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Numerical Modelling and Simulation Optimization of Geothermal Reservoirs Using the Tough2 Family of CodesVasini, Ester Maria <1986> January 1900 (has links)
In order to improve the reservoir engineering activities and, in particular, to optimize numerical modelling and simulation of geothermal reservoirs using the TOUGH family of codes, it has been decided to use the software T2Well for the interpretation of well-tests, coupling T2Well with the equation of state module EWASG, which describes the typical thermodynamic condition in high enthalpy geothermal reservoirs. T2Well-EWASG has been coupled and tested through the typical process of verification and validation. The application of T2Well-EWASG for the interpretation of well-tests related to the slim hole WW-01 drilled in the Wotten Waven Field (Commonwealth of Dominica) proves that it can be used as a tool for integrated interpretation of surface and downhole measurements collected during the performance of production tests in geothermal wells. The strength of this tool is that it allows to reduce the different possible solutions (in terms of reservoir characterization) within an acceptable error, by allowing the interpretation of surface and downhole measurements in conjunction, instead of separately. From this point of view T2Well-EWASG can effectively be used as a tool which allows an improvement of reservoir engineering activities. Finally, the huge amount of data managed during these activities has permitted to test and project the improvement of pre- and post- processing tools specific for TOUGH2 created by the geothermal research group of DICAM. In particular, the pre- and post-processing tools have been validated with a case study dealing with the migration of non-condensable gases in deep sedimentary formation.
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Studio del moto dei fluidi in mezzi porosi in regime non-darcyTabaroni, Gian Carlo <1976> 17 May 2007 (has links)
No description available.
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Evaluation of alkali flooding combined with intermittent flow in carbonate reservoirSrisuriyachai, Falan <1980> 16 April 2008 (has links)
The majority of carbonate reservoir is oil-wet, which is an unfavorable
condition for oil production. Generally, the total oil recovery after both primary and
secondary recovery in an oil-wet reservoir is low. The amount of producible oil by
enhanced oil recovery techniques is still large. Alkali substances are proven to be able
to reverse rock wettability from oil-wet to water-wet, which is a favorable condition
for oil production. However, the wettability reversal mechanism would require a noneconomical
aging period to reach the maximum reversal condition. An intermittent
flow with the optimum pausing period is then combined with alkali flooding
(combination technique) to increase the wettability reversal mechanism and as a
consequence, oil recovery is improved.
The aims of this study are to evaluate the efficiency of the combination
technique and to study the parameters that affect this method. In order to implement
alkali flooding, reservoir rock and fluid properties were gathered, e.g. interfacial
tension of fluids, rock wettability, etc. The flooding efficiency curves are obtained
from core flooding and used as a major criterion for evaluation the performance of
technique.
The combination technique improves oil recovery when the alkali
concentration is lower than 1% wt. (where the wettability reversal mechanism is
dominant). The soap plug (that appears when high alkali concentration is used) is
absent in this combination as seen from no drop of production rate. Moreover, the use
of low alkali concentration limits alkali loss. This combination probably improves oil
recovery also in the fractured carbonate reservoirs in which oil is uneconomically
produced.
The results from the current study indicate that the combination technique is
an option that can improve the production of carbonate reservoirs. And a less quantity
of alkali is consumed in the process.
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Valutazione delle performance degli scalpelli da perforazione: studi teorici, analisi dati e valutazioni tecnico-economicheMagagni, Matteo <1975> 16 April 2008 (has links)
The study is aimed to calculate an innovative numerical index for bit performance evaluation called
Bit Index (BI), applied on a new type of bit database named Formation Drillability Catalogue
(FDC). A dedicated research programme (developed by Eni E&P and the University of Bologna)
studied a drilling model for bit performance evaluation named BI, derived from data recorded while
drilling (bit records, master log, wireline log, etc.) and dull bit evaluation. This index is calculated
with data collected inside the FDC, a novel classification of Italian formations aimed to the
geotechnical and geomechanical characterization and subdivisions of the formations, called
Minimum Interval (MI). FDC was conceived and prepared at Eni E&P Div., and contains a large
number of significant drilling parameters. Five wells have been identified inside the FDC and have
been tested for bit performance evaluation. The values of BI are calculated for each bit run and are
compared with the values of the cost per metre. The case study analyzes bits of the same type,
diameters and run in the same formation. The BI methodology implemented on MI classification of
FDC can improve consistently the bit performances evaluation, and it helps to identify the best
performer bits. Moreover, FDC turned out to be functional to BI, since it discloses and organizes
formation details that are not easily detectable or usable from bit records or master logs, allowing
for targeted bit performance evaluations. At this stage of development, the BI methodology proved
to be economic and reliable. The quality of bit performance analysis obtained with BI seems also
more effective than the traditional “quick look” analysis, performed on bit records, or on the pure
cost per metre evaluation.
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Valorisation of organic waste: new developments from proton nuclear magnetic resonance characterizationVannini, Marianna <1986> 21 May 2015 (has links)
The last half-century has seen a continuing population and consumption growth, increasing the competition for land, water and energy. The solution can be found in the new sustainability theories, such as the industrial symbiosis and the zero waste objective. Reducing, reusing and recycling are challenges that the whole world have to consider. This is especially important for organic waste, whose reusing gives interesting results in terms of energy release. Before reusing, organic waste needs a deeper characterization. The non-destructive and non-invasive features of both Nuclear Magnetic Resonance (NMR) relaxometry and imaging (MRI) make them optimal candidates to reach such characterization. In this research, NMR techniques demonstrated to be innovative technologies, but an important work on the hardware and software of the NMR LAGIRN laboratory was initially done, creating new experimental procedures to analyse organic waste samples. The first results came from soil-organic matter interactions. Remediated soils properties were described in function of the organic carbon content, proving the importance of limiting the addition of further organic matter to not inhibit soil processes as nutrients transport. Moreover NMR relaxation times and the signal amplitude of a compost sample, over time, showed that the organic matter degradation of compost is a complex process that involves a number of degradation kinetics, as a function of the mix of waste. Local degradation processes were studied with enhanced quantitative relaxation technique that combines NMR and MRI. The development of this research has finally led to the study of waste before it becomes waste. Since a lot of food is lost when it is still edible, new NMR experiments studied the efficiency of conservation and valorisation processes: apple dehydration, meat preservation and bio-oils production. All these results proved the readiness of NMR for quality controls on a huge kind of organic residues and waste.
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