View Horizontal Drilling Animation
Marcellus gas wells can be drilled using 21st century vertical or horizontal technologies. Vertical wells are sometimes first drilled in an area to obtain information valuable for planning the drilling of more costly and technically demanding horizontal wells. Marcellus Shale natural gas wells in Pennsylvania are drilled horizontally because it offers access to a larger quantity of natural gas, while disturbing a smaller area on the surface. Both vertical and horizontal Marcellus Shale wells produce marketable quantities of natural gas.
Sources (same animation):
Marcellus Shale Coalition | http://marcelluscoalition.org/marcellus-shale/production-processes/drilling/
Louisana Oil & Gas Association | http://www.loga.la/drilling.html
Creator: John Perez Graphics & Design who specializes in multimedia exclusively for the oil and gas industry.