Dissociation behavior of hydrate core sample using thermodynamic inhibitor-part 3. Inhibitor or steam injection combined with depressurization and high-concentration inhibitor injection

T. Kawamura, M. Ohtake, Y. Yamamoto, H. Haneda, Y. Sakamoto, T. Komai

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Natural gas hydrates exist in geological formations and constitute a potentially large natural gas resource for the future. To recover natural gas from hydrates, these must be dissociated in situ. At the present stage, the depressurization method is expected to be a main dissociation procedure. In this study, the inhibitor injection method or steam injection method combined with depressurization, and inhibitor injection with a higher methanol concentration, have been examined using laboratory-made methane hydrate-bearing sediment. Comparison with other methods made it clear that the combined method contributed the fastest gas production rate. The advantages of the combined method become remarkable at a higher pressure condition (smaller depressurization from initial pressure). The production rate of the combined method becomes faster as the pressure is lower. In the case of a high concentration injection, it becomes clear that the higher inhibitor concentration effectively contributes to the faster gas production rate, and a significant dilution of methanol by pure water from hydrate dissociation was observed, compared to the lower concentration case.

Original languageEnglish
Pages (from-to)125-131
Number of pages7
JournalInternational Journal of Offshore and Polar Engineering
Volume20
Issue number2
Publication statusPublished - 2010 Jun 1
Externally publishedYes

Keywords

  • Core sample
  • Dissociation
  • Exploitation
  • High concentration
  • Hydrate
  • Inhibitor
  • Natural gas
  • Steam

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Ocean Engineering
  • Mechanical Engineering

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