气井中旋流式引射器性能影响因素研究

针对天然气开采过程中串联高压井抑制低压井产气的问题,提出了旋流式天然气引产工艺,利用高压井天然气对低压井进行引产作业,提高产气量。采用数值模拟方法探究螺旋叶片结构参数对引射器内部流场的影响规律。研究发现,在给定工况参数下,改变有旋引射器螺旋叶片的结构参数对引射系数的影响并不大; 改变高压入口压力值对有旋引射器的引射性能存在较大的影响。控制螺旋叶片数量为3,导程为200 mm,径向厚度为20 mm时,在压力为221.3～281.3 kPa时,引射系数均高于0.5。其中,压力为281.3 kPa时,引射系数达到峰值0.558,引射性能达到最佳。流体介质存在杂质颗粒时,有旋引射器能够在保证引射性能的情况下缓解颗粒沉积。

Study on Influence Factors of Cyclone Ejector Performance in Gas Well

In view of the problem that high pressure wells are connected in series to restrain the gas production of low pressure wells in the process of natural gas production, a swirling natural gas induction process was proposed. The high pressure well natural gas is used to induce the production of low-pressure wells to increase the gas production. The numerical simulation method was used to investigate the influence of the structural parameters of the spiral blade on the internal flow field of the ejector. It is found that the change of the structure parameters of the spiral blade has little effect on the injection coefficient under the given operating conditions, and the change of the high pressure inlet pressure has a great influence on the injection performance of the rotary ejector. When the number of control spiral blades is 3, the lead is 200 mm, the radial thickness is 20 mm, and the pressure is 221.3～281.3 kPa, the ejection coefficients are all higher than 0.5. When the pressure is 281.3 kPa, the injection coefficient reaches the peak value of 0.558, with the best ejection performance. When there are impurity particles in the fluid medium, the swirling ejector can alleviate the particle deposition while ensuring the ejection performance.