Aquifer thermal energy storage reference manual: seasonal thermal energy storage program Page: 65 of 99
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Activities for FY-1982 through FY-1985 are as follows:
. Complete generic investigation of porous media aquifer stability
. Evaluate aquifer stability for FTF and demonstration project sites
" Define mechanism(s) for STES induced changes in permeability, compressi-
bility, and water quality
. Identify applicable procedures for aquifer preconditioning, maintenance
and rehabilitation to prevent permeability degradation or adverse water
Studies carried out under the Laboratory Analysis Task will provide for
characterization of the mechanisms that could potentially cause injection/
recovery impairment and water quality alterations under ATES operating condi-
tions. Understanding of the mechanisms will allow development and application
of preventive and/or remedial procedures.
Technical Progress and Preliminary Results of the Laboratory Analysis Task
Subtask 1 - Physical and Chemical Stability of Aquifer Materials
Efforts to date have centered on reviewing the available literature, new
theoretical developments, experimental strategy, and identification and fab-
rication of test facilities. A topical report has been drafted covering the
apparent degradation of permeability with moderate increases in fluid tem-
perature. Researchers have observed a decrease of more than 50% in sandstone
permeability to liquid water when the temperature is increased from 250C to
less than 1750C (Figure 3.6.1). Similar changes are not observed when dry
nitrogen, mineral oil, or dry alcohol is used as the working fluid. Unfor-
tunately, sample deformation and fluid viscosity changes at temperature have
not been monitored in previous studies. Equipment is currently being con-
structed to permit simultaneous measurement of fluid temperatures, pressures,
viscosities, and chemistry as well as the stress and deformation of the porous
DATE ISSUED: SUPERSEDES PNL-3471 SECTION 3.6
August 1980 ISSUE DATED: New PAGE 3
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Prater, L.S. Aquifer thermal energy storage reference manual: seasonal thermal energy storage program, report, January 1, 1980; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc1053829/m1/65/: accessed May 27, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.