Synonym: WaterFlood Recovery = WaterFlooding
One of the Reservoir flow drive mechanisms and Recovery Methods based on injecting water in the petroleum reservoir in order to support formation pressure and production rates in oil producers and improve oil recovery.
The Expected Ultimate Recovery during the waterflood sweep can be assessed with the following formula:
(1) | EUR_{WF} = E_S \, E_D + (1-E_S) EUR_{ND} |
where E_D – displacement efficiency, E_S – sweep efficiency.
Sweep efficiency
A part of the reservoir pore volume subjected to displacement by invaded fluid (aquifer, injected water, injected gas or injected chemicals):
V_{sweep} – sweep volume
V_\phi – pore volume
A_{sweep} – sweep area
A_\phi – pore area
h_{sweep} – sweep thickness
h_\phi – pore thicknessTotal sweep Areal sweep Vertical sweep
(2)
E_S = \frac{V_{sweep}}{V_\phi}
(3)
E_{SA} = \frac{A_{sweep}}{A_\phi}
(4)
E_{SV} = \frac{h_{sweep}}{h_\phi}
The total sweep efficiency is a product of areal and vertical sweep efficiencies:
(5)
E_S = E_{SV} \, E_{SA}
Water-Oil displacement efficiency
See also
Petroleum Industry / Upstream / Production / Field Development Plan / Recovery Methods
[ Natural Depletion Recovery (NDR) ]
Physics / Fluid Dynamics / Percolation / Reservoir flow / Reservoir flow drive mechanisms
[ Depletion ] [ Recovery Methods ]
[ Aquifer ] [ Aquifer Drive @model ]
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Field Study & Modelling
References
James T. Smith, Wiliam M. Cobb, Waterflooding (2010)