Research on performance optimization of gas–liquid ejector in multiphase mixed transportation device

Abstract

In the process of oil and gas extraction, a system that uses a pump and reversing mechanism to achieve high-efficiency export of gas–liquid mixture is devised. A gas–liquid ejector is fitted in the front of the device to boost pressure inside the tank in order to store more gas in the tank under a given volume. To meet the working conditions of gas–liquid high-efficiency transport device and obtain a larger outlet pressure and better ejection performance, this paper investigates the effect of outlet pressure, ratio of throat inlet area to nozzle outlet area and nozzle contraction angle on the ejection performance of gas–liquid ejector, and simulations using the computational fluid dynamics approach. At the same time, an experiment platform is built for testing. The research findings show that the ejection gas flow rate and ejection ratio of gas–liquid ejector decrease with the increase of the outlet pressure; as the ratio of throat inlet area to nozzle outlet area increases, the ejection gas flow rate and the ejection ratio of gas–liquid ejector increase first and then decrease. Different nozzle diameters correspond to different optimal area ratios; under the specified working parameters, with the increase of the nozzle contraction angle, the ejection gas flow rate and injection ratio of the gas–liquid ejector increase first and then decrease, and there is an optimal nozzle contraction angle.

Design and Optimization of Gas–Liquid Vortex Unit Using Computational Fluid Dynamics (CFD) Simulation

“…As discussed in section , possible liquid accumulation on the bottom plate of the cylinder-shaped chamber (see Figures f and h) results in a decrease in the gas–liquid contact time due to the nonuniformity of the gas–liquid layer. A good gas–liquid dispersion (see Figure g) can be obtained by an increase of the gas flow rate as the increased momentum transfer results in higher liquid velocities in the vortex chamber. ,, Some literature on gas–liquid reactor geometry optimization claims that the reactor size affects the gas–liquid velocity inside the reactor. − The cylinder-shaped chamber with a lower chamber height but with the same chamber diameter (as shown in Case 3 in Figure ) is designed to study the effect of chamber volume (chamber height). It should be noted that the chamber volume of Case 3 is still larger than that of the base case.…”

Study on the combination of the annular jet pump and static mixer to improve the fluid‐carrying capacity of gas wells

“…The dimensionless parameter head ratio h indicates the ratio of the energy obtained by the mixed fluid to the energy consumed by the power gas Equation ( 6). The parameter η Equation (7) indicates that the product of mass flow ratio q and head ratio h represents the efficiency of the jet pump,…”

“…Current research on gas‐driven jet pumps focuses on structural features and the effect of different media on their performance. Zhao et al 7 found that the area ratio and nozzle diameter of the gas–liquid jet pump have a significant effect on the mixing performance of the pump, nozzles of different diameters will correspond to different optimal area ratios, and a reasonable combination of structures will raise the efficiency of the pump. Chen et al 8 indicated that the outlet position of the nozzle and the length of the throat are the key factors affecting the performance of the pump.…”

Simulation of the Internal Flow Field of Jet Pumps Using the RANS Method

“…CFD models are an alternative method for studying jet pumps. This method allows the exploration of effects of geometrical [11], [12] and operational parameters [13], [14] on jet pump performance and the internal flow field [15]. Xu et al [16] used Large Eddy Simulation (LES) to investigate the turbulent flow field of an annular jet pump.…”