2014-477

The Dynamic Stability of Chalks During Flooding

Author: 

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Title:The Dynamic Stability of Chalks During Flooding;of Non-equilibrium Brines and CO2

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Conferences (Konferanser)
Authors:Nermoen, A.
Korsnes, R.I.
Haug, S.A.
Hiorth, A.
Madland, M.V..
Research group:Flerskala Feltstudier (Multiscale Reservoir Studies)
Distribution restriction:Open
Published by:EAGE, eage.org
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Additional information:
Fourth EAGE CO2 Geological Storage Workshop, 22-24 April 2014, Stavanger, Norway;Published by: EAGE, eage.org;

Abstract:
We have shown how the dynamic evolution of the creep curve depends upon pore ;fluid composition and;CO2 content. The presented experiment were performed on Kansas outcrop chalk ;which serves as model;to understand chemical and physical procesess in chalk reservoirs. The test was ;performed at in-situ stress,;pressure and temperature conditions. The stresses imposed to the chalk was in ;the plastic regime such that;the plug deformed under pore collapse. The creep curve, i.e. deformation at ;constant stresses, is;recognized by a monotonous increasing function with varying rate, dependent ;upon pore fluid;composition. A statistical model is fitted to the different creep periods. ;Special emphasis is made on how;the changes from the inert NaCl-brine to sea water brine (SSW) after 46 days; ;and from SSW to SSW ;CO2 at 116 days and 130 days altere the creep curve dynamics. Injection of SSW ;induces a period of;accelerating creep whilst the addition of CO2 seems to reduce the observed ;creep rate. More data is;required to support these observations.;;;;;;;;;;;;;

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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