Nanoparticle perspective SARS virus human Tcell lymphotropic virus Nano Scale Chemical Delivery System for Oil amp Gas Applications Evolved from drug delivery technologies developed in pharmaceutical industry ID: 930025
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Slide1
Nano
Technologies forImproved Oil & Gas Recovery
Slide2Nanoparticle perspective….
SARS virus
human T-cell
lymphotropic
virus
Slide3Nano Scale Chemical Delivery System
for Oil & Gas Applications*
Evolved from drug delivery technologies developed in pharmaceutical industry.
Using
nanoparticles
(polyelectrolyte complexes) to entrap oil & gas field chemicals.
Able to penetrate deep into formation rock (particle size in nanometer range).
Change of
nanoparticle surface charge by altering mixing sequence.Controlled release of chemicals achieved by engineering compositions of
nanoparticles
.
* KU Patent Pending
Slide4Potential Applications for
Oil & Gas Industry
Any active agent capable of generating a binding event with
nanoparticles
.
Examples:
Metal
ions (single and
multivalent)
Gel
Breakers (Enzymes,
Oxidizers)
Scale inhibitors
Corrosion inhibitors
SurfactantsEtc.
Slide5What are we looking for in
nano-carriers and other nano systems?
Environmentally
friendly
-
non-toxic
-
biodegradable
Cost effective
Compatible with hostile underground
environments
- pH-
temperature
&
pressure- salinityCompatible with reservoir rock and fluidsAble to control propagation in reservoir rockAble to entrap and protect “active” during placement
Able to control/delay the release of “active”
Able to scale up to field scale
Slide6Example Application in Improved Oil & Gas Recovery
Polymer gels have been used extensively to improve sweep efficiency by blocking high conductivity channels during enhanced oil recovery operations.
Cr(III)
crosslinks
with Partially Hydrolyzed
Polyacrylamide
polymer (HPAM) to form a strong gel.
Once gelled, can no longer propagate in formation rock.Gelation
time too short (< 30 min.) to place gel deep into formation rock.Polyelectrolyte complex nanoparticles
can entrap and control the release of Cr(III) to delay the onset of
gelation
.
Slide7Polyanion
Polycation
Cr(III)
MIX
Nanoparticles
+
Cr(III)
Process of Entrapping Active Agents
in
Nanoparticles
Slide8Characterization of Nanoparticles
Sample
Diameter
nm
Zeta Potential
mV
Entrapment Efficiency %
Cr(III)
-
Nanoparticles
140.6±3.6
16.12±1.24
95.9
Laser Particle Size & Zeta Potential Analyzer
Slide9Controlled Release of Crosslinking Agent
(Delay Gelation of Cr(III)-HPAM Gel)
Gelant
Composition
5,000
ppm
HPAM (Mw = 6,000
kDa
) +
Nanoparticles
loaded with 100
ppm
Cr(III)
+
1%(w/w) NaCl +100
ppm
NaN
3, pH=9.45
HPAM
Gelant
HPAM 5,000 ppm
Cr(III) 100 ppm
Nanoparticles
+
Cr(III)
Slide10Delayed Gelation of HPAM Gel Using Entrapped Cr(III)
Gelation
time at 40
C was up to 10 days
In contrast Control
gelants
consisting of 5,000
ppm
HPAM and 100
ppm
Cr (as CrCl
3
·6H
2
O) formed gels
in less than 5 min
Top of scale
Slide11Other Example Application for Oil & Gas Industry
Fracturing fluid cleanup
Entrap breaker with
nanoparticles
and pump with fracturing fluid
Electrostatic repulsion between like-charged
nanoparticles
insure suspension and even distribution in fracturing fluid.
Evenly distributed breaker insures effective breakdown of fracturing fluid when released
Breaker release can be controlled until desired elapsed time (
e,g
., 1 day)