I just got questions from my friends asking about how casing pressure and drillpipe pressure react while performing the 2 nd circulation of driller’s method.
I have this post for somebody missing about the first circulation of driller’s method – How are pressure and pit volume doing during the first circulation of the driller’s method?
During 2nd circulation of driller’s method, we need to hold casing pressure constant until kill weight mud to the bit and then we will hold drill pipe pressure constant. The reason why we do like this is that we need to maintain the constant bottom hole pressure.
