120th JFES Chapter Meeting

We are pleased to announce that the forthcoming 120th JFES Chapter Meeting will be held on April 13th with the detail as follows. We encourage you all to peruse the below program and register your attendance from the link by April 3rd.

This event is designed as hybrid (both online and in-person).

Date & Time: April 13th, Thursday, 15:30 – 17:30 (JST)
On-site venue: 〒810-0004 福岡県福岡市中央区渡辺通1丁目1-1 電気ビルサンセルコ別館8階
Online Participation: The access link will be informed to registrants.
Contact: info (at mark) spwla-jfes.org

司会進行: Takayuki Wada(西日本技術開発株式会社)

Presentation 1:
Magneto-Telluric (MT) method for geothermal resource developments
稲垣 陽大(INAGAKI Haruhiro)(西日本技術開発株式会社)

Presentation 2:
Conceptual Model of Geothermal System and Geothermal Resource Study
副田 宜男(SOEDA Yoshio)(西日本技術開発株式会社)

Presentation 3:
Capturing Transient Phenomena in Fracture Type Geothermal Reservoir and its Applications Using DTS
池田 直継(IKEDA Naotsugu)(西日本技術開発株式会社)
For fracture type geothermal reservoir where impermeable mud cake unlikely forms, transient phenomena associated with commencement, termination or rate change of steam production or water injection is prominently present. If we can accurately capture these phenomena, we may be able to estimate physical characteristics (intrinsic formation water temperature, pressure and permeability index) of each fracture in a relatively short measurement.
DTS can take temperature profile data over the entire borehole at the spatial interval of every 1 meter or so and at the time interval of every 1 minute or so. This powerful feature makes it possible to capture the transient phenomena occurring in the geothermal well as described above. Since the bore hole fluid is essentially water, once the state of fluid (either compressed water, 2 phase consisting of saturated water and steam(+NCG) or steam + NCG) in the well is identified, it is possible to derive fluid pressure based on the temperature profile and well directional data.
Higher the permeability, larger the fracture aperture and for larger the fracture aperture, the fracture is associated with large and more linear plane structure. In this case, from the fractures with similar characteristics found in the nearby wells, we may be able to locate permeable plane present in the field.
And else, the mechanism of estimating formation equilibrium temperature is also the transient phenomena. Because of availability of massive data volume in terms of spatial and time basis using DTS, it is possible to apply similar technique adopted in the pressure transient analysis.
In this presentation, some of the field examples of DTS application will be introduced.


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