Water: Class II Class II Wells - Oil and Gas Related Injection
Wells (Class II) Class II Well Questions This page describes the
various types of Class II wells and their uses. It also explains
how the use of Class II wells protects drinking water resources,
and presents the UIC Program requirements for Class II wells to
ensure the protection of underground sources of drinking water
(USDWs). Class II Wells What is a Class II well? Class II wells
inject fluids associated with oil and natural gas production.
Most of the injected fluid is salt water (brine), which is
brought to the surface in the process of producing (extracting)
oil and gas. In addition, brine and other fluids are injected to
enhance (improve) oil and gas production. The approximately
144,000 Class II wells in operation in the United States inject
over 2 billion gallons of brine every day. Most oil and gas
injection wells are in Texas, California, Oklahoma, and Kansas.
What are the types of Class II wells? Three types of Class II
injection wells