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Copy of Nano EOR
Transcript of Copy of Nano EOR
behind this frame! Double click to crop it if necessary San Francisco Budapest Important
Details (cc) photo by Metro Centric on Flickr (cc) photo by Franco Folini on Flickr (cc) photo by jimmyharris on Flickr Stockholm (cc) photo by Metro Centric on Flickr What is EOR? Why EOR? Typical EOR Processes Nanoparticles physical chemistry impacts Nanoscale Phenomena CO2 Foams Stability and Control Nanoparticles Concentration Salinity Assets map details doodles notes outlook photo frame Navid Bizmark
Kun Cheng EOR refers to an oil recovery technique by adding chemical/solvent/heat into the reservoir. Chemical EOR
flooding Solvent EOR
injection Thermal EOR
E.g. Hot water injection The primary/secondary recovery methods are able to recover only ~30% O.O.I.P EOR targets at those residual oil left in the reservoir and improve the overall recovery efficiency.
EOR CO2 injection
When miscibility increases, the capillary pressure that holds oil immobile is reduced. CO2 can be easily separated at the end of
production well and hence can be recycled for injection Under certain conditions, when mixed with the injected CO2, residual oil has a higher miscibility with the drilling fluid Surfactant Flooding A surface-active chemical agent absorbed at the interface when present at low concentration. Reducing Interfacial Tension Consist of a lyophilic tail and a hydrophilic head(structure of micelle) Foam Flooding Improves mobility ratio and displacement efficiency. Foam is formed when a gas is in contact with a foaming agent (e.g. surfactant) that provides sufficient mechanical energy. + - Foam Unstability
Block undesirable fluid from early breakthrough + - Low viscosity at the injection condition, 0.06-0.1 cP
High mobility ratio early breakthrough of CO2
M: Mobility ratio
Kd: permeability of displacing fluid
Ko: permeability of oil
μd: viscosity of displacing fluid
μo: viscosity of oil + - loss of surfactant due to rock-fluid interaction
Three schemes: precipitation; adsorption to the porous medium; and phase partitioning to a slow-moving fluid Categories Interparticle Forces Coulombic Force van der Waals Force ion-ion interaction z: ion valance
e: electron charge
r: separation distance Self-Assembly A spontaneouse phenomenon Stable Thermodynamic State Amphiphilic Molecule Amphiphilic nanoparticle Janus particle Stability Effective in high salinity condition Wettability hydrophilic surface:
glass hydrophobic surface:
PTFE TiO2 and sulfur nanoparticles Results:
Both nanoparticles enhances the water wettability of PTFE surface.
Wetting properties enhance by increasing the nanoparticles concentration.
Only sulfur nanoparticles enhance the wetting properties of glass surface.
Interfacial Tension Adsorption Fluid viscosity and mobility control Shear Rate Conditions:
Fluid: DI Water Crude oil viscosity reduction Toluene-in-water mixture
10 wt.% 5nm silica particles Emulsion stabilization Oil-in-water:
5 wt.% nanoparticles load
Stable emulsions up to 2 months Foam Stability Attractive For Enhancing EOR Techniques On mixture viscosity SUMMARY
Short review on the most common EOR techniques
The attraction of nanoparticles
Physical chemistry effects
Reviewing a case study