Precise and instantaneous ECD management to address a variety of issues.Ī single-phase hydraulics program for a 6.125-in.Operating within a window between pore pressure (PP) and fracture pressure (FP) that is narrower than the difference between static EMW and equivalent circulation density (ECD) and.Possible elimination of one or more casing strings.Quick and precise response to lost circulation (natural or induced).Allowing immediate response to high- or low-pressure stringers, especially unexpected ones.Reducing or eliminating stuck pipe in depleted formations.Primarily, MPD mitigates nonproductive time by: While UBD and MPD can be carried out with either single or multiphase fluids, this article will focus on single-phase fluid because that is the most common application. Lightweight fluid is the common theme in both underbalanced drilling (UBD) and MPD. MPD utilizes a mud weight whose hydrostatic head is lower than the formation pressure under static conditions. Throughout the process of MPD, the change in the equivalent mud weight (EMW) value is carried out by manipulating the annular pressure from a choke on surface. Simplified technique helps to understand relationship between mud weight and surface-applied choke pressure, impact on drilling hydraulics designĪmong the list of unconventional drilling techniques that include a combination of single-phase and multiphase mixtures of gas and liquid or dual density of two single-phase fluids, managed pressure drilling (MPD) is by far the most commonly used technique today.
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