Reverse Circulation VS Conventional Drilling: When is it time to switch?

Here are Some of the Pros for Each Type of Drilling System

Reverse Circulation

Conventional Drilling

  • Cuttings are removed in a controlled environment 
  • More control of your air and less air is needed
  • Lower lifetime operating costs (diesel is expensive!)  
  • Reverse Circulation is usually more efficient  
  • Less borehole stress 
  • More drilling options (flooded, grout through, partial Reverse Circulation) 
  • Tools are cheaper to buy 
  • Pipe is cheaper to buy 
  • Readily available 
  • Bigger differences in closed vs open underreamer diameters. 
  • Less tool parts and cleaning needed 
Table showing conventional drilling sizes, evacuation velocity, efficiencty, and strategies to improve.