2015-218

Implementing resistivity measurements into compaction and immiscible flow experiments for EOR

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Title:Implementing resistivity measurements into compaction and immiscible flow experiments for EOR
Implementing resistivity measurements into compaction and immiscible flow experiments for EOR
ISBN no.:978-82-490-0865-0

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Reports (Rapporter)
Authors:Nermoen, A.
Giske, N.H.
Skadsem, H.J.
Aursjø, O.
Research group:Flerskala Feltstudier (Multiscale Reservoir Studies)
Distribution restriction:Open
Published by:IRIS,
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Additional information:
;Published by: IRIS;

Abstract:
The main goal in this project has been to quantify the contributing oil ;recovery mechanism from pore volume reduction driven by compaction and from the ;displacement of immiscible fluids. For chalks, some of the surface-active ions ;such as sulfate trigger compaction that lead to enhanced oil recovery and a ;more effective reduction in oil saturation. The saturation is calculated from ;the ratio of the volume occupied by oil divided by the total volume. When ;compaction, triggered by sulfate injection occurs, this affects both the ;numerator and the denominator in the saturation dynamics. As such, a more ;precise estimate of oil/water saturation is required where compaction is ;properly accounted for such that a more precise EOR potential estimate can be ;obtained. As an analogue to chalks we wanted to do tests on a highly porous ;material and in the absence of dissolution/precipitation processes. The best ;analogue we identified was a pack of bi-porous glass beads in which the beads ;are porous themselves. Two experiments were performed with modified core ;holders where electrical resistance and axial strain were measured while ;injecting NaCl brine into the glass bead pack. Test 1 was performed at ;increasing confining pressures and temperatures in which axial strain, ;electrical resistance and hydraulic permeability were estimated. We found the ;resistivity and permeability to be highly sensitive to variations in porosity, ;and that the resistivity of NaCl solution was sensitive to temperature, as ;expected. Test 2 was performed at ambient temperature, while alternating flow ;with Marcol oil and NaCl brine at 20, 100 and 300 bar confining pressure. In ;this experiment the production of the fluid phase that is expelled by the ;injected phase phase was quantified together with the electrical resistance and ;permeability. Since the relation between absolute permeability and “absolute ;resistance” was known from Test 1 , we could compare the observed permeability ;(of the injected phase) and electrical resistance as function of the immiscible ;saturation and porosity. The relative magnitude of compaction and immiscible ;fluid displacement on the oil/water production could be directly quantified ;from these experiments.;;;;;;;;;;;;;

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International Research Institute of Stavanger
Mailing address:
Visiting address:
P.O. Box 8046, N-4068 Stavanger, Norway
Prof. Olav Hanssensvei 15, 4021 Stavanger


Phone:
Fax:

+47 51 87 50 00
+47 51 87 52 00

General email address: firmapost@iris.no