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- The U.S. Environmental Protection Agency (EPA) defines an injection well as "a bored, drilled, or driven shaft, or a dug hole that is deeper than it is wide, or an improved sinkhole, or a subsurface fluid distribution system".
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Aug 1, 2023 · Definition of injection well. An injection well is used to place fluid underground into porous geologic formations. These underground formations may range from deep sandstone or limestone, to a shallow soil layer. Injected fluids may include water, wastewater, brine (salt water), or water mixed with chemicals.
The U.S. Environmental Protection Agency (EPA) defines an injection well as "a bored, drilled, or driven shaft, or a dug hole that is deeper than it is wide, or an improved sinkhole, or a subsurface fluid distribution system". Well construction depends on the injection fluid injected and depth of the injection zone.
Underground injection is the placement of fluids into the subsurface through a properly constructed well. Many of the wells used for injection are “high tech” in their construction and some are used for purposes other than waste disposal such as Enhanced Oil Recovery (EOR) , mineral mining, groundwater sustainability, and others.
Mar 12, 2024 · A Class V well is used to inject non-hazardous fluids underground. Fluids are injected either into or above an underground source of drinking water. Class V wells include any wells that are not already classified as Classes I-IV or Class VI wells. This diverse group ranges from simple shallow wells to complex experimental injection technologies.
- Industrial and municipal waste disposal. These wells are used to dispose of hazardous and non-hazardous waste in very deep rock formations, typically thousands of feet below the surface.
- Oil- and gas-related injection wells. This large category includes wells used to inject fluids associated with oil and gas production. There are roughly 180,000 Class II wells in the United States, which fall into three sub-categories
- Injection wells for solution mining. These wells are used to inject fluids that dissolve minerals, allowing the dissolved material to then be pumped to the surface and extracted.
- Shallow hazardous and radioactive injection wells. These wells were used to dispose of radioactive or hazardous waste into or above freshwater aquifers.
Apr 12, 2024 · Last updated on April 12, 2024. This webpage provides information on the types and number of injection wells of injection wells in the U.S., and information on well injection inspection and compliance.
Injection wells are used for additional purposes that are not associated with water, such as carbon sequestration; injection of hazardous, radioactive, and nonhazardous wastes; injection of fluids for mineral solution mining and oil recovery (fracking); and injection of media for remedial action.
