American Petroleum Instltute (API). 2011. 30 p.
Hydraulic Fracturing Technology.
Hydraulic fracturing is a technology that was developed in the 1940s and has been continuously improved upon since that time. It has been used in more than one million wells across the U.S., and it has helped produce more than 600 trillion cubic feet of natural gas and 7 billion barrels of oil. The technique is used to allow natural gas to move more freely from the rock pores where it is trapped so that it can be brought to the surface.