Viscoelastic fluids demonstrating such behavior have been shown to improve displacement efficiency
and recovery yields compared with conventional Newtonian fluids.
Zhang, "A new calculation of water displacement efficiency for layered reservoir," Special Oil and Gas Reservoirs, vol.
Zhou, "A new method for calculating non-piston displacement efficiency in multilayered reservoir with waterflooding," Petroleum Geology & Recovery Efficiency, vol.
The main purpose of adding polymer to the injected water is to decrease the mobility of the flood water by increasing its viscosity to improve the oil displacement efficiency
With this lower displacement efficiency
, the carbon gap is more significant, and it takes 23 years for the sustainable rate of carbon displacement to surpass the short-lived decay of forest residuals.
These methods improve the sweep efficiency and the displacement efficiency
This mechanism may considerably improve water displacement efficiency
, and ultimately lead to higher oil recovery
In addition, it is indicated that polymer solution can improve microscopic displacement efficiency
because of excellent viscoelasticity [XIA,2001; HUANG, 1990;].
It implies that horizontal injection well can expand the sweep area, change the fluid flow mode, delay the increase of water cut, and ultimately improve the oil displacement efficiency
High biomass growth rates from short rotation woody crops offset much of the relatively low carbon displacement efficiency
from producing ethanol.
At this time, using polymer flooding can improve both Volumetric Sweep Efficiency and Oil Displacement Efficiency
Apparently, an early breakthrough of bottom-water leads to a very poor water displacement efficiency