...-based mud. The simulation results predict that a five-barrel (bbl) gas kick, would reach the wellhead of a 10,000 ft deep, non-circulating, vertical well in approximately 78 minutes. But it would only take 35 minutes to traverse the same well, if the well is circulating at 702 gallons per minute...

... the maximum allowable equivalent circulation densities. Consequences include severe losses, formation damage, and insufficient placement necessitating costly remedial cementing, or even loss of the well. Many wells in one field were abandoned and not completed because of the tight pore-fracture pressure...