Once you shut in the well in and obtain shut in drill pipe pressure, you can estimate formation pressure by applying the hydrostatic pressure concept.
This following equation demonstrates you how to figure out formation pressure from the kick analysis.
Formation Pressure = SIDDP + (0.052 x Hole TVD x Current Mud Weight)
I got a question about how an anticline gas cap can create the abnormal pressure. The anticline with gas cap can be the potential high pressurized zone. Because of reservoir connectivity between fluid underneath gas and gas reservoir, it can generate abnormal pressure. This example below demonstrates you how this situation could happen.
Trip margin is an increment of drilling mud density to provide overbalance so as to compensate the swabbing effect while pulling out of hole.
You can quickly calculate how much trip margin required by this following simple equation.
Trip Margin = Mud Yield Point ÷ [11.7 x (Hole diameter – Drill pipe diameter)]
You know how the maximum allowable shut in casing pressure (MASICP) from the leak off test data and your current mud weight in the well. Moreover, you can use the MASICP to determine the maximum influx height that you can be able to control in the well control situation.
The following formula shows how to determine the figure:
Influx Height = MASICP ÷ (current mud gradient – influx gradient)
You know about kick tolerance factor from previous section and you can use it to determine the maximum formation pressure which can be controlled when the well is shut in.
This equation below demonstrates you how to calculate it.
