MPD Well Control During Non-Drilling Operations

Abstract This study aims to advance the understanding of influx management in Managed Pressure Drilling (MPD) operations. Despite industry efforts to improve kick management using Coriolis flow meters in combination with algorithms for influx volume estimation, and well-established processes for kick circulation, such as Influx Management Envelope (IME) and the MPD matrix, there is still a literature gap regarding kick management with the bit off bottom - a common scenario during tripping, reaming, mud displacement, or running liners. The identification and control of a kick with the bit off bottom introduces additional complexities, including pipe movement, fluctuating pump pressures, the absence of Equivalent Circulating Density (ECD) readings at the well's total depth (as the bottom hole assembly is off bottom), and temperature effects. These factors may lead to misinterpretations during off-bottom operations, potentially resulting in false alarms. Attempting to control a kick with MPD using drilling procedures may lead to elevated surface pressures or unnecessary and costly killing operations with heavier mud. This work focuses on analyzing the risks and consequences associated with controlling kicks off bottom with the MPD system while exploring potential solutions, considering both false alarms and true kicks into the wellbore. The analysis is supported by hydraulic simulations and insights from real field experience. The outcomes of this study will serve as a comprehensive guideline to enhance understanding, mitigate risks, and further development of influx management procedures for MPD, expanding coverage beyond drilling operations to include off-bottom scenarios.