Question

In an oil well it is necessary to pump drilling fluid down the drill pipe to cool the drill bit. The fluid flows back up between the drill pipe and the wellbore. If the hydrostatic pressure of the drilling fluid falls below the pressure at the drill bit, the result may be a blowout which is highly dangerous. If the pressure at the drill bit is 700 bar and the depth of the well is 4500 m, what should the minimum density of the drilling fluid be to prevent a blowout?

Answer 1