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| blue sky exploratory well; exploratory test; pioneer well; preparatory reconnaissance borehole | |||
| wildcat; preliminary prospecting well | |||
| exploratory test well | |||
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预探井 : 12 phrases in 4 subjects |
| Drilling | 3 |
| Geology | 5 |
| Oil / petroleum | 2 |
| Technology | 2 |
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