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Methane Natural Gas Hydrates - PubAg

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Last Updated: 14 October 2021

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Effect of pressure on methane recovery from natural gas hydrates by methane-carbon dioxide replacement

Methane recuperation from gas hydrates by means of CH ₄-CARBON MONOXIDE ₂ substitute is guaranteeing for its benefit in methane recovery and carbon monoxide ₂ capture in the form of carbon monoxide ₂ hydrates. The outcomes show the CH ₄-CARBON MONOXIDE ₂ substitute rate and CH ₄ recuperation performance belong to the total operating pressure and the CH ₄ partial pressure in a CH ₄-CO ₂ double star. On the one hand, the CH ₄-CO ₂ substitute can only take place under such operating pressures that the CH ₄ partial pressure is less than the pure CH ₄ hydrate development balance pressure and the carbon monoxide ₂ partial pressure is greater than the pure carbon monoxide ₂ hydrate development stability pressure.

Source link: https://pubag.nal.usda.gov/catalog/5923566


Methane recovery from natural gas hydrate with simulated IGCC syngas

Methane healing from gas hydrates by CO2-CH4 replacement is thought about as a win-win technology for generating CH4 and sequestrating CO2 synchronously. The changes of concentrations of CH4, CO2 and H2 in gas stage throughout the replacement procedure are managed by Gas Chromatograph, and the gas hydrates are determined via in situ Raman. Significantly, no H2 is discovered in the hydrate phase in the substitute process, which implying that H2 does not compete with CH4 particles inhabiting hydrate cages but plays promo function in CO2-CH4 replacement.

Source link: https://pubag.nal.usda.gov/catalog/5641712


Efficiency enhancements in methane recovery from natural gas hydrates using injection of CO2/N2 gas mixture simulating in-situ combustion

Thermal excitement was combined with an injection of a blend of carbon monoxide ₂ + N ₂ to check out performance enhancements from pure thermal excitement and thermal excitement with carbon monoxide ₂ shot strategies. Examinations were performed at initial hydrate saturation of 10% and 300 ml/min carbon monoxide ₂ + N ₂ shot rate with three different heating rates of 20, 50 and 100 W. The outcomes suggest that thermal excitement with CO ₂ + N ₂ injection is the most effective method readily available for methane gas healing. The outcomes acquired from CO ₂/ N ₂ structure ratio reveal that in the exchange procedure, CARBON MONOXIDE ₂ first changes CH ₄ in the big cages of Structure I hydrates followed by N ₂ targeting CH ₄ in the little cages of Structure I hydrates.

Source link: https://pubag.nal.usda.gov/catalog/6252061


Research progress on methane production from natural gas hydrates

Economically and securely generating methane from gas hydrate deposits is still not on the attracting board. Therefore, it is pressing to establish methane production modern technology and/or approaches to enhance methane manufacturing performance. In this paper, we thoroughly examine the research on methane manufacturing from gas hydrates, consisting of the research on the attributes of gas hydrate tanks, production methods, mathematical simulations and area production examinations.

Source link: https://pubag.nal.usda.gov/catalog/6669176


In Situ Methane Hydrate Morphology Investigation: Natural Gas Hydrate-Bearing Sediment Recovered from the Eastern Nankai Trough Area

The hydrate morphology of natural gas hydrate-bearing sediments recuperated from the eastern Nankai trough location was explored under hydrostatic pressurized conditions that avoid dissociation of gas hydrates in a debris. Presuming homogeneity of hydrate distribution in the planes vertical to the example depth direction, the hydrate morphology of natural GH debris in the eastern Nankai trough location showed a load-bearing morphology type. The combination of PNATs including ATR-IR spectroscopy can be made use of to estimate the properties of GH sediments without the release of pressure to atmospheric problems in order to version gas hydrate reservoirs for gas production.

