Methane Hydrates: Major Energy Source for the Future or Wishful Thinking?

Thomas, C.P.

doi:10.2523/71452-ms

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…In a recent paper discussing the estimates of worldwide gas hydrate resources, it was argued that there was still no clear cut convergence of estimates over the last twenty years and that the number of estimates is so small that serious doubt can be raised about the inferences drawn from the estimates (Lerche, 2001;Thomas, 2001). Despite the enormous range in reported gas hydrate volumetric estimates, even the lowest estimates seem to indicate that gas hydrates are a greater resource of natural gas than conventional accumulations.…”

Section: Introductionmentioning

confidence: 99%

The Dissociation Rate Measurement for Natural Gas Recovery From Gas Hydrates

Dou¹,

Jiang

Xiang

et al. 2007

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractHydrate self-preservation property has been reported by some researchers in recent years. So as to test the dissociation rate of hydrates in different temperatures and pressure conditions. The authors conducted laboratory experiments of methane hydrate dissociation in order to examine its potential for application to product natural gas from hydrate. The gas methane's used in this work were artificially prepared using the methane hydrate. Methane hydrate dissociation was measured at atmosphere pressure within temperature range between -7ºC and 5ºC, and relatively slow dissociation was confirmed at around -5ºC. The dissociation rates of the gas hydrates observed can be used to evaluate the gas quantitatively of the hydrate fields, and to safely and eeconomically produce natural gas from hydrates deposits.

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Section: Introductionmentioning

confidence: 99%

The Dissociation Rate Measurement for Natural Gas Recovery From Gas Hydrates

Dou¹,

Jiang

Xiang

et al. 2007

All Days

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“…Methane hydrates occur in abundance in permafrost areas and in offshore continental margin environments throughout the world (Collett et al, 2009). The estimated methane hydrate accumulation worldwide is 700,000 Tcf or about twice the total carbon in coal, oil, and conventional gas in the world (Thomas, 2001). In Japan, there is a large amount of methane hydrate accumulated in the Nankai Trough ) that is of great strategic importance to Japan.…”

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Well Integrity Evaluation for Methane Hydrate Production in the Deepwater Nankai Trough

et al. 2014

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Large accumulations of methane hydrates are known to exist in the deepwater Nankai Trough located off the southern coast of Japan. Due to its enormous potential as an energy source, there is growing interest in the production of methane gas from these deposits. An offshore production test was scheduled to test the technological viability to produce the methane hydrate by using a depressurization method. However, methane hydrate production may cause large amounts of compaction and subsidence, which can damage well integrity and cause loss of zonal isolation in the overburden. This condition could provide potential leakage pathways for methane gas to the surface and endanger offshore operations.The paper presents a study in which well integrity was evaluated for a methane hydrate production test well in the Nankai Trough. In this study, a new workflow was proposed and applied to honor both fieldwide formation heterogeneity and near-wellbore geometry. The geomechanics properties were determined through integration of seismic inversion data, log data, and core data from the Nankai Trough. Interface elements were installed between the casing and cement and the cement and formation to evaluate the impact of cement bond quality on the well integrity. The numerical simulation was conducted through coupling of the simulation results produced by a methane hydrate production simulator from a third party with a 3D finite-element (FE) geomechanics simulator.The study predicted the occurrence of 2-cm of subsidence on the seafloor generated by approximately 1.5% of reservoir compaction for a production test of 20 days. Over this period, casing would yield with a plastic strain of about 1%. Most findings indicated a low risk in the loss of zonal isolation which is consistent with the results of the production test conducted in March 2013.This simulation evaluated potential risks related to well integrity, and provided critical information for the preparation and execution of the pioneering offshore methane hydrate production test in the Nankai Trough.

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Methane Hydrates: Major Energy Source for the Future or Wishful Thinking?

Cited by 2 publications

References 6 publications

The Dissociation Rate Measurement for Natural Gas Recovery From Gas Hydrates

The Dissociation Rate Measurement for Natural Gas Recovery From Gas Hydrates

Well Integrity Evaluation for Methane Hydrate Production in the Deepwater Nankai Trough

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