Let’s take another quiz regarding driller’s method.
Before start the first circulating, you have the following information
Original Shut in Drill Pipe Pressure = 500 psi
Initial Circulating Pressure (ICP) = 1500 psi
After end of 1st circulation of Driller’s Method, the drillpipe pressure gauge and the casing pressure gauge shows that the circulating drill pipe pressure = 1500 psi and casing pressure = 500 psi (see the figure below).
What do you think about this well?
Answer: Everything is looking good. After influx is circulated out of hole, you expect to see casing pressure equal to Initial Shut In Drill Pipe Pressure.
You can read more explanation here > http://www.drillingformulas.com/drillers-method-quiz-no-1
Reference book: Well Control Books