Apparatus for drilling holes in earth surface

Apparatus for perforating oil and gas wells

Autonomous rapid thermal ice penetrating method and system

Burner apparatus for making holes in coal seams

Burners for flame jet drill

Continuous drilling of vertical boreholes by thermal processes:

Dry geothermal drilling and recovery system

Earth boring apparatus employing high powered laser

Earth boring method employing high powered laser and alternate f

Explosive water jet with precursor bubble

Flame drill channelling method and apparatus for reducing noise

Flame jet tool for drilling cross-holes

Flame jet tool for drilling to great depths

Flexible conduit for effecting lateral channelling in coal or oi

Focused shock spark discharge drill using multiple electrodes

Geothermal energy recovery

High-pressure pipe string for continuous fusion drilling of deep

Hydro-mechanical device for underground drilling

Laser drilling method and system of fossil fuel recovery

Laser spectroscopy/chromatography drill bit and methods