WELMA Co., Ltd.
Project History (Summary)
March 2019
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 |
Oita |
Injection well |
NR-715 |
1,700 |
8-1/2" |
Angle |
Prime contract |
| 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
|
1,900
|
8-1/2"
|
Angle
|
Prime contract
|
|
Rotary
|
Hokkaido
|
Exploration well
|
NE-2000
|
2,100
|
8-1/2"
|
Angle
|
Prime contract
|
|
Rotary
|
Oita
|
Exploration well
|
NE-3000
|
2,395
|
8-1/2"
|
Angle
|
Prime contract
|
|
Rotary
|
Hokkaido
|
Exploration well
|
NE-2000
|
1,800
|
8-1/2"
|
Angle
|
Prime contract
|
|
Rotary
|
Hokkaido
|
Exploration well
|
NE-2000
|
2,000
|
8-1/2"
|
Angle
|
Prime contract
|
|
Rotary
|
Akita
|
Exploration well
|
TSL-1C
|
1,800
|
HQ
|
Angle
|
Prime contract
|
|
Rotary
|
Hokkaido
|
Exploration well
|
NE-2000
|
1,800
|
6-1/4"
|
Angle
|
Prime contract
|
|
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
|
|
Rotary
|
Hokkaido
|
Exploration well
|
NE-2000
|
1,800
|
6-1/4"
|
Angle
|
Subcontract
|
Earthquake observation well
| Drilling method |
Location |
Type |
Equipment used |
Depth(m) |
Diameter(mm) |
Angle |
Contract type |
| Spindle |
Fukui |
Observation well |
TSL-1 |
500 |
8-1/2" |
Right angle |
Subcontract |
| Spindle※ |
Fukui |
Observation well |
TSL-1 |
1,000 |
8-1/2" |
Right angle |
Subcontract |
| Spindle※ |
Hyogo |
Observation well |
NR-715 |
1,700 |
8-1/2" |
Right angle |
Subcontract |
| Spindle※ |
Tokyo, Kanagawa |
Observation well |
TBM-88 |
213 |
6-1/4" |
Right angle |
Prime contract |
| Spindle※ |
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※ |
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※ |
Ehime |
Observation well |
TSL-1C |
600 |
10-5/8" |
Right angle |
Subcontract |
| Spindle※ |
Fukuoka |
Observation well |
NL-55 |
105 |
6-1/4" |
Right angle |
Prime contract |
* Remark: Coring included
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
