Fracking well heads

Numéro d’image : 11653015
Fracking well heads
Fracking well heads. Four well heads at a drill pad being used in a hydraulic fracturing operation. Fracking or hydraulic fracturing is a drilling technique used to extract gas from shale deposits. A mixture of sand,chemicals and water is pumped under high pressure from the surface to underground horizontal wells. The pressure forms fissures (fractures) in the shale. The sand keeps the fissures open,allowing gas to flow into the well and rise to the surface. This is part of exploratory drilling being carried out to assess the potential of the Fayetteville Shale in Arkansas,USA
Licence : Droits gérés
Crédit: Science Photo Library / Cunningham, Bill / US Geological Survey
Taille de l’image : 5117 px × 3425 px
Model Release : Non requis
Property Release : Non requis
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