Reverse circulation drilling technology has yielded commercial gas flows from the shallow Cretaceous Bow Island formation 57-100% higher than rotary air drilled wells, said K2 Energy Corp., Calgary.

With increasing depth, geothermal energy offers an almost inexhaustible potential for renewable energy. The drilling costs however, rise exponentially with depth in the case of conventional rotary ...

Over the past several decades, various methods have been proposed to evaluate drilling costs and complexity, but because of the large number of factors and events that affect drilling performance, ...