein the polymer comprises an ethylene repeating unit including a —C(O)N(R 1 ) 2 group or a —C(O)OR 2 group, where at each occurrence, R 1 is independently selected from the group consisting of —H, —C 2 H 4 OH, —CH 3 , or —(CH 2 ) n CH 3 and where n=0 to 25, and at each occurrence, R 2 is independently selected from the group consisting of —H, a substituted or unsubstituted (C1-C20) hydrocarbyl, or a counterion selected from H, Li, Na, K, Cs, Be, Mg, Ca, Sr, Ba, Cr, Fe, Mn, Co, Ni, Cu, Ga, In, or NH 4 .
15. The method of claim 1 , wherein the polymer is anionic.
16. The method of claim 1 , wherein the metal ion is Fe 2+ , Fe 3+ , Cr 3+ , Cr 4+ , Al 3+ , Sb 5+ , Ti 4+ , Zr 4+ , or any combination thereof.
17. A system for treating a subterranean formation, the system comprising:
a treatment fluid composition comprising:
a competitive metal binder selected from the group consisting of polyamino polyether methylene phosphonic acid, hydoxyethylamino-di(methylene phosphonic acid), and a combination thereof; wherein the competitive metal binder is present in the treatment fluid at a concentration in a range of about 0.05% (w/w) to about 5% (w/w) and is configured to sequester a metal ion before the metal ion forms a polymer-metal complex with a polymer;
the polymer capable of forming the polymer-metal complex; wherein the polymer is anionic, cationic, or amphoteric; and
an aqueous fluid; and
mixing equipment configured to mix the competitive metal binder, the polymer, and the aqueous fluid; and
a pump fluidly coupled to a tubular extending into a wellbore penetrating the subterranean formation, wherein the tubular is configured to circulate or otherwise convey the treatment fluid composition in the wellbore.
18. The system of claim 17 , wherein the polymer is a polyacrylamide.
19. The system of claim 17 , wherein the polymer comprises a moiety selected from the group consisting of an acrylic acid moiety, a 2-acrylamido-2-methylpropane sulfonic acid moiety, a trimethyl aminoethyl acrylate moiety, a trimethyl aminoethyl methacrylate moiety, and any combination thereof.
20. The system of claim 17 , wherein the tubular comprises a portion that is rusted, wherein the rusted portion of the tubular is located such that the treatment fluid composition contacts the rusted portion as the treatment fluid composition is circulated in the tubular.