| Summary: | Master's thesis in Petroleum Engineering Due to energy demands and depletion of the existent reservoirs, the oil and gas industry is expanding new frontier exploration and production works such as in deep-water, HPHT zones and arctic regions. However, due to narrow operational window, drilling with conventional methods in these regions is difficult or even impracticable. The conventional drilling related problems, among others, include 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. This thesis work presents the working principle of MPD variations, field case studies, MPD connection mode and managed pressure cementing (MPC) primary cementing job simulations studies. Results from field case studies show that MPD reduces NPT, increase ROP, reduces loss circulation, increase tripping out speed and reduce the overall drilling days, thus minimizing operation costs. Moreover, MPC simulation study showed the safe fluid placement in narrow operational window that conventional method could not do it. publishedVersion
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