Drilling Procedures, Techniques And Test Results For A 3.7 Km Deep, 500Degreesc Exploration Well, Kakkonda, Japan

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Journal Article: Drilling Procedures, Techniques And Test Results For A 3.7 Km Deep, 500Degreesc Exploration Well, Kakkonda, Japan

Abstract
The Japanese government-funded geothermal exploration well WD-1A reached a depth of 3729 m in a Quaternary granite, where the bottom-hole static temperature is more than 500°C. This is the highest-temperature formation ever drilled at this depth in the world. A newly developed method was used to cool the sophisticated drilling tools while running them into the hole. A detailed borehole dynamic temperature experiment produced data useful for practical drilling operations. Drill-bit seal conditions were also inspected after use. A total of 14 cores, as well as a fluid sample from the bottom of the well, were taken for scientific investigations.

Authors 
Seiji Saito, Sumio Sakuma and Toshihiro Uchida








Published Journal 
Geothermics, 1998





DOI 
10.1016/S0375-6505(98)00034-0


 

Citation

Seiji Saito,Sumio Sakuma,Toshihiro Uchida. 1998. Drilling Procedures, Techniques And Test Results For A 3.7 Km Deep, 500Degreesc Exploration Well, Kakkonda, Japan. Geothermics. (!) .