A Dynamic Model of Percolating Gas in a Wellbore
- Espen Hauge | Øyvind Nistad Stamnes (Ocean Riser Systems) | Ole Morten Aamo (Norwegian University of Science and Technology) | John-Morten Godhavn (Norwegian University of Science and Technology)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- June 2012
- Document Type
- Journal Paper
- 204 - 215
- 2012. Society of Petroleum Engineers
- 1.10 Drilling Equipment
- 2 in the last 30 days
- 827 since 2007
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The two-phase dynamics of gas percolating up a vertical well filled with water is described by two ordinary-differential equations and algebraic relations. We model the gas as bubbles distributed with a distribution function along the well. The model is based on first principles and accommodates tracking of the front of the gas. An unscented Kalman filter (UKF) is used together with the model and wired-drillpipe (WDP) pressure measurements to estimate the liquid-holdup profile as the gas is circulated out of the well. The performance of the model and the method of estimation are compared with results from a state-of-the-art simulator.
|File Size||3 MB||Number of Pages||12|
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