Source link: https://pubag.nal.usda.gov/catalog/5343471


Raman analysis on methane production from natural gas hydrate by carbon dioxide–methane replacement

Using CO2-- CH4 replacement to produce CH4 from NGH is not just a new CH4 production technology yet a direct way to disposal CO2 by CO2 hydrates. Verdicts are drawn as, on one hand, CH4 molecules are completely replaced with the gas-- strong user interface, but partially changed in deeply inner hydrates by CO2 particles; on the various other hand, the CO2 hydrate and CH4 moisten exist together in a type of structure I and there is no framework makeover during the substitute.

Source link: https://pubag.nal.usda.gov/catalog/6035919


Experimental Verification of Methane–Carbon Dioxide Replacement in Natural Gas Hydrates Using a Differential Scanning Calorimeter

The HP μ-DSC offered reliable measurements of the hydrate dissociation equilibrium and moisturize warm of dissociation for the pure and blended gas hydrates. The hydrate dissociation stability information gotten from the endothermic thermograms of the replaced gas hydrates show that at the very least 60% of CH ₄ is recoverable after reaction with carbon monoxide ₂, which follows the outcome acquired through direct dissociation of the replaced gas hydrates. The heat of dissociation values of the CH ₄ + CARBON MONOXIDE ₂ hydrates were in between that of the pure CH ₄ hydrate which of the pure CO ₂ hydrate, and the values increased as the CO ₂ compositions in the hydrate phase enhanced. This research offers the first experimental proof using a DSC to reveal that the conversion of the CH ₄ hydrate to the CH ₄ + CO ₂ hydrate takes place without considerable hydrate dissociation.

Source link: https://pubag.nal.usda.gov/catalog/5347994


Methane recovery from natural gas hydrate in porous sediment using pressurized liquid CO₂

The characteristics of CH ₄ substitute in natural gas hydrate with fluid CO ₂ was researched with a high pressure three-dimensional activator. Five teams of hydrate examples were formed to explore the impact of hydrate storage tank properties on CH ₄-- CARBON MONOXIDE ₂ substitute response. Compared to injecting aeriform CO ₂ approach, liquid carbon monoxide ₂ injection is benefit for the recovery of CH ₄ from hydrate storage tank with much free water or that without underlying gas space to the level that the injection of fluid CO ₂ is maintained by high gas saturation. The substitute percent of CH ₄ hydrate reduces with the rise of hydrate saturation, but boosts with the rise of water saturation.

Source link: https://pubag.nal.usda.gov/catalog/966411


Study on the spatial differences of methane hydrate dissociation process by depressurization using an L-shape simulator

The spatial distinction of hydrate dissociation by depressurization was examined in an L-shape moisten simulator to improve the exploitation efficiency of natural gas hydrates. Hydrates were located to dissociate slower near the mining well than much from the mining well as a result of the greater water saturation. The mass transfer rate of methane particles in the water stage was much slower than that in the gas phase. In both vertical and horizontal instructions, pore water moved from the location far from the mining well to that near the mining well in the hydrate tank under the pressure difference.

Source link: https://pubag.nal.usda.gov/catalog/7349001


Discrete Element Analysis of Hydraulic Fracturing of Methane Hydrate-Bearing Sediments

The minimum break down pressure of the MHBS boosted as the hydrate saturation enhanced, however the brittleness of the samples with hydrate saturations below 30% was weak, contrasting the malfunction pressure law of fracturing in the conventional breakdown design. According to the favorability of the impact of the distribution model of hydrate in the sediment on fracturing, the hydrate sealing grain contact version can be ranked above the hydrate load-bearing granular framework model. The minimum break down stress of the hydrate cementing grain contact model examples were above those of the hydrate load-bearing granular structure design examples. Throughout straight natural fracturing of the MHBS samples, the natural fracture should get to a particular length to create a new tensile hydraulic crack that extended the natural fracture.

Source link: https://pubag.nal.usda.gov/catalog/7341760

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions