... functions. The flow rates were prescribed at the inlet through the superficial velocities and by means of the liquid hold-up. To specify the liquid holdup a value for the void fraction of 1 was defined for the annular film and 0 in the gas core. At the wall the no slip condition was applied for the velocity...

... (l/sec) qw = water flow rate (l/sec) usg = gas superficial velocity (m/s) usl = liquid superficial velocity (m/s) = pressure change due to friction (bar) pGLV = pressure change through the GLV (bar) = void fraction 1 INTRODUCTION Gas-lift is one of the most common artificial lift techniques...

... and the existence of the two phases with significantly different densities. As the fluid passes through curved pipes or bends, a considerable centrifugal force is applied to the mixture forcing it to separate. Separation is affected by the orientation of the bend giving rise to complications such as void fraction...

... 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...

... catenary riser void fraction separator pressure riser bhr group 2013 upstream oil & gas flexible pipe pipeline international journal china university experiment hybrid riser simulation cranfield university Modelling and validation of severe slugging in laboratory pipeline-riser systems...

... of the mixer (Figure 3). The first two meters can measure any of the two-measurement combinations listed above so as to provide the mixture void fraction and flow rate; the third meter is needed for additional information about one of the phase fractions. In order to determine the individual phases flow rates...

... was then investigated by creating steady state conditions and shutting in the vertical tube at the top to create a transient response. The resulting transient pressure data were analysed using well test interpretation methods. The steady state pressure and void fraction, measured along the tube, were used to validate...

... superficial velocity flow pattern void fraction reservoir surveillance superficial velocity bhr group 2007 production logging Gas/liquid flow in a large riser: effect of upstream configurations N K Omebere-Iyari, B J Azzopardi School of Chemical, Environmental and Mining Engineering, The University...

... to the regime transition line. NEW REGIME MAPS Although parameters including the physical properties of phases could give the best possibility for working out universal flow regime maps, superficial velocities and void fraction are undoubtedly the most convenient when used. Theoretical and experimental data...

... rate, the impeller speed, the void fraction and, as one shows in this paper, by the gas bubble diameter at the pump intake and fluid properties. The two-phase models developed so far to calculate the pump performance, Minemura & 72 © BHR Group 2005 Multiphase Production Technology 12 Murakami (5,6...

... the void fraction downstream of it. It can be applied in gas lifted wells or naturally producing wells with associated gas. In an 18 m high, 72 mm diameter test facility at Shell E&P Technology in Rijswijk several bubble breaker designs have been tested under a wide range of flow conditions...