...-phase flow regime test section bhr group 2018 reservoir surveillance upstream oil & gas pressure gradient gas velocity liquid holdup hydraulic diameter Experimental investigation of vertical downward two-phase flow in annulus R P Coutinho, P J Waltrich Louisiana State University, USA...

... vertical orientation before a 3-inch elbow and in a horizontal orientation after the elbow for different flow conditions. In lower gas velocities and higher liquid velocities and viscosities, churn-annular transition and pseudo-slug flow patterns were observed for vertical (before bend) and horizontal...

... is based on the gas velocity being too low to lift droplets from the well. Several investigators have found that the droplet entrainment mechanism is wrong, and that the actual mechanism for wellbore load up is the reversal of the liquid film on the walls of the pipe. The film reversal point corresponds...

... of liquid. The maximum gas velocity at which liquid still remains in the V-section, as well as the liquid holdup and pressure gradient at these (critical) conditions were measured for several combinations of fluids and pipe inclination angles. The results were compared with the predictions of a mechanistic...

... reduction entrainment rate production control gas velocity tpc pressure drop sl 0 higher gas velocity liquid velocity production logging interfacial friction Effect of drag-reducing polymers on Tubing Performance Curve (TPC) in vertical gas-liquid flows P Shoeibi Omrani, J Veltin TNO Heat...

... to gravity forces. As a result, higher liquid velocities are required to have a transition from stratified to non-stratified. test section stratified flow downward flow bhr group 2012 liquid viscosity production logging inclination angle gas velocity criterion university of tulsa reservoir...

... is recorded with a high speed video camera. The tested gas velocities (1–4 m/s) did not give large entrained droplet fractions. The effect of water is to reduce the entrainment and pressure drop. OLGA predicts the pressure drop quite well. 1. INTRODUCTION In order to design multiphase transport lines...

... and a liquid film removal device was used to obtain the entrainment fraction. Two sets of tests were conducted: oil-N2 and water-N2 at pressures up to 1,000 psig, with superficial gas velocities between 2-m/s and 24-m/s, and superficial liquid velocities between 0.002-m/s and 0.1-m/s. Wave measurements were...

... In this study, the occurrence of multiple solutions in stratified flows was investigated. The model equations give multiple holdup solutions for certain flow regimes – in small angle upflows with low liquid velocity (low liquid loading) and with low to moderate gas velocity. We applied a steady...

... Experiments for air-water flow with and without added foamers were performed in a 50 mm diameter 12 m long vertical pipe at ambient pressure. It was observed that adding foamers to water will lead to a lower pressure drop at superficial gas velocities below the transition limit from annular flow...

.... liquid holdup dimensionless force pipe momentum change production monitoring reservoir surveillance experiment annular flow bhr group 2010 weber number slug flow multiphase 7 geometry production control riverin gas velocity flow regime sensor upstream oil & gas production logging...