Corrosion inhibitor systems for low, moderate and high temperature fluids and methods for making and using same
View Patent ↗A corrosion control system is disclosed including an anionic oxygen inhibitor, a cationic acid inhibitor or dispersant, and a noxious species inhibitor or scavenger for use in a fluid in contact with a metallic surface at low temperature, moderate temperature and especially at high temperature. A drilling fluid, a completion fluid, a production fluid and a geothermal fluid including an effective amount of the corrosion control system is also disclosed as well as methods for making and using same.
1. A method comprising the step of:
adding an effective amount of an aqueous-based corrosion control system to a fluid in contact with a metallic surface, where the system comprises:
an anionic scale inhibitor selected from the group consisting of: (1) alkali metal, alkaline earth metal, or transition metal salts of alkyl phosphate esters; (2) alkali metal, alkaline earth metal, or transition metal salts of alkoxy phosphate esters; (3) alkali metal, alkaline earth metal, or transition metal salts of glycol phosphate esters; (4) alkali metal, alkaline earth metal, or transition metal salts of alkylpolyols phosphate esters and (5) mixtures or combinations thereof,
a cationic acid inhibitor or dispersant,
an inhibitor or scavenger of noxious sulfur-containing compounds comprising aldehyde-amine adducts, triazines, or mixtures or combinations thereof,
a lime slurry or hot lime in an amount from about 1 to 10 lbs per barrel of the system, and
water,
where the composition is effective over a temperature range between about 100° F. and about 600° F. including a low temperature range between about 100° F. and about 250° F., a moderate temperature range between about 250° F. and about 450° F., and a high temperature range between about 450° F. and about 600° F.
2. The method of claim 1 , wherein the anionic scale inhibitor comprises alkali metal, alkaline earth metal, or transition metal salts of alkyl phosphate esters or mixtures or combinations thereof.
3. The method of claim 1 , wherein the anionic scale inhibitor comprises alkali metal, alkaline earth metal, or transition metal salts of alkoxy phosphate esters or mixtures or combinations thereof.
4. The method of claim 1 , wherein the system further includes:
pH modifier.
5. The method of claim 4 , wherein the pH modifier is selected from the group consisting of KOH, NaOH, Ca(OH) 2 , CaO, Na 2 CO 3 , NaHCO 3 , MgO, Mg(OH) 2 and mixtures thereof.
6. The method of claim 1 , wherein the system has a pH of about 10.0.
7. The method of claim 1 , wherein the cationic acid inhibitor comprises a quinoline quaternary surfactant.
8. The method of claim 1 , wherein the system further includes:
a shale inhibitor.
9. The method of claim 1 , wherein the anionic scale inhibitor comprises alkali metal, alkaline earth metal, or transition metal salts of glycol phosphate esters or mixture or combinations thereof.
10. The method of claim 1 , wherein the anionic scale inhibitor comprises alkali metal, alkaline earth metal, or transition metal salts of alkypolyol phosphate esters or mixture or combinations thereof.
11. A method comprising the step of:
adding an effective amount of a corrosion control system to a fluid in contact with a metallic surface, where the system comprises:
an anionic scale inhibitor including alkali metal, alkaline earth metal, or transition metal salts of alkyl phosphate esters, alkali metal, alkaline earth metal, or transition metal salts of alkoxy phosphate esters, alkali metal, alkaline earth metal, or transition metal salts of glycol phosphate esters, alkali metal, alkaline earth metal, or transition metal salts of alkylpolyol phosphate esters or mixture or combinations thereof,
a cationic acid inhibitor or dispersant,
a inhibitor or scavenger of noxious sulfur-containing compounds comprising aldehyde-amine adducts, triazines, or mixtures or combinations thereof,
a lime slurry or hot lime in an amount from about 1 to 10 lbs per barrel of the system, and
water,
where the composition is effective over a temperature range between about 100° F. and about 600° F. including a low temperature range between about 100° F. and about 250° F., a moderate temperature range between about 250° F. and about 450° F., and a high temperature range between about 450° F. and about 600° F.
12. The method of claim 11 , wherein the anionic scale inhibitor comprises alkali metal, alkaline earth metal, or transition metal salts of alkyl phosphate ester, or mixtures or combinations thereof.
13. The method of claim 11 , wherein the anionic scale inhibitor comprises alkali metal, alkaline earth metal, or transition metal salts of alkoxy phosphate esters or mixtures or combinations thereof.
14. The method of claim 11 , wherein the anionic scale inhibitor comprises alkali metal, alkaline earth metal, or transition metal salts of glycol phosphate esters or mixtures or combinations thereof.
15. The method of claim 11 , wherein the anionic scale inhibitor comprises alkali metal, alkaline earth metal, or transition metal salts of alkylpolyol phosphate esters or mixtures or combinations thereof.
16. The method of claim 11 , wherein the cationic acid inhibitor comprises a quinoline quaternary surfactant.
17. The method of claim 11 , wherein the system further includes:
pH modifier and/or a shale inhibitor.
18. The method of claim 17 , wherein the pH modifier is selected from the group consisting of KOH, NaOH, Ca(OH) 2 , CaO, Na 2 CO 3 , NaHCO 3 , MgO, Mg(OH) 2 and combination there of.
19. The method of claim 11 , wherein the system has a pH of about 10.0.
20. A method comprising the step of:
adding to a fluid in contact with a metallic surface an effective amount of a corrosion control system comprising:
from about 1.25 ppm to about 5 wt. % of an anionic scale inhibitor comprising alkali metal, alkaline earth metal, or transition metal salts of an alkyl phosphate estes, alkali metal, alkaline earth metal, or transition metal salts of alkoxy phosphate ester, alkali metal, alkaline earth metal, or transition metal salts of glycol phosphate esters, alkali metal, alkaline earth metal, or transition metal salts of alkylpolyol phosphate esters or mixtures or combinations thereof,
from about 0.25 wt. % to about 10 wt. % of a cationic acid inhibitor or dispersant comprising quaternary ammonium salts, salts of nitrogen bases, or mixtures or combinations thereof, where the salt is selected from the group consisting of chloride, bromide, iodide, dimethylsulfate, diethylsulfate, nitrite, hydroxide, alkoxides, and mixtures or combinations thereof,
from about 0.1 wt. % up to about a 10:1 ratio of an inhibitor or scavenger of noxious sulfur-containing compounds comprising aldehyde-amine adducts, triazines, or mixtures or combinations thereof, based on a concentration of the noxious sulfur species such as H 2 S in ppm in the fluid to be treated,
from about 1 to 10 lbs per barrel of a lime slurry or hot lime, and
a balance being deionized water,
where the effective amount is sufficient to reduce corrosion of metal in contact with the fluid and where the system is effective at temperatures between about 250° F. and about 600° F. and has a pH of about 10.0.
21. The method of claim 20 , wherein the system further includes:
pH modifier and/or a shale inhibitor.
22. The method of claim 21 , wherein the pH modifier is selected from the group consisting of KOH, NaOH, Ca(OH) 2 , CaO, Na 2 CO 3 , NaHCO 3 , MgO, Mg(OH) 2 and mixtures thereof.