... ABSTRACT Gas liquid slug flow can induce vibrations in process piping and large scale slugging can cause some oscillations of subsea flexible pipes. Pipe movements should be avoided, as fatigue can lead to pipe failure. Flow transients can also cause pipe failure, water slugs have lifted...

... (exothermic peak locations, induction time, hydrate structure, conversion rate, …), hydrate distributions (either in the flowing liquid or adhering at the top of the line), and pressure drop evolutions. slug flow stratified flow bhr group 2018 conclusion hydrate inhibitor flow assurance hydrate...

... ABSTRACT This study investigates experimentally and theoretically the existence slugs for vertical co-current two-phase flow in large diameter vertical tubing and risers. The slug flow pattern implies the presence of Taylor bubbles separated by hydraulically sealed liquid slugs. Previous...

... and the results of comparison with the field data. 1. INTRODUCTION Intermittent flow, especially the slug flow regime, occurs very frequently in the transport of hydrocarbon fluids in pipelines in the oil and gas industry. The slug flow regime is usually undesirable since the intermittency of slugs causes...

..., it was found that at high pressure, the slug flow region was very narrow. In particular, at low gas-liquid ratios, the prevailing flow regime was determined to be a kind of " pseudo slug flow", which was characterized by large waves that did not quite extend to the top of the line. Simulations...

... ABSTRACT A set of air and highly viscous oil experiments was conducted to analyse the inner flow field of slug flow for low mixture Reynolds number conditions. The unsteady behavior of the wall shear stress profile was measured, modelled, and compared to an existing model. The Constant...

... Abstract The present work uses a quasi-stationary model for predicting hydrate dispersion formations in slug flows. The approach couples a kinetic model for the hydrate formation rate with a model for the unit cell geometry. The mass balance takes into account the phases' consumption rates...

... Abstract Complex piping systems like subsea rigid jumpers and manifold piping may have several bends and changes in the internal bore diameters that significantly affect the fluid flow profile. Consequently, localized turbulence and slug flow are common problems encountered during operation...

... pipelines. Effect of flow development length: Many models/correlations neglect the effect of flow development length on slug frequencies. The experimental study has revealed that this is an important parameter. Introduction Slug flow is a very common flow pattern in pipelines and wellbores...

..., including axial and cross-sectional – particularly vertical-phase distribution, interface structure and wave/slug characteristics. production control production logging liquid viscosity bhr group 2014 pipe inclination reservoir surveillance inclination pressure drop flow regime slug flow...

.... intermittency force balance production monitoring slip node separated flow production logging upstream oil & gas representation bhr group 2014 mass balance flow pattern gas core pipe segment area fraction artificial intelligence node 2 equation slug flow fraction reservoir surveillance...

... Abstract Looped pipelines are evaluated as a method of reducing outlet flow rate fluctuations in multiphase pipelines operated in slug flow. The interference between the slug frequencies of the two pipelines is shown to be largely destructive in nature and acts to reduce outlet flow rate...

... Introduction Gas-liquid two-phase flow in pipes is a common occurrence in the petroleum industry production and transportation of oil and gas. Brito et al. (2013) experimentally observed that slug flow is the most frequent flow pattern observed for medium oil viscosities. This study...

... at a superficial liquid velocity around 0.5–1 m/s (depending on the conditions), and then decreases to zero as the liquid flow rate is further increased. The experiments are reproduced well by the LedaFlow simulations, both in terms of pressure amplitudes and slugging periods. slug flow bhr group 2014...

... reducers to reduce the pressure drop for the transport of single-phase liquids over long distances. flow rate experiment test section holdup bhr group 2012 liquid pressure drop upstream oil & gas slug flow drag-reducing polymer production monitoring production control pipe fluid...

... ABSTRACT: The pressure drop in slug flow of heavy oil and gas in a pipe in the laminar regime is studied. A simple mechanistic model with closure laws from the literature is compared against experimental data for two-phase flow of high viscosity refined oil and atmospheric air. It is shown...

... surface, combined with the Very-Large Eddy Simulation (VLES) approach to cope with turbulence. We will first discuss new results of transition from stratified to slug flow, which agree well with the data as to water hold-up and slug frequency. We will then present new results of bubbly and slug flow...

... ABSTRACT: Hydrodynamic slug flow is the prevailing flow regime in oil production, yet industry still lacks a comprehensive model, based on first principles, which fully describes hydrodynamic slug flow. This paper describes a very simple, time-dependent, two-phase (gas-liquid) model which...

... ABSTRACT: Slug frequency is a critical characteristic of two-phase slug flow for predicting pressure gradient, erosion/corrosion rates, pipeline structural integrity and designing downstream separation and process facilities. Conversely, slug frequency is the least accurately predicted...

... flow rates, there is an inverse relationship between the slug length and frequency. However, the slug length becomes less sensitive to the change in slug frequency at low flow rates. slug frequency slug flow flow rate production monitoring hanratty liquid flow rate phase separator plate...