Class II Injection Wells
The Preferred Way to Protect Water Sources, the Environment, and our Communities
UIC Injection Wells across the nation safely dispose of millions of gallons of brine obtained during oil and natural gas production. They return produced fluids brought to the earth’s surface during production back to where it came from. Safe disposal of the production brine from oil and gas production is crucial to environmental protection and energy production.
Why We Need Injection Wells
During oil and natural gas production brine is brought to the earth’s surface with oil or natural gas. Injection returns this saltwater back into the strata where it naturally occurs.
What Injection Wells Are
Injection Wells are drilled deep into the earth, and inject wastewater far below the freshwater aquifers and separated by confining geologic layers within the earth. Steel casing is run to the bottom of the hole. The casing is grouted in place with special cement. The casing isolates injection fluids from the well bore and from freshwater.
Drilling then continues below the casing down through the injection zone and casing is again cemented to the injection run. Injection fluids are pumped through another string of pipe called tubing. An injection packer is used near the bottom of the tubing to seal it against the casing. This packer prevents water from entering the space between the tubing and casing when water is injected. The pressure on the tubing annulus is continuously monitored to ensure there are no leaks.