m lipour - sharif university of technology
m mahmoodi - sharif university of technology
e dazamzadeh - research institute of petroleum industry

as current reserves deplete , it is necessary to drill to reservoirs that are deeper and more complex, some industry professionals would say that 70% of the current hydrocarbon offshore resources are economically undrillable using conventional drilling methods. managed pressure drilling MPD is a new technology that uses tools similar to those of underbalanced drilling to better control pressure variations while drilling a well. the aim of MPD is to improve the drillability of a well by alleviating drilling issues that can arise authors in this paper made a comprehensive study on feasibly of suing managed pressure drilling MPD in iran oil reservoirs. MPD can improve economics for any well being drilled by reducing a rig's nonproductive time NPT. NPT is the time that rig is not drilling . many of the drilling problems in any well can be reduced by using MPD.

MPD,reservoir rpessure , hydraulic , NPT