Definition - What does Water Flood mean?
Water Flood is a method used to increase the pressure and production of a reservoir by injecting water into the reservoir. The use of water to increase oil production is known as secondary recovery and commonly follows primary production that uses the natural energy of the reservoir to produce oil. The water injected supports the pressure of the reservoir and displaces oil from the reservoir and pushes it toward the well. The main reason for using this method is to stimulate and increase the production rate of oil and oil recovery.
Petropedia explains Water Flood
Water Flood can be achieved by injecting water to increase reservoir pressure to the initial level. The oil is displaced by water from pore spaces, but the efficiency of this displacement relies upon various factors such as rock characteristics and oil viscosity. It is a dynamic process in which the production of a well responds to injection of water and can be enhanced by modification of operations. It is effective as almost all reservoir rocks are mixed when wet or water wet. The process has various complicated factors and is not always considered as the best technology to be used. The technique also includes inefficient recovery because of variable permeability or other similar conditions that affect the fluid transport in the reservoir.