Fit-for-Purpose Modeling for Automation of Underbalanced Drilling Operations
- Ulf Jakob Flo Aarsnes (Norwegian University of Science & Technology) | Florent Di Meglio (Mines ParisTech) | Ole Morten Aamo (Norwegian University of Science & Technology) | Glenn-Ole Kaasa (Statoil)
- Document ID
- Society of Petroleum Engineers
- SPE/IADC Managed Pressure Drilling & Underbalanced Operations Conference & Exhibition, 8-9 April, Madrid, Spain
- Publication Date
- Document Type
- Conference Paper
- 2014. SPE/IADC Managed Pressure Drilling and Underbalanced Operations Conference and Exhibition
- 4.6 Natural Gas, 1.7.5 Well Control, 3.1.6 Gas Lift, 1.6 Drilling Operations, 5.1 Reservoir Characterisation, 1.11.5 Drilling Hydraulics, 3.3 Well & Reservoir Surveillance and Monitoring, 4.1.5 Processing Equipment, 4.1.2 Separation and Treating, 5.5.2 Core Analysis, 5.6.8 Well Performance Monitoring, Inflow Performance, 1.7.2 Managed Pressure Drilling, 4.2.4 Risers, 5.3.2 Multiphase Flow, 4.5 Offshore Facilities and Subsea Systems, 4.3.4 Scale, 1.7.1 Underbalanced Drilling, 1.10 Drilling Equipment
- Hydraulic Modeling
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Automation has the potential to improve efficiency, precision, and safety of pressure and flow control during underbalanced drilling (UBD). In addition, advanced control theory can be used to extract more information from existing measurements to increase knowledge of the downhole conditions during operation.
An essential part of an advanced (model based) pressure control system is the hydraulic model. Even with high-bandwidth distributed downhole measurements, a calibrated hydraulic model is required to ensure robustness, e.g. to sensor loss, and obtain real time estimates of unmeasured quantities and reservoir characteristics.
In UBD operations, in contrast to Managed-Pressure-Drilling (MPD) operations, the flow in the annulus is inherently a multiphase gas liquid flow, which severely complicates the modelling. Much effort has been put into developing multiphase flow models, however, to date; most of these are too complex, and not suited for real-time applications. Consequently, the main gap with respect to automation of UBD is the lack of a fit-for-purpose model able to reproduce the main characteristics of the multiphase flow in the annulus, while being sufficiently robust and suitable for real-time applications.
In this work, we present recent advances on the development of a simplified fit-for-purpose model of the distributed gas-liquid dynamics, suited for advanced control of UBD operations. Using an automated calibration procedure, the model is shown to retain a
We present recent advances on the development of a simplified fit-for-purpose model of the distributed gas-liquid dynamics, suited for advanced control of UBD operations. We briefly describe the main modeling assumptions. Then, we present an automated calibration procedure that enables the model to retain accuracy despite its relative simplicity and the results are illustrated with a realistic case study. The simplification of the model enables real time coupling of the model with measurements. This is used to produce estimates of unmeasured quantities, such as gas distribution, and to perform reservoir characterization.
|File Size||790 KB||Number of Pages||11|