Gas-lift is one of the artificial methods in which gas is injected down the production casing–tubing annulus and enters the production tubing through a number of gas-lift valves. During the production of a gas-lift well, the injected compressed gas might cause changes in pressure, temperature as well as fluid composition. When the temperature of the oil falls below the wax appearance temperature, it leads to the formation of organic wax deposits. Wax precipitation in well tubing and processing equipment might lead to dramatic reduction in production, equipment failures, loss of storage and transport capacity, and loss of efficiency. This paper presents a detailed study of wax formation in a gas-lift well. Taking into account changes in the oil component composition during gas injection, the depth of wax formation has been determined by applying a highly accurate developed algorithm. The optimal operating regime of the gas-lift well has been determined using a compositional multiphase model.

气举是一种人工方法，其中将气体向下注入生产套管-管道环空，并通过许多气举阀进入生产管道。在生产气举井期间，注入的压缩气体可能导致压力，温度以及流体成分发生变化。当油的温度降至蜡出现温度以下时，会导致形成有机蜡沉积物。井管和加工设备中的蜡沉淀可能会导致产量急剧下降，设备故障，存储和运输能力下降以及效率下降。本文对气举井中蜡的形成进行了详细的研究。考虑到注气过程中油成分的变化，蜡的形成深度已通过应用高度精确的开发算法来确定。气举井的最佳运行方案已使用成分多相模型确定。