There is an old adage in the patch: The best place to find oil is in an oil field. Oklahoma has long been considered an oil-rich state. Most annual lists of oil-producing states will find Oklahoma in the top 20%, usually only outpaced by places like Texas, Alaska and California. Advances in technology have allowed operators to unlock more of the state's vast unconventional resources. Oil companies began drilling into the Woodford Shale as early as the 1930s, but it was only in the past decade or so that horizontal wells have been drilled to crack the region's hidden hydrocarbon potential.
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