Technologies

For making hole, Oil & Gas well drilling, different technologies have been invented.

Percussion drilling
              Rope 
Drillstring
             With mud 
             Without mud 
Rotating bit
      Full cross-section drilling
              Surface driven
                       Rotary drilling
                       Rotary nozzle drilling
              Subsurface driven
                       Turbine drilling
                       Positive displacement motor drilling
                       Electro motor drilling
        Annular drilling
              Diamond coring
              Shot drilling
Special techniques
        Abrasive jet drilling
        Cavitating jet drilling
        Electric arc and plasma drilling
        Electric beam drilling
        Electric disintegration drilling
        Explosive drilling
        Flame jet drilling
        Implosion drilling
        Laser drilling
        REAM drilling
        Replaceable cutterhead drilling
        Rocket Exhaust drilling
        Spark drilling
        Subterrene drilling
        Terra drilling
        Thermal-mechanical drilling
        Thermocorer drilling

However NoDoC covers cost models for all drilling technologies but have special focus on the rotary drilling technology.