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Drilling History 2550 - 2315 BC The Egyptians used diamond drilling tools for the construction of the pyramids. 600 - 260 BC Chinese drill up to 14 inch diameter and depths up to 2000 feet. 1126 AD Carthusian monks achieved water drilling up to 1000 feet. 1745 AD First
oil well drilled in France 1810 AD First salt drilling in Germany. 1814 AD Cumberland Kentucky first USA oil well. 1825 AD First cable tool drilling in Europe. 1845 AD The Englishman Beart obtains a patent on rotary drilling methods. 1856 AD First
steam powered rig. 1863 AD First diamond coring in Switzerland. 1878 AD First patent on a two cone bit. 1893 AD Drilling depths reach 2004 m. 1897 AD First offshore drilling in Santa Barbara. 1908 AD First rock bit used. 1925 AD First rotary rig to use diesel engine. 1929 AD First
use of Bentonite as a drill mud. 1933 AD Tricone bit introduced. 1947 AD Drilling depths reach 5418 m. 1953 AD First fully hydraulic rig introduced. 1955 AD First drill ship. 1974 AD Oklahoma drilling depths of 9558 m reached.
Deepest hole now is the Kola Super Deep Hole in Russia at 12.26 km.
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