Nowadays, unloading gas wells with coiled tubing is a common application to the field. However, it still lacks of adequate understanding of dynamic behavior of the unloading process. This paper investigates the process of liquid unloading by gas lift with coiled tubing under transient conditions. This unloading process can be divided into three stages: liquid rising in tubing, liquid slug production, and liquid production by entrainment. In each stage, the mass and conversation equations are applied as governing equations. The components of each stage include coiled tubing, coiled tubing-tubing annulus, liquid slug, gas bubble, and liquid film. Empirical correlations have been used for surface gas injection choke, check valve, friction factor, the relationship between the gas bubble and the liquid slug velocity, inflow performance relationship, and black oil fluid properties. From the above, the dynamic model coupling real-time change of inflow performance relationship is developed. The lower upper (LU) factorization and Euler's method are applied to solve the proposed dynamic model in time domain. Among all these variables, the most important ones include gas injection rates, pressures at various locations, length of the liquid slug and gas bubble, and phase velocities. Through the simulation efforts, the mechanism of liquid unloading process is revealed.

Gas lift is commonly constrained by gas availability. This is a pioneering study on liquid unloading with coiled tubing. The results can be applied to design coiled tubing gas lift to optimize the usage of injected gas, choose appropriate pump, and save the energy consumed in gas lift operation.

如今，用连续油管卸载气井是该领域的普遍应用。但是，它仍然对卸货过程的动态行为缺乏足够的了解。本文研究了在瞬态条件下用连续油管气举提升液体的过程。该卸载过程可分为三个阶段：管道中的液体上升，液体团块生产和通过夹带进行液体生产。在每个阶段，质量方程和会话方程都被用作控制方程。每个阶段的组件包括连续油管，连续油管-环空，液塞，气泡和液膜。经验相关性已用于表面气体注入节流阀，止回阀，摩擦系数，气泡与液塞速度之间的关系，流入性能关系，和黑油流体特性。综上所述，建立了耦合实时变化关系的动态模型。运用较低的上（LU）分解和欧拉方法在时域上求解所提出的动态模型。在所有这些变量中，最重要的变量包括气体注入速率，各个位置的压力，液塞和气泡的长度以及相速度。通过仿真，揭示了液体卸载过程的机理。最重要的参数包括注气速率，各个位置的压力，液塞和气泡的长度以及相速度。通过仿真，揭示了液体卸载过程的机理。最重要的参数包括注气速率，各个位置的压力，液塞和气泡的长度以及相速度。通过仿真，揭示了液体卸载过程的机理。

气举通常受天然气供应的限制。这是关于使用连续油管卸载液体的开创性研究。该结果可用于设计连续油管气举，以优化注入气的使用，选择合适的泵，并节省气举操作中消耗的能量。