Determining gradients using a multi-probed formation tester
Device and method for extracting a gas hydrate
Disposal and reclamation of drilling wastes
Down hole pressure intensifier and drilling assembly and method
Downhole cleaner assembly for petroleum wells
Downhole fluid supercharger
Downhole vortex generator
Downhole vortex generator and method
Drag bit for drilling in plastic formation with maximum chip cle
Drill bit
Drill bit and method for reducing formation fluid invasion and f
Drill bit with hard-faced bearing surfaces
Drill bit with suction and method of dry drilling with liquid co
Drill bit with wedge shaped eduction jets
Drill cutting treatment method
Drill cuttings conveyance systems and methods
Drill cuttings disposal method and system
Drill cuttings disposal method and system
Drill cuttings transfer system and related methods
Drill hole filling method and apparatus