In order to prevent the severe slugging flow regime in multiphase transport pipelines, active feedback control is the recommended solution. Instead of elaborated models such as CFD and OLGA models, a simple dynamical model with few state variables is required in a model-based control system. We propose a new simplified dynamical model for severe slugging flow in pipeline-riser systems. The prop...

Floating, Production, Storage and Offloading “FPSO” have become a popular choice since 1980s for marginal and fast-track developments where subsea pipeline is not an economic or feasible solution for export. Field development usually starts with a concept selection procedure which is constituted from a sequence of multi-disciplinary decision making tasks. As limited data is availabl...

Anti-slug control applied to two-phase flow provides a very challenging and important application for feedback control. It is important because it allows for operation that would otherwise be impossible, and challenging because of the presence of both RHP-poles and RHP-zeros. To conduct experiments on pipeline-riser anti-slug control, a small-scale slug-loop has been build. The loop has been mo...

The optimal design of risers for castings has been the subject of numerous investigations and this paper determines the optimal dimensions when Chvorinov’s rule for solidification is obeyed by both the riser and casting and solidification time is the only constraint involved .This problem can be formulated to minimize the riser volume subject to the constraint that the riser solidification time...

This paper addresses the issues of slug detection and characterization in air-water two-phase flow a vertical pipeline. A novel non-invasive measurement technique using continuous-wave Doppler ultrasound (CWDU) bandpass power spectral density (BPSD) is proposed for multiphase applications compared with more established gamma-ray densitometry measurement. In this work, analysis time-frequency CW...

This work investigates the impact of elevation on terrain-induced slugging in a riser system. Fluid compositions were modeled with multiflash and exported to OLGA readable PVT Table File. Pipeline materials properties geometry different develop flowline model. Two geometries (1 2) elevations defined establish their effect accumulated liquid volume flow, surge volume, slug length, number slugs d...

A brief review of recent literature on riser design is presented and a concise description of the design process is given. Effects of hydrodynamical design parameters on marine flexible riser design are then reviewed. Riser dynamic analyses are described which substantiate design criteria for the selection of riser configuration in deep and shallow water. The results of dynamic analyses using c...