Gas–liquid two‐phase flow characteristics of the jet vortex drainage gas production tool based on computational fluid dynamics

Abstract

This study is aimed at the problems of traditional vortex tools in gas wells, including notable pressure losses and short effective distances. An organic combination of jet vortex drainage and gas production tools was designed and installed without additional power equipment. Based on the liquid film force balance model, gas–liquid two‐phase flow and turbulence models of the jet vortex tool were established with UG and Fluent flow simulation software. The gas–liquid mixture was analyzed before and after the jet vortex tool, and the flow trajectory, pressure loss, liquid volume fraction change, and change rate were examined. According to the simulation results, the comprehensive influence of each structural parameter on the effective working distance was optimized, and optimal structural parameters of the jet vortex tool were obtained. The results indicate that the jet vortex tool reduces the critical liquid‐carrying flow rate and pressure loss and increases the axial and initial velocities of the gas and liquid phases, combined with swirl tool distance model, the effective flow distance is increased correspondingly, and the liquid‐carrying capacity of the gas well is improved.

Performance study of self‐excited oscillatory cyclone drainage tool to improve the efficiency of natural gas well drainage and gas recovery

“…The continuous jet model from Liang et al 14 is cited for comparison to show that the self‐excited oscillating pulse jet used in this paper not only has a stronger velocity boosting effect but is also more advantageous in breaking up droplet particles for airflow carrying. As shown in Figures 3, 4 and 5, at an inlet velocity of 5 m/s and a droplet size of 0.01 mm, the axial velocity at the outlet of the pulsed jet model is more than double that of the continuous jet model, resulting in a significant speed increase.…”

“…In this paper, we focus on the speed boosting effect. In order to verify the reliability of the numerical simulation results, the experimental procedure designed by Liang et al 14 was used as an indicator for the two cyclonic tools, and the setup is shown in Figure 14.…”

“…Liang et al proposed a combined jet and cyclone jet cyclone tool. They observed that the speed boosting effect of the jet device could extend the effective spiral flow distance to a certain extent 14 . However, when there is an upward flow of air, the large droplets carried will cause energy loss when overcoming gravitational potential energy, which limits the time and duration of high velocity flow of fluid and increases the difficulty of carrying fluid.…”

“…They observed that the speed boosting effect of the jet device could extend the effective spiral flow distance to a certain extent. 14 However, when there is an upward flow of air, the large droplets carried will cause energy loss when overcoming gravitational potential energy, which limits the time and duration of high velocity flow of fluid and increases the difficulty of carrying fluid. In order to maximise the fluid velocity without adding additional energy consumption, this paper introduces a new highly efficient jet device, the self-excited oscillatory pulse, 15 into the cyclonic drainage gas extraction technology.…”

Study on Flow Characteristics of Venturi Accelerated Vortex Drainage Tool in Horizontal Gas Well

“…New eddy current tools that are different from traditional structures have also been designed [19]. Liang et al [20], for large pressure loss and short effective distance of traditional vortex tools in gas wells, designed and installed the organic combination of jet vortex drainage and gas production tools. The gas-liquid mixture before and after the jet vortex tool was analyzed, and the flow trajectory, the pressure loss, and the liquid volume fraction change were investigated.…”