A perfluorocarbon tracer transport and dispersion experiment in the North Sea Ekofisk oil field
A perfluorocarbon tracer (PFT) transport and dispersion experiment has been performed in the Ekofisk section of the North Sea oil fields. Fifty grams each of three PFTs were injected into a well and 28 surrounding wells were sampled for the presence of PFT. Sampling was accomplished by initially collecting bottles of reservoir hydrocarbon gas and subsequently transferring 5 liter (gas phase) aliquots onto Capillary Adsorbent Tracer (CAT) samplers. The resulting CATS samplers were analyzed for PFT in a specially configured laboratory gas chromatograph with electron capture detection. The limit of detection for PFT as determined by standard addition experiments was circa 1 to 10 femtoliters (10{sup {minus}15} L) per liter of sampled reservoir gas. Sampling was performed up to two years past the injection time; approximately two hundred samples were analyzed. PFT was performed only in four sampling wells at four different times, though the PFT analysis of earlier samples lack sufficient sensitivity to PFT detection due to a hydrocarbon interferent problem which was resolved during this experiment. The PFT concentrations observed in these four wells appeared to follow an exponential dilution law with a dilution half-life of approximately 70 days in the reservoir. Recommendations for future experiments of this nature are made based on the problems encountered in this initial study. 4 refs., 28 figs., 10 tabs.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 7270738
- Report Number(s):
- BNL-43811; ON: DE90007353
- Country of Publication:
- United States
- Language:
- English
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NATURAL GAS
QUANTITATIVE CHEMICAL ANALYSIS
OIL FIELDS
SITE CHARACTERIZATION
TRACER TECHNIQUES
COMPARATIVE EVALUATIONS
DILUTION
GAS INJECTION
NORTH SEA
SAMPLING
SUBSURFACE ENVIRONMENTS
ATLANTIC OCEAN
CHEMICAL ANALYSIS
ENERGY SOURCES
FLUID INJECTION
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
GEOLOGIC DEPOSITS
ISOTOPE APPLICATIONS
MINERAL RESOURCES
PETROLEUM DEPOSITS
RESOURCES
SEAS
SURFACE WATERS
020200* - Petroleum- Reserves
Geology
& Exploration