Project History

WELMA Co., Ltd.
Project History (Summary)

April 2015
Geothermal well (production well, injection well)
Drilling method Location Type Equipment used Depth(m) Diameter(mm) Angle Contract type
Rotary Oita Injection well NE-3000 1,700 8-1/2" Angle Prime contract
Rotary Fukushima Injection well NE-2000 2,500 8-1/2" Angle Prime contract
Rotary Kagoshima Production well NE-3000 3,096 8-1/2" Angle Subcontract
Rotary Oita Production well NE-3000 3,030 8-1/2" Angle Prime contract
Rotary Kagoshima Injection well NE-3000 1,500 6-1/4" Angle Prime contract
Rotary Oita Injection well NE-2000 1,399 7-5/8" Angle Prime contract
Rotary Oita Production well NR-715 583 8-1/2" Angle Prime contract
Rotary Oita Production well NR-715 900 7-5/8" Angle Prime contract
Rotary Oita Injection well TSL-1 596 10-5/8" Angle Prime contract

* Remark: Sidetrack


Geothermal exploration well
Drilling method Location Type Equipment used Depth(m) Diameter(mm) Angle Contract type
Rotary Hokkaido Exploration well NE-2000 1,800 6-1/4" Angle Subcontract
Rotary Oita Exploration well NE-3000 3,003 8-1/2" Right angle Prime contract
Rotary Oita Exploration well NE-3000 3,000 8-1/2" Right angle Prime contract
Spindle Tokyo Exploration well GSR 1,500 5-5/8" Angle Prime contract
Spindle Kagoshima Exploration well TSL-1C 1,500 HQ Right angle Prime contract

Earthquake observation well
Drilling method Location Type Equipment used Depth(m) Diameter(mm) Angle Contract type
Spindle Fukui Observation well TSL-HD 400 8-1/2" Right angle Subcontract
Spindle※1 Fukui Observation well TSL-HD 1,000 8-1/2" Right angle Subcontract
Spindle※1 Hyogo Observation well NR-715 1,700 8-1/2" Right angle Subcontract
Spindle※1 Tokyo, Kanagawa Observation well TBM-88 213 6-1/4" Right angle Prime contract
Spindle※1 Hokkaido Observation well TL-2000 203 6-1/4" Right angle Prime contract
Spindle Fukuoka Observation well NL-55 440 6-1/4" Right angle Prime contract
Spindle※1 Osaka Observation well TBM-70 203 6-1/4" Right angle Prime contract
Spindle Osaka Observation well NR-715 1,530 8-1/2" Right angle Subcontract
Spindle※1 Ehime Observation well TSL-1C 600 10-5/8" Right angle Subcontract
Spindle※2 Fukuoka Observation well NL-55 105 6-1/4" Right angle Prime contract

*1 Remark: Coring included
*2 Remark: 5" finish


Hot spring well
Drilling method Location Type Equipment used Depth(m) Diameter(mm) Angle Contract type
Spindle Nagasaki Hot spring well TSL-1C 1,500 5-5/8" Right angle Prime contract
Spindle Fukuoka Hot spring well TSL-1C 1,500 5-5/8" Right angle Prime contract
Spindle Kumamoto Hot spring well TSL-1C 1,200 5-5/8" Right angle Prime contract
Spindle Saga Hot spring well TSL-1C 900 7-7/8" Right angle Prime contract

Resources survey
Drilling method Location Type Equipment used Depth(m) Diameter(mm) Angle Contract type
Spindle Kagoshima Survey hole NL-55 600 HQ-NQ,BQ Angle Subcontract
Spindle Kagoshima Survey hole NL-55 600 HQ-NQ Angle Subcontract

*Remark: WL method

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