Simulation of In-situ Combustion in Gas Hydrate Systems for Methane Production & Carbon Sequestration
Başlık:
Simulation of In-situ Combustion in Gas Hydrate Systems for Methane Production & Carbon Sequestration
Yazar:
Tupsakhare, Swanand, author.
ISBN:
9780438002746
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (192 pages)
Genel Not:
Source: Dissertation Abstracts International, Volume: 79-10(E), Section: B.
Advisors: Marco J. Castaldi Committee members: Charles Maldarelli; Jeff Morris; Vincent Pauchard; Nick Tiliakos.
Özet:
Experiments were conducted using thermal stimulation and thermal stimulation combined with (CO2+N2) gas exchange to study the process of methane production from gas hydrates. A testing matrix was designed to investigate the effect of initial hydrate saturation, dissociation heating rates, and (CO2+N2) gas injection rates on methane gas recovery, thermal efficiency, and carbon sequestration. The results from thermal stimulation tests indicate that reducing the heating rate decreases the gas recovery efficiency while increasing the peak thermal efficiency value. At 50% initial hydrate saturation (SH), reducing the heating rate from 100 W to 20 W, reduced the recovery efficiency from 72% to 39% while increasing the peak thermal efficiency from 86% to 96%. The time required to recover a certain number of moles of methane increased by reducing the heating rate. The results from thermal stimulation tests also indicate that an accurate knowledge of hydrate saturation in the reservoir can lead to higher thermal efficiencies. Injection of a mixture of CO2+N2 during the hydrate dissociation increased the recovery efficiency of the process over thermal stimulation and thermal stimulation with pure CO2 injection. At 10% SH and 100 W heating rate, the recovery efficiency increased by a value of 47% and 17% over thermal stimulation and thermal stimulation with pure CO2 exchange respectively. The temperature profile in the reactor was studied in detail to understand the results. At lower heating rates the CO2 sequestration is more efficient as it maintains the sediment temperature within hydrate stability zone. At 10% SH, the CO 2 exchange factor increased from 0.32 to 0.86 when the heating rate was reduced from 100 W to 20 W. The results of the CO2+N2 gas exchange process are in agreement with the trend predicted in the literature by NMR in situ spectroscopy based on molecular diameter to cavity diameter ratio for CO2 and N2 in Structure I hydrates. The gas composition ratio of CO2/N2 confirms the MD simulation results predicted in the literature. The results indicate that the exchange process begins by CO2 replacing CH4 in the large cages followed by N2 replacing CH4 in the small cages.
Notlar:
School code: 1606
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
---|---|---|---|
XX(678091.1) | 678091-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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