 |
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| difficult (oil resources whose production is problematic; запасы); problematic (запасы) | |||
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| difficult (igisheva); hard-to-recover (igisheva) | |||
| трудноизвлекаемые: 23 phrases in 7 subjects |
| General | 1 |
| Oil / petroleum | 3 |
| Oil and gas | 10 |
| Oil and gas technology | 1 |
| Oilfields | 4 |
| Sakhalin | 2 |
| Tengiz | 2 |