Water injection or water flooding refers to the method in the oil industry where water is injected into the reservoir, usually to increase pressure and thereby stimulate production. Water injection wells can be found both on- and offshore, to increase oil recovery from an existing reservoir.

Extracting more oil from the reservoirs is a major challenge for all operators. An effective and economical way to boost oil recovery is to inject seawater and/or produced water into the reservoir to maintain pressure and produce more oil using a Water Injection Pump.