Improvement of near wellbore permeability by methanol stimulation in a methane hydrate production well

Yoshihiro Masuda, Yoshihiro Konno, Hiroki Iwama, Taro Kawamura, Masanori Kurihara, Hisanao Ouchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Current research on methane hydrate as an energy resource makes a remarkable advance under the national research projects in Japan, Canada, and US and several field production tests were carried out for demonstrating methane hydrate gas production. The methanol huff-and-puff stimulation was proposed as a possible way for improving gas productivity of such a methane hydrate well. Numerical studies are presented to demonstrate that the huff-and-puff stimulation before depressurization works well in improving gas productivity. The methanol huff-and-puff stimulation consists of the two-process cycles, i.e., injection of a methanol-solution slug into the well, and flowback with depressurization. Based on calculation using our numerical simulator, MH2I-HYDRES (MH2I Hydrate Reservoir Simulator), hydrate dissociation behavior during the huff-and-puff stimulation and successive gas production performance was evaluated for a hypothetical methane hydrate well. Huff-and-puff stimulation dissociated hydrates near the wellbore for the formation to produce gas at much higher rates than the ones without stimulation. Formation temperature went down below zero along the hydrate equilibrium curve during the huff-and-puff cycles and the decreased temperature helped the surrounding formation to supply heat for promoting hydrate dissociation. In some cases, hydrate regenerated in the region where hydrate-dissociated water dilutes methanol, but its influence was little. Huff-and-puff schedule like huff/puff time ratio and methanol-slug concentration affected the stimulation results. This is an abstract of a paper presented at the Offshore Technology Conference - Waves of Change (Houston, TX 5/5-8/2008).

Original languageEnglish
Title of host publicationOffshore Technology Conference, OTC 08 - "Waves of Change"
Pages1617-1628
Number of pages12
Publication statusPublished - 2008 Nov 24
EventOffshore Technology Conference, OTC 08 - "Waves of Change" - Houston, TX, United States
Duration: 2008 May 52008 May 8

Publication series

NameOffshore Technology Conference, Proceedings
Volume3
ISSN (Print)0160-3663

Conference

ConferenceOffshore Technology Conference, OTC 08 - "Waves of Change"
CountryUnited States
CityHouston, TX
Period08/5/508/5/8

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ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Ocean Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering

Cite this

Masuda, Y., Konno, Y., Iwama, H., Kawamura, T., Kurihara, M., & Ouchi, H. (2008). Improvement of near wellbore permeability by methanol stimulation in a methane hydrate production well. In Offshore Technology Conference, OTC 08 - "Waves of Change" (pp. 1617-1628). (Offshore Technology Conference, Proceedings; Vol. 3).