managed pressure drilling modeling & simulation (a case study)

Drilling with conventional methods in narrow operational mud windows is difficult or even impracticable# the conventional drilling in such mud windows may lead to lots of drilling problems including drill string sticking, kick and lost circulation# in addition, the problems increase the non-productive time (npt) and costs the oil industry a considerable amount of money#in order to overcome the narrow operational window limits and challenges, managed pressure drilling (mpd) technologies are developed, which are the extension of conventional drilling method#unlike conventional drilling method, mpd methods use equipment and techniques to control well annular pressure precisely and be able to drill through narrow window safely# there are several mpd variations and methods# in this research, some of famous mpd methods are introduced and a mpd field case simulation is done using olga dynamic multiphase flow simulator# simulated field case is a well drilling into 3 layers with different pore & fracture gradients, so operational mud window is very tight which forces the one to drill with a constant bottomhole pressure# controlling bottomhole pressure at a constant value was implemented using surface choke back pressure with the help of a pid controller#