Drilling bucket - GIF

Drilling bucket.

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Previously:

Drilling a well by dropping a giant weight - GIF
Drilling crew adding a drill pipe section - GIF
Drilling rig derrick installation - photo
Giant core barrel for drilling foundations - video and photo
Giant geotechnical drilling rig on treads - photo
Large core drilling rig - GIF
Oil drilling rig parts and components - photo
Oil drilling rig walking - GIF

Drilling some sandy soft soil I wonder what would happen if they hit a rock?

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Originally Posted by Ralphxyz

Drilling some sandy soft soil I wonder what would happen if they hit a rock?

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A lot depends on the type of rock. Crumbly gravel rock up to 3 or 4 inches they will keep digging might chance buckets or bucket bottom cutters soft shale limestone or sandstone, much the same even decomposed bedrock but once they hit a stratum of solid hard rock they stop drop in the rebar and pour the pilings If they don't hit a strata as solid as they need by the time they have reached max drill depth they might drop and under reamer to clean out the bottom of the hole to 3 times the bore hole diameter