The potential-dependent chemical reaction of perchloroethylene (PCE) on copper in neutral noncomplexing aqueous media is explored by means of surface-enhanced Raman spectroscopy (SERS), linear sweep voltammetry and preparative electrolysis at controlled potential.
Fluid/fluid and fluid/rock interfaces have large influence on the microscopic sweep efficiency of an enhanced oil recovery process.
Based on the above analysis, enhanced foam system can simultaneously enlarge sweep volume and increase washing efficiency in the high and low permeability cores.
CO2 foams that are stabilized with nanoparticles are being considered to improve volumetric sweep efficiency for CO2 enhanced oil recovery (EOR) processes.
Polymers are used in enhanced oil recovery (EOR) to increase sweep efficiency, but recent experimental and field data suggest that viscoelastic polymers such as hydrolyzed polyacrylamide (HPAM) reduce residual oil saturation as well.
Recent advances in both spectral-domain optical coherence tomography (SD-OCT), such as improvements in registration and averaging techniques of imaging and enhanced depth imaging [ 3] and swept source optical coherence tomography (SS-OCT), have enabled visualization of the structure of the sub-retinal pigment epithelium (RPE) in AMD.
An attractive enhanced oil recovery method with much better sweep efficiency, which has received less attention, is carbonated water injection.
CO2 water-alternating-gas (WAG) injection is an enhanced oil recovery method designed to improve sweep efficiency during CO2 injection with the injected water to control the mobility of CO2 and to stabilize the gas front.
Unusual redox responses and, in particular, enhanced premonolayer oxidation peaks in the positive sweep, were observed when such wires were subsequently immersed in aqueous media and investigated using cyclic voltammetry.
One of the main issues associated with enhanced oil recovery (EOR) methods is poor volumetric sweep (Kuehne et al. 1990).
The volumetric sweep efficiencies of CO2 flooding for enhanced oil recovery (EOR) are generally low due to problems of viscous fingering and gravity override.
