Numerical simulation of a laboratory-scale experiment for the hydrate dissociation process in porous media by acid injection

Yasuhide Sakamoto, Yusuke Nakano, Fuyuki Kaneko, Kengo Nakamura, Takeshi Komai

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, to enhance gas recovery from a methane hydrate reservoir, experimental and numerical studies that con-sidered the acid injection process as a secondary gas recovery process after the depressurization operation were conducted. First, we experimentally analyzed the dissociation behavior of propane hydrate (PGH) in porous media by using acid injection and confirmed that the dissociation condition of PGH was shifted to the sides of low temperature and high pressure. This enabled the dissociation to proceed easily as the concentration of the injected acid increased. Then, on the basis of experimental observation, we conducted history matching for the temperature change and gas production behavior during PGH dissociation by acid injection, by varying the initial hydrate saturation, the reaction rate constant for acid consump-tion, and the intrinsic dissociation rate constant as the calculation parameters. Through history matching, we confirmed the validity of the developed numerical model targeting the dissociation of hydrates in porous media by acid injection.

Original languageEnglish
Pages (from-to)501-512
Number of pages12
JournalInternational Journal of Offshore and Polar Engineering
Volume30
Issue number4
DOIs
Publication statusPublished - 2020 Dec

Keywords

  • Acid injection
  • Dissociation
  • History matching
  • Methane hydrate
  • Numerical simulation
  • Porous media
  • Propane hydrate

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Ocean Engineering
  • Mechanical Engineering

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