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. An aqueous drilling fluid composition comprising:
water, and
effective amount of a corrosion control system including:
from about 1.25 ppm to about 5 wt. % of an anionic scale inhibitor selected from the group consisting of:
(a) alkali metal, alkaline earth metal, or transition metal salts of alkyl phosphate esters;
(b) alkali metal, alkaline earth metal, or transition metal salts of alkoxy phosphate esters;
(c) alkali metal, alkaline earth metal, or transition metal salts of glycol phosphate esters;
(d) alkali metal, alkaline earth metal, or transition metal salts of alkylpolyols phosphate esters, and
(e) mixtures or combinations thereof,
from about 0.25 wt. % to about 10 wt. % of a cationic acid inhibitor or dispersant,
from about 0.1 wt. % of a noxious species inhibitor up to about a 10:1 ratio of the noxious species inhibitor to noxious species in the fluid to be treated, and
from about 1 to 10 lbs per barrel of a lime slurry or hot lime,
where the effective amount is between about 0.1% v/v to about 5% v/v, where the system reduces or prevents corrosion of metallic surfaces in contact with the aqueous drilling fluid composition, and where the aqueous drilling fluid composition is effective over a temperature range between about 100° F. and about 600° F.
2. The composition of claim 1 , further comprising:
a density reduction additive,
a shale inhibitor, and/or
a pH modifier selected from the group consisting of alkali hydroxides, alkali carbonates, alkali bicarbonates, alkaline earth metal hydroxides, alkaline earth metal carbonates, alkaline earth metal bicarbonates and mixtures or combinations thereof.
3. The composition of claim 2 , wherein the pH modifier is present in an amount sufficient to adjust the composition to a pH of about 10.0.
4. The composition of claim 1 , wherein:
the cationic acid inhibitor comprises 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, and
the noxious species inhibitor or scavenger comprises aldehyde-amine adducts, triazines, or mixtures and combinations thereof.
5. A corrosion control composition comprising:
from about 1.25 ppm to about 5 wt. % of an anionic scale inhibitor selected from the group consisting of:
(a) alkali metal, alkaline earth metal, or transition metal salts of alkyl phosphate esters;
(b) alkali metal, alkaline earth metal, or transition metal salts of alkoxy phosphate esters;
(c) alkali metal, alkaline earth metal, or transition metal salts of glycol phosphate esters;
(d) alkali metal, alkaline earth metal, or transition metal salts of alkylpolyols phosphate esters, and
(e) mixtures or combinations thereof,
from about 0.25 wt. % to about 10 wt. % of a cationic acid inhibitor or dispersant,
from about 0.1 wt. % of a noxious species inhibitor up to about a 10:1 ratio of the noxious species inhibitor to noxious species in the fluid to be treated, and
from about 1 to 10 lbs per barrel of a lime slurry or hot lime,
where the composition reduces or prevents corrosion of metallic surfaces in contact with a fluid containing the composition system and where the composition is effective over a temperature range between about 100° F. and about 600° F.
6. The composition of claim 5 , further comprising:
a density reduction additive,
a shale inhibitor, and/or
a pH modifier is selected from the group consisting of alkali hydroxides, alkali carbonates, alkali bicarbonates, alkaline earth metal hydroxides, alkaline earth metal carbonates, alkaline earth metal bicarbonates and mixtures or combinations thereof.
7. The composition of claim 6 , wherein the pH modifier is present in an amount sufficient to adjust the composition to a pH of about 10.0.
8. The composition of claim 5 , wherein the fluid comprises a drilling fluid, a completion fluid, production fluid, a fracturing fluid or a second oil recovery fluid.
9. The composition of claim 5 , wherein:
the cationic acid inhibitor comprises 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, and
the noxious species inhibitor or scavenger comprises aldehyde-amine adducts, triazines, or mixtures or combinations thereof.
10. A water-base drilling fluid composition for use in drilling wells through a formation containing a clay which swells in the presence of water, the drilling fluid comprising:
(a) a weight material selected from the group consisting of barite, hematite, iron oxide, calcium carbonate, magnesium carbonate, and combinations thereof;
(b) an anionic polymer;
(c) a suspending agent selected from the group consisting of bentonite, polymeric suspending agent (xanthate gum or other gums), partially hydrolyzed polyacrylamide; and
(d) an effective amount of a corrosion control system comprising:
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,
from about 0.25 wt. % to about 10 wt. % of a cationic acid inhibitor or dispersant,
from about 0.1 wt. % of a noxious species inhibitor up to about a 10:1 ratio of the noxious species inhibitor to noxious species in the fluid to be treated, and
from about 1 to 10 lbs per barrel of a lime slurry or hot lime,
(e) a shale inhibitor,
where the effective amount is between about 0.1% v/v to about 5% v/v, where the system reduces or prevents corrosion of metallic surfaces in contact with the fluid, and where the composition is effective over a temperature range between about 100° F. and about 600° F.
11. The composition of claim 10 , further comprising:
a density reduction additive, and/or
a pH modifier selected from the group consisting of alkali hydroxides, alkali carbonates, alkali bicarbonates, alkaline earth metal hydroxides, alkaline earth metal carbonates, alkaline earth metal bicarbonates and mixtures or combinations thereof.
12. The composition of claim 11 , wherein the pH modifier is present in an amount sufficient to adjust the composition to a pH of about 10.0.
13. The composition of claim 10 , wherein:
the cationic acid inhibitor comprises 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, and
the noxious species inhibitor or scavenger comprises aldehyde-amine adducts, triazines, or mixtures or combinations thereof.