Horizontal Drilling
A drilling technique where the wellbore turns from vertical to horizontal, running laterally through a thin rock formation for thousands of feet. This accesses far more of the resource than a vertical well alone.
Why It Matters
Combined with fracking, horizontal drilling made the U.S. shale revolution possible. The same techniques are now being adapted for enhanced geothermal systems.
Related Topics
Related Terms
Hydraulic Fracturing (Fracking)
A technique that injects high-pressure fluid into rock formations to create fractures, allowing oil and natural gas to flow to the wellbore. Combined with horizontal drilling, fracking unlocked vast shale oil and gas resources in the U.S.
Shale Gas
Natural gas trapped within fine-grained sedimentary rock (shale) formations. Previously considered unrecoverable, shale gas became accessible through hydraulic fracturing and horizontal drilling — the "shale revolution" of the 2000s-2010s.