Shut-in Tubing Pressure (SITP)
SITP is the surface force per unit area exerted at the top of a wellbore when it is closed either at the Christmas tree or the blowout preventer stack.
How it’s important to us
SITP can essentially be thought of as the pressure while the well is not being produced. The pressure can come from the formation or an external, intentional source. If the SITP is zero, the open formation is essentially balanced and the well is considered dead. These can be safely opened to the atmosphere. SITP is typically considered on a daily basis, although it is not measured every day (if the well is flowing 24/7, it doesn’t get shut-in), so an engineer would be looking at the most recent.
