Video: Identifying Production Enhancement Opportunities by Black Oil Foamer Through Slug Flow Modeling
- Amit Satish Jain (Baker Hughes) | Mark Grutters (Baker Hughes)
- Document ID
- Offshore Technology Conference
- Publication Date
- Document Type
- 2020. Copyright is retained by the author. This document is distributed by OTC with the permission of the author. Contact the author for permission to use material from this document.
- 4.5 Offshore Facilities and Subsea Systems, 4.2.4 Risers, 4.2 Pipelines, Flowlines and Risers, 5.5 Reservoir Simulation, 4.2 Pipelines, Flowlines and Risers, 4.5 Offshore Facilities and Subsea Systems, 1.6 Drilling Operations, 5 Reservoir Desciption & Dynamics, 4.2 Pipelines, Flowlines and Risers, 5.3.2 Multiphase Flow, 4 Facilities Design, Construction and Operation, 4.1 Processing Systems and Design, 1.6 Drilling Operations, 4.1.2 Separation and Treating
- slugging, multiphase flow, black oil foamer
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Ageing offshore oilfields with increasing water cuts can suffer from severe slugging and liquid hold-up in subsea flowlines. Excessive liquid loading in flowline and riser sections results in unstable processing condition on the topside; potentially leading to off-spec crude oil and produced water and in extreme cases to production deferment due to level alarm and trips in production separators. Recently, a novel black oil foamer (BOF) application in the GOM was able to mitigate slugging in a deepwater subsea tieback. The oil based foamer is designed to transition the flow regime from slugging to dispersed flow, allowing gas to sweep liquid to the surface. This paper will describe how steady state multiphase modeling was used to verify if foamer application can result in a reduction of liquid hold up and, hence, production improvement. Additionally, the modeling results will be compared to the recent field trial.
Multiphase flow modeling has been performed for fluids of 23-37 API with a GOR of 400-4,000 scf/bbl with a flowline water cut between 16% and 50%. The fluid data were incorporated in the model with the pipeline geometry and topography, or suitable approximations when data was unavailable. The simulation results provided insight into the flow regime for various production scenarios, and thus, suitability of the oil based foamer technology.
The simulation results showed that the riser switches between slug flow and bubble flow regimes. The mechanism of oil based foamer technology for slugging elimination is a transition from slug flow to annular dispersed flow. Fluid flow models shows good match with slugging seen in field without foamer. Additionally, fluid property was adjusted to incorporate foamer effect on lowered liquid density. This case mimics application of oil based foamer and results in no slugging regime for GOM case, hence improved production rate.
This novel use of multiphase modeling for foamer applications will allow to more accurately identify opportunities for oil based foamer applications, and eventually be able to predict the effect of foamer on system slugging and production enhancement.