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During a production test, the pressure inside he tubing is decreased as the flowing BHP is much lower most of time than the static one. On the other hand, the pressure on the annulus A side would continue to increase as long as the annulus is closed and this increase will be mainly due to thermal expansion which will increase by increasing flow rate (Higher flowing temperature profile). So here are some tips on how to keep operating in safe conditions during a well test: ~~ Keep monitoring the annulus pressure and bleed off if required when it reaches to a certain value below the MAASP (commonly 80 % of the MAASP would trigger the need for annulus pressure unloading) ~~The common practice is to design the tubing string with the assumption that the inside of the tubing is empty while calculating the MAASP according to tubing collapse. ~~ The actual brine weight inside the annulus should be the one used for MAASP calculation.

@@petroleumtrainingandconsul9300 Thank you!

That is right and Yes, as stated, it is an introductory session not a course and it is intended for students and starters, that is why everything is repeated. Thanks for passing by.

The first trip down to the hole and the last trip out of hole are common to all bits, so we exclude it from the calculations as common factor. Regarding the drilling time is the same as Ur calculations but in a different way for the sake of explaining but Ur way is the easy way for one already understand the concept. Thank you

@@mostafasharaf9738 got your point. Thanks a lot for your time and explanation 😊