A jack pump used for oil extraction
Numéro d’image : 11889931
| A jack pump used for oil extraction. These pumps,also known as "nodding donkeys",are used where the natural pressure in the oil well is too low to force oil out at an economic rate. The pump uses a series of non return valves to draw the oil out as the head nods up and down. Such pumps are now becoming less frequently used as new recovery techniques are developed. This photograph was taken in North Dakota,USA | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Parker, David |
| Taille de l’image : | 4877 px × 3663 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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