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| Titel |
CO2/ brine substitution experiments at simulated reservoir conditions |
| VerfasserIn |
Juliane Kummerow, Erik Spangenberg |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250113302
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| Publikation (Nr.) |
 EGU/EGU2015-13498.pdf |
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| Zusammenfassung |
| Capillary properties of rocks affect the mobility of fluids in a reservoir. Therefore, the
understanding of the capillary pressure behaviour is essential to assess the long-term
behaviour of CO2 reservoirs. Beyond this, a calibration of the petrophysical properties on
water saturation of reservoir rocks at simulated in situ conditions is crucial for a proper
interpretation of field monitoring data. We present a set-up, which allows for the combined
measurements of capillary pressure, electric resistivity, and elastic wave velocities under
controlled reservoir conditions (pconf = 400 bar, ppore = 180 bar, T = 65 Ë C) at different
brine-CO2 saturations. The capillary properties of the samples are measured using the
micropore membrane technique.
The sample is jacketed with a Viton tube (thickness = 4 mm) and placed between two
current electrode endcaps, which as well contain pore fluid ports and ultrasonic P and S wave
transducers. Between the sample and the lower endcap the hydrophilic semi-permeable
micro-pore membrane (pore size = 100 nm) is integrated. It is embedded into filter papers to
establish a good capillary contact and to protect the highly sensitive membrane against
mechanical damage under load. Two high-precision syringe pumps are used to
displace a quantified volume of brine by CO2 and determine the corresponding sample
saturation. The fluid displacement induces a pressure gradient along the sample, which
corresponds to the capillary pressure at a particular sample saturation. It is measured
with a differential pressure sensor in the range between 0 - 0.2 MPa. Drainage and
imbibition cycles are performed to provide information on the efficiency of capillary
trapping and to get a calibration of the petrophysical parameters of the sample. |
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