Method for control of deleterious microbes in oil and gas and other industrial fluids
View Patent ↗A method of controlling sulfides in water systems is disclosed which includes injecting 9,10 anthraquinone into the water system and injecting a nitrate or nitrite into the water system.
1. A method comprising: injecting 9,10 anthraquinone into a water system; injecting a nitrate or nitrite into the water system; injecting nitrogen reducing bacteria into the water system; and injecting a molybdate or molybdate salt into the water system.
2. The method of claim 1 , wherein the 9,10 anthraquinone is continuously injected or periodically injected at a pre-set frequency.
3. The method of claim 1 , wherein the nitrate or nitrite is injected at a pre-set frequency in an amount sufficient to achieve a concentration of less than 2000 ppm by weight in the water system.
4. The method of claim 2 , wherein the nitrate or nitrite is continuously injected in an amount to achieve a concentration of less than 500 ppm by weight in the water system.
5. The method of claim 1 , wherein the nitrate or nitrite is inorganic.
6. The method of claim 3 , wherein the nitrate is selected from the group consisting of: potassium nitrate, sodium nitrate, ammonium nitrate, and any combination thereof.
7. The method of claim 3 , wherein the nitrite is potassium nitrite or sodium nitrite.
8. The method of claim 1 wherein the nitrogen reducing bacteria is selected from the group consisting of: Campylobacter sp., Nitrobacter sp., Nitrosomonas sp., Thiomicrospira sp., Sulfurospirillum sp., Thauera sp., Paracoccus sp., Pseudomonas sp., Rhodobacter sp., Desulfovibrio sp., and any combination thereof.
9. The method of claim 8 wherein the nitrogen reducing bacteria is selected from the group consisting of: Nitrobacter vulgaris, Nitrosomonas europea, Pseudomonas stutzeri, Pseudomonas aeruginosa, Paracoccus denitrificans, Sulfurospirillum deleyianum, Rhodobacter sphaeroides , and any combination thereof.
10. The method of claim 1 , wherein the nitrogen reducing bacteria is injected in an amount to achieve a concentration of between 10 and 10 8 nitrogen reducing bacteria count/ml in the water system.
11. The method of claim 1 wherein the molybdate salt is selected from the group consisting of: sodium molybdate, lithium molybdate, and any combination thereof.
12. The method of claim 1 , wherein the amount of molybdate or molybdate salt added is sufficient to achieve a concentration of 5 to about 100 ppm by weight in the water system.
13. The method of claim 1 , wherein the 9,10-anthraquinone is added in quantities sufficient to achieve a concentration of between 5 ppm and 1000 ppm by weight in the water system.
14. A method comprising: injecting 9,10 anthraquinone into an oilfield water system; injecting a nitrate or nitrite into the oilfield water system; injecting nitrogen reducing bacteria into the oilfield water system; and injecting a molybdate or molybdate salt into the oilfield water system.
15. The method of claim 14 wherein the nitrogen reducing bacteria is selected from the group consisting of: Campylobacter sp., Nitrobacter sp., Nitrosomonas sp., Thiomicrospira sp., Sulfurospirillum sp., Thauera sp., Paracoccus sp., Pseudomonas sp., Rhodobacter sp., Desulfovibrio sp., and any combination thereof.
16. The method of claim 14 wherein the nitrogen reducing bacteria is selected from the group consisting of: Nitrobacter vulgaris, Nitrosomonas europea, Pseudomonas stutzeri, Pseudomonas aeruginosa, Paracoccus denitrificans, Sulfurospirillum deleyianum, Rhodobacter sphaeroides , and any combination thereof.