BY MARK CRAWFORD
With the easiest petroleum resources tapped, engineers needed better tools
to reach hard-to-get oil and gas. Fortunately, the right technology was already in hand.
Unlock New Oil
Workers prepare a drill site and drill
down to the strata of oil- and gas-
bearing shale, several thousand feet
below the surface.
When drilling approaches the shale,
the drill is redirected horizontally to
run along the center of the strata.
The horizontal leg can run a mile or
more in length.