This video shows the Surge and Swab effect while tripping (RIH/POOH) and how we can incur in losses even though the bottom ECD seems fine and still we are far from bottom fracture pressure/ECD. Don’t miss it!!
This generally happens in “weaker” formations below the casing/liner shoe, so we need to pay special attention not only at the bottom Pressure/ECD but overall profiles to see how our trips (RIH/POOH) conditions might affect our operations either losing fluid or inducing an influx (kick).
Also be aware of the Surge and Swab effect during your simulations, it might change your design or tripping plans.