#TITLE_ALTERNATIVE#

• Main Author: NUR EL AKMAL (NIM 12205031); Pembimbing: Dr.-Ing. Ir. Rudi Rubiandini R.S., PUTRI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/14394
• Institution: Institut Teknologi Bandung

Managed Pressure Drilling (MPD) is a drilling technique which control annular pressure and attempt to keep it inside pressure window. Usually MPD is applied on rough formation, such as formation with narrow pressure window, where formation pore pressure very closed to formation fracture pressure. If conventional drilling (overbalanced drilling) is applied in this kind of formation, drilling problem such as lost circulation and stuck pipe would occur that would greatly increase drilling cost, moreover the target depth can not be safely or economically reached. Variations of MPD technique have been developed and Constant Bottom Hole Pressure (CBHP) is one of MPD variant that can mitigate that problem. In CBHP mud density lighter than Equivalent Mud Weight of pore pressure is used, but unlike underbalanced drilling, MPD doesn't want to invite influx, it wants to reach slightly overbalanced condition. Hence, surface backpressure is applied when the mud is not circulating and adequate annular friction pressure is created when the mud is circulating to compensate the conventional mud column pressure.<p>Hydraulic parameter is parameter that would affect the annular pressure. This paper discusses calculation method to determine important hydraulic parameter in CBHP-MPD operation, optimum pump rate, and surface back pressure. From this study, optimum pump rate can be determined by optimizing bit hydraulic and it will be between minimum rate for mud to be able to transport cutting efficiently and maximum rate which can make turbulent flow or make fracture in the formation. Backpressure will be equal to annular friction pressure, to make the bottom hole pressure remain constant.