Pressure stability eliminates the effects of ballooning and wellbore instability induced during conventional drilling by repeated pressure charging and relaxation.

Operators achieve pressure stability and constant bottomhole pressure with APD services by eliminating the damaging fluctuations incurred during repeated pumps-on to pumps-off.

Also, by reducing the mud weight operators can reduce solids and skin damage.

The net effect of the lower mud weight and solids is a reduced equivaluent circulating density. That enables operators to drill safely below the fracture gradient even in depleted reservoirs.