GEOTHERMAL TECHNOLOGIES LEGACY COLLECTION - Bibliographic Citation


Bibliographic Citation


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Title: Laboratory testing and modeling to evaluate perfluorocarbon compounds as tracers in geothermal systems
Creator/Author: Reimus, Paul W [Los Alamos National Laboratory]
Publication Date:2011 Jan 21
OSTI Identifier:OSTI 1048814
Report Number(s):LA-UR-11-00475; LA-UR-11-475
DOE Contract Number:AC52-06NA25396
Document Type:Conference
Specific Type:
Coverage:
Resource Relation:Conference: Thiety-Sixth Workshop on Geothermal Reservoir Engineering ; January 31, 2011 ; Stanford University, Palo Alto, CA
Other Number(s):
Research Org:Los Alamos National Laboratory (LANL)
Sponsoring Org:DOE
Subject:02 PETROLEUM; 15 GEOTHERMAL ENERGY; 58 GEOSCIENCES; ADSORPTION; BRINES; DRILLING; FRACTURES; GEOTHERMAL SYSTEMS; HYDROCARBONS; MIXTURES; RESERVOIR ENGINEERING; SIMULATION; STABILITY; STIMULATION; SURFACE AREA; TESTING; WATER
Keywords:
Description/Abstract:The thermal stability and adsorption characteristics of three perfluorinated hydrocarbon compounds were evaluated under geothermal conditions to determine the potential to use these compounds as conservative or thermally-degrading tracers in Engineered (or Enhanced) Geothermal Systems (EGS). The three compounds tested were perfluorodimethyl-cyclobutane (PDCB), perfluoromethylcyclohexane (PMCH), and perfluorotrimethylcyclohexane (PTCH), which are collectively referred to as perfluorinated tracers, or PFTs. Two sets of duplicate tests were conducted in batch mode in gold-bag reactors, with one pair of reactors charged with a synthetic geothermal brine containing the PFTs and a second pair was charged with the brine-PFT mixture plus a mineral assemblage chosen to be representative of activated fractures in an EGS reservoir. A fifth reactor was charged with deionized water containing the three PFTs. The experiments were conducted at {approx}100 bar, with temperatures ranging from 230 C to 300 C. Semi-analytical and numerical modeling was also conducted to show how the PFTs could be used in conjunction with other tracers to interrogate surface area to volume ratios and temperature profiles in EGS reservoirs. Both single-well and cross-hole tracer tests are simulated to illustrate how different suites of tracers could be used to accomplish these objectives. The single-well tests are especially attractive for EGS applications because they allow the effectiveness of a stimulation to be evaluated without drilling a second well.
Publisher:
Country of Publication:US
Language:English
Size/Format:Medium: ED
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System Entry Date:2012 Dec 05
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