Method for the use of nitrates and nitrate reducing bacteria in hydraulic fracturing
View Patent ↗A slick water fracturing fluid including a brine, an inorganic nitrate, a nitrogen reducing bacteria, a scale inhibitor selected from the group consisting of a polyacrylate polymer, a polyacrylate copolymer, a polyacrylate terpolymer, and mixtures thereof, and a friction reducer, wherein the friction reducer is a polyacrylamide.
1. A method of controlling sulfides in a low permeability subterranean formation, comprising:
injecting an inorganic nitrate into the low permeability subterranean formation; and
injecting nitrogen reducing bacteria into the low permeability subterranean formation.
2. 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 mixtures thereof.
3. The method of claim 2 wherein nitrogen reducing bacteria is Nitrobacter vulgaris, Nitrosomonas europea, Pseudomonas stutzeri, Pseudomonas aeruginosa, Paracoccus denitrificans, Sulfurospirillum deleyianum , and Rhodobacter sphaeroides.
4. The method of claim 1 wherein the inorganic nitrate is selected from the group consisting of potassium nitrate, sodium nitrate, ammonium nitrate, and mixtures thereof.
5. The method of claim 1 wherein no significant amount of a biocide is introduced into the low permeability subterranean formation.