..., but the initial production gains are greater. gas well deliquification production control gradient isavft ltd production logging artificial lift system surfactant production monitoring experiment liquid setup loading surfactant concentration batch injection nimwegen batch foam experiment...

... With an increasing interest in downward two-phase flow, this paper contributes to the literature with a complete set of two-phase flow measurements, including flow pattern, liquid holdup, pressure gradient, and wall shear stress. Low-viscosity oil and air in a 21 m long and 5.08 cm inner...

... for the tested conditions is provided. In addition, the results are compared with model predictions for the critical gas velocities, pressure drop, and liquid holdup. production monitoring transition liquid backflow multiphase production technology reservoir surveillance gradient experiment pressure...