井筒中气液流体上行过程中,段塞流向环状流的过渡是流体流动状态不稳定的根源,这种不稳定性在常规气举和排除气井井底积水时经常遇到。在这两种情况下,从射孔位置到井口,油管中明显的压力下降与表面气流速度的显著上升有关,并可引起流动状态的转变。流动状态的改变会引起流动的不稳定性,应予避免。 During the ascending process of gas-liquid fluid in the wellbore, the transition from slug flow to toroidal flow is the source of instability of the fluid flow state, which is often encountered in conventional gas lift and the removal of water from the bottom of gas wells. In both cases, the significant pressure drop in the tubing from the perforation location to the wellhead is related to a significant increase in surface gas velocity and can cause a change in flow regime. Changes in flow conditions can cause flow instability and should be avoided.