... ABSTRACT Slug flow continues to be a disruptive influence on both design and operation of multiphase pipelines and risers. In the past, the focus was largely on slugging cycles driven by the riser or driven by large scale terrain effects which were ultimately accommodated through slug catcher...

... Abstract This paper presents velocity measurements performed in hydrodynamic slug flow in a 212 m long horizontal pipe. A post-processing step has been developed to combine Laser Doppler Anemometry (LDA) measurements with liquid height measurements, such that it is possible to build (i) mean...

...Experimental studies on void fraction in slug of three-phase viscous oil flows in a near horizontal pipe Z Yang 1, B Hu 2, M Langsholt 3, L Liu 3, T K Kjeldby 1 1 Statoil ASA, Norway 2 Flow Capture AS, Norway 3 Institute for Energy Technology, Norway ABSTRACT An experimental study on three-phase...

... be promoted through pipelines. In the case of heavy and extra heavy oil fields, hydrodynamic slug flow is the most common flow pattern. For this reason, it is important to know how this flow pattern behaves as oil viscosity increases in order to improve the operation and design of surface facilities...

...Validation of a physically-based model for slug initiation and evolution in hydrodynamic slug flow C Lawrence, Z G Xu, P Andersson, H Eiding, L Hovden, J Henriksson, S Henriksen, S Dayarathna, T Haugset, T Ruden Schlumberger, SPT Technology Centre, Norway B Hu Flow Capture, Norway 1 ABSTRACT...

... to horizontal 90 bends on the structure and the frequency of the flow. The paper describes how the flow structures in the vertical section develop as it moves downstream the mixing section. It also highlights the effect of centrifugal force on slugs passing around the bend. Finally the flow development...

... in larger diameter pipes including slug and churn flows in horizontal and vertical pipes. WMS is a state-of-the-art device which yields instantaneous void fraction distributions at pipe cross-sections. Several case studies in slug and churn flow regimes, which are widely observed in the oil and gas...

... ABSTRACT Slug flow is a common flow regime in oil production, and the need for accurate physical models relevant for this regime is obvious. The most conventional method for slug flow modelling is the Unit Cell Model (UCM), where the flow is modelled in an averaged way as a series of slugs...

... ABSTRACT Field measurement of slug characteristics is conducted using gamma-densitometers in a 30-in gas-oil-water three-phase pipeline. The pipeline is quite flat with minor elevation changes. The gas, oil, and water flow rates are 66.859 sm3/s (204 mmscfd), 0.078 sm3/s (42,650 sbpd...

... ABSTRACT The formation and evolution of slugs formed in air/water mixture in inclined pipes has been characterized as a function of flow conditions, pipe length and inclination angle. Good agreement was found with model predictions and experimental observations available from literature. Two...

... ABSTRACT Three slug types were found in the new lab experiments carried out in a 2" flowline-riser system with 477 litre volume operating at ambient pressure: severe slugging of type I (which has a liquid slug length larger than the riser height), severe slugging of type II (having a liquid...

...Accurate simulation of intermittent/slug flow in oil and gas pipelines R I Issa1,2, J Castagna2, A Sheikh2 1. Mechanical Engineering, Imperial College London, UK 2. Multiphase Simulation Ltd., UK ABSTRACT The slug capturing method developed by Issa & co-workers is based on the numerical solution...

... amplitude waves and liquid slugs are reported here, together with comparisons with closure relations from the literature. High pressure gas-liquid flows easily develop waves at the interface which sometimes results in the formation of slugs flow given sufficiently large liquid flow rates. A comparison...

... ABSTRACT In this paper we investigate the formation of slug flow in horizontal pipes. We found that a slug is characterized by the memory of the turbulent stresses that formed it. However, the history of other turbulent fluctuations downstream the pipe is destroyed by passing slugs, preventing...

...Evolution of initiated slug velocity along hilly-terrain pipelines E Al-safran Kuwait University, Petroleum Engineering Department, Kuwait G Kouba Chevron Texaco Inc., USA ABSTRACT Terrain slugging is induced by natural transient effect due to liquid accumulation at the dip of a hilly-terrain...

... ABSTRACT Analysis of field data indicates that slugs generated in a near horizontal flowline can develop a long high void zone in front of a low void zone as the slugs move upwards in a high riser. The two void zones are separated by a relatively sharp void front. Reanalysis of Sintef Two...

... ABSTRACT A new theoretical model has been developed for determining flow regime transitions in two-phase gas-liquid flow in horizontal pipes. The theoretical model provides a physical explanation for the development of the perturbed interface of the stratified flow into a roll wave or slug...

... measurements were made using gamma- and X-ray systems capable of discriminating between the two liquid phases. Data were obtained for the time averaged liquid phase hold-ups and, by conditional sampling, the holdup in the bodies of the slugs. Data were also obtained on slug initiation and on the evolution...

... INTRODUCTION In long hydrocarbon transportation lines, when the slope of the pipe continuously changes, the generation of long slugs is likely to occur. In many cases the presence of long slugs in the line is undesirable, because it requires the installation of a larger separator at pipe...

... ABSTRACT Severe slugging is reported from some field operations, when an increase in the production rate leads to a transition from steady stratified flow to slug flow in the pipeline. The slugs can be longer than anticipated for normal hydrodynamic slugging and the flow transients can...