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- amplitude (1)
- analytical solution (1)
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- axial (1)
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- axial velocity (1)
- bhr group 2013 (2)
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**File Type**

Birvalski, M. (Delft University of Techonology) | Tummers, M.J. (Delft University of Techonology) | Delfos, R. (Delft University of Techonology) | Henkes, R.A.W.M. (Delft University of Techonology and Shell Projects & Techonology)

This paper reports on an experiment aimed at obtaining detailed velocity fields in a wavy liquid layer in stratified air/water pipe flow. By combining Particle Image Velocimetry (PIV) with an interface detection technique, the velocity field is resolved from the pipe wall to the interface. Furthermore, since the shape of the interface is resolved at each time instance, this information is used in a phase-averaging procedure, which provides the phase-resolved velocity profiles. These profiles are then used to separate the wave-induced motion from the turbulence-induced motion in the liquid layer. In this way, two different wavy regimes (one laminar and one turbulent) are analysed. The results of the measurements are compared to theory of waves and turbulence.

amplitude, Artificial Intelligence, axial, axial distance, axial velocity, bhr group 2013, case 1, case 2, crest, fluctuation, interface, liquid layer, pipe, production control, production logging, production monitoring, radial, Reservoir Surveillance, Reynolds, shear stress, trough, turbulence, Upstream Oil & Gas, velocity profile, wavelength

SPE Disciplines:

Goeree, J.C. (Delft University of Techonology) | van Rhee, C. (Delft University of Techonology) | Bugdayci, H.H. (IHC Merwede)

A continuous numerical flow model is introduced. The flow consists of a liquid and a sediment phase. The sediment is modeled as a continuum and consists of several particle fractions and sizes. The momentum equations are solved numerically with the fractional step method. The equations are discretized using the Finite Volume Method with a collocated scheme. The fraction velocities are obtained by transport equations. Hindered settlement is taken into account. A Bingham model is used describing the sediment bed. An analytical solution is compared with the numerical calculation for a Bingham material. Finally an erosion case is presented and discussed.

analytical solution, bhr group 2013, Bingham, Bingham material, calculation, concentration, continuous flow model, deformation, equation of state, Fluid Dynamics, fluid modeling, fraction, particle, phase velocity, relation, relative velocity, reservoir simulation, Richardson, sand bed, sediment, total volume concentration, Upstream Oil & Gas

SPE Disciplines:

We have carried out laboratory experiments for the phase split of a gas-liquid flow from a single flowline to a dual riser. The facility used for the experiments is the air-water loop at the Shell Technology Centre in Amsterdam. The 2” diameter loop consists of a 100 m long flowline followed by a dual 15 m high vertical section. The two risers are connected to the same separator at a platform that is operated at atmospheric pressure. The set-up includes a non-symmetric side-branch T-splitter, of which both the side arm and the run arm result in a vertical riser (Riser 1 and Riser 2, respectively). All experiments were conducted with slug flow conditions in the incoming flowline. It has been observed in the experiments that the liquid phase preferentially flows into Riser 2, while the gas phase is predominantly diverted through Riser 1. However, due to the vertical orientation of the risers, this maldistribution can result in gravity dominated flow in Riser 2. As a result, quasi-stable modes form in the dual riser system. These can imply extreme situations, like a fully liquid-filled Riser 2 or partial separation of the phases over the two risers. Each mode has a typical riser base pressure. It was observed that manual choking can influence the phase split (albeit to a limited extent), and is capable of switching the system between the quasi-stable modes. For specific combinations of valve openings and flow rates, Riser 2 experiences a severe slugging cycle. As a result, the phase split shows strong transient behaviour, either with constant cycle times or with an irregular time dependence. Also here manual choking can influence the characteristics of the cycle and is capable of completely suppressing it.

SPE Disciplines: Facilities Design, Construction and Operation > Pipelines, Flowlines and Risers > Risers (1.00)

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