DeepRock • InjectionWellFacts.com
How Injection Wells Work
Ohio’s deep Class II injection wells place fluids thousands of feet below drinking water, behind layers of steel and cement. This visual guide walks through what injection wells are, how they’re built, and how the injected fluids stay trapped in the rock.
Used worldwide
Engineered safety layers
Deep geologic confinement
What are injection wells?
Millions of deep wells around the world place fluids safely underground, far below aquifers
in rock layers selected and approved by geologists and regulators.
Well structure
Surface casing, cement, production casing, tubing, packer, and a monitored annulus create
multiple barriers between injected fluid and groundwater.
What is injected?
Flowback water from fracking, produced water (salty brine), and small amounts of additives
are moved from treatment facilities into approved injection zones.
Underground layers