filon de charbon de Hanna

OBS: Voir aussi «filon de charbon» (ou «filon houiller», «couche de charbon», en anglais : «coal seam») dans TERMIUM.

CONT: Short and medium radius horizontal drilling techniques for coalbed methane recovery have been successfully demonstrated. Short radius technique was used by Gas Resources Institute (GRI)/Resource Enterprises, Inc. in the No. 3 Deep Seam gas well drilled into the Cameo ""D"" coal Seam, Piceance Basin, Colorado. The Department of Energy and GRI used medium radius technique successfully at their Rocky Mountain No. 1 site in the Hanna Basin, Wyoming, targeting the Hanna coal seam at 363 foot depth.