... 4 decades, and the application of that understanding into the engineering discipline of flow assurance that has developed in the same timeframe. Initial test facilities were simple horizontal pipes carrying air and water at near atmospheric pressure and temperature. Then came larger, pressurised...

... in the literature on vertical downward two-phase flow in annulus. The experimental results for downward two-phase flow in the annulus is compared with downward flow in pipes. The comparison results show some differences between downward two-phase flow in annulus and pipes for the liquid holdup and flow regimes...

...Investigation of churn/annular and pseudo-slug flow characteristics before and after pipe elbows A Asgharpour a, P Zahedi a, R Vieira b, M Parsi c, S A Shirazi a, B S McLaury a a Erosion/Corrosion Research Center, The University of Tulsa, USA b MSI International Inc., USA c DNV GL North USA, Inc...

... 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...

...Experimental investigation of two-phase flow regime in an inclined pipe C Vieira, M Kallager, M Vassmyr, N La Forgia, Z Yang Norwegian University of Science and Technology, Norway ABSTRACT Experiments were performed with propose of mapping the flow patterns in two-phase flow in an upward inclinable...

... to be affected most when gap bridging by waves is occurring. 1 NOMENCLATURE fpipe friction factor of a pipe Dh hydraulic diameter [m] Di outer diameter of the inner pipe [m] Do inner diameter of the outer pipe [m] kannulus factor keccentric factor ks hydraulic roughness [m] e = 2Do-Di) eccentricity (normalized...

... of the liquid film on the walls of the pipe. The film reversal point corresponds to the transition between annular flow and wavy annular/churn flow. Using this criterion as the basis, the film reversal point was well correlated by use of a modified Froude number, which was shown to give good results for pipes...

... consisted of three main test sections, with pipe inclinations 0, 0.5 and 90 degrees, and with approximate lengths of 380 m, 380 m and 50 m, respectively. The experiments were performed at system pressures 20, 45 and 85 bara. The primary focus of the campaign was on liquid dominated flows in horizontal/near...

... HT Hydrate formation equilibrium temperature [K] U Real velocity [m/s] z Pipe axial coordinate [m] Z Compressibility factor Greek letters Intermittence factor Pipe inclination [rad] H Hydration number Thermal scooping factor Viscosity [Pa.s] Density [kg/m3] Shear stress [Pa] Phase...

... Abstract This paper describes the design and development of a novel, non-invasive technique for measuring the mixture density of multiphase flows using the mechanical vibration characteristics of a pipe. The instrument comprises a flexible pipe section, a mechanical actuator with a driver unit...

... this is not the case. To give an example, the use of a radioactive source to measure the mixture density, requires a careful analysis of gamma ray attenuation through the pipe wall and the multiphase stream, introduces a number of potential errors and definitely represents a cumbersome device [1]. At the same time...

... traditionally encountered in relatively short length of pipes in offshore production operations. However with the growth of deep-water production, vertical down-comers from platforms to the seafloor may have lengths of several thousand feet. Accordingly, more accurate prediction of pressure drop and liquid...

... Abstract In this work, the flow pattern and drop size development of kinetically unstable oil-water dispersions is studied along a horizontal test section. Experiments with tap water and a low viscosity kerosene oil (5.5 mPa s) are conducted in a 7 m long acrylic pipe with 37 mm ID. Dispersed...

... carried out on relatively smaller pipes and for considerably less viscous fluids. This paper will be reporting the experimental campaign conducted in a 127mm (5 inches) internal diameter using 4.83cP silicone oil. upstream oil & gas artificial lift system liquid flow axial position...

... flow is characterized by a low density ratio and a viscosity ratio that can vary in many orders of magnitude (4). It is not only affected by inertia, viscous, pressure and interfacial forces, but also by the inclination and wetting characteristics of the pipe, the pre-wetting component...

... Abstract An experimental program for measuring the fraction of liquid entrained in the gas stream through a horizontal 3-inch pipe has been conducted. A customized test section was designed and fabricated for this testing, including an isokinetic sampling system designed for pressures up...

... the discontinuous onset of liquid accumulation (due to multiple holdup solutions) for large diameter pipes, which is a very important matter for many wet-gas transport systems. We demonstrate that the current data enables calculation of the interfacial friction factor with unprecedented accuracy for a wide range...

... Abstract An experimental study of vertical two-phase flow was conducted at the SINTEF Multiphase Laboratory using a 55 meter long 4" pipe at system pressures of 20, 45 and 70 bara. One of the main objectives of the campaign was to identify regions with multiple solutions, where two flow...

.... The available slug frequency models have all been developed for smaller diameter pipes. Comparison of model predictions for 6 in. ID pipe with the experimental results has shown that none of the existing slug frequency models could predict the experimental results with even moderate accuracy. The empirical...

... model discrepancy prediction upstream oil & gas production control entrainment fraction two-phase flow fluid dynamics bhr group 2016 pipe discrepancy Uncertainty analysis of multiphase flow Case studies from erosion, sand transport, liquid entrainment models W Dai, S Cremaschi...