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Heat Exchanger Fouling and Cleaning VII
July 1-6, 2007 - Tomar, Portugal
| Editors: |
Hans Müller-Steinhagen, Institute of Technical Thermodynamics, German Aerospace Centre (DLR)
and Institute for Thermodynamics and Thermal Engineering, University of Stuttgart, Germany
M. Reza Malayeri, University of Stuttgart, Germany
A. Paul Watkinson, The University of British Columbia, Canada |
The articles for these proceedings are peer-reviewed.
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SCALE DEPOSITS IN POROUS MEDIA AND THEIR REMOVAL BY EDTA INJECTION
J. Moghadasi, Petroleum Engineering Department, Petroleum University, Ahwaz, IRAN
H. Müller-Steinhagen, Institute for Thermodynamics and Thermal Engineering, University of Stuttgart, Institute of Technical Thermodynamics, German Aerospace Centre (DLR), D-70550, Stuttgart, GERMANY
M. Jamialahmadi, Petroleum Engineering Department, Petroleum University, Ahwaz, IRAN
A. Sharif, Chemical and Process Engineering Department, University of Surrey, Guildford, GU2 7XH, UK
ABSTRACT:
Formation damage has been observed in several oil
reservoirs and production equipment in Iranian oil
fields. Laboratory and field testing confirmed that the
primary cause of damage was the build-up of calcium
carbonate, calcium sulfate and strontium sulfate scale
either in the perforation tunnels or in the formation
sandstone nears the wellbore. Conventional acid
treatments could dissolve this scale, but scale
precipitation from the spent acid caused rapid
productivity decline. A scale removal treatment with
Na2H2EDTA has been developed that can effectively
dissolve scale and chelate the dissolved metal ions.
Chelation of the dissolved scale prevents scale reprecipitation.
This study describes the results of an
experimental and theoretical study on the removal of
formation damage resulting from scale formation in
porous media. An experimental investigation was
undertaken to look into the possible causes of the
injectivity loss in a typical Iranian oilfield. Sets of
experimental investigations were undertaken with
different objectives in mind. Glass and sand bead packs
were used to test the experimental set up and to observe
the general behaviour of scale formation and removal
by ethylene diamine tetra acetic acid (EDTA) to
determine its possible effects on the permeability of the
porous medium.
J. Moghadasi, H. Müller-Steinhagen, M. Jamialahmadi, and A. Sharif, "SCALE DEPOSITS IN POROUS MEDIA AND THEIR REMOVAL BY EDTA INJECTION" in "Heat Exchanger Fouling and Cleaning VII", Hans Müller-Steinhagen, Institute of Technical Thermodynamics, German Aerospace Centre (DLR)
and Institute for Thermodynamics and Thermal Engineering, University of Stuttgart, Germany
M. Reza Malayeri, University of Stuttgart, Germany
A. Paul Watkinson, The University of British Columbia, Canada
Eds, ECI
Symposium Series, Volume RP5 (2007). http://services.bepress.com/eci/heatexchanger2007/10
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