目前,国内许多低渗透气田已进入低压、低产生产阶段,许多气井因积液而危害其正常生产,正确判断气井井底积液是有效开发此类气田的前提。针对低压、低产的特点,以李闽模型为基础,敏感性分析了井口压力、温度对气井井口临界携液流量的影响;同时,考虑到气井压力、温度是沿井深变化的,计算了不同井深对应的临界流量,最终通过实例井验证了该方法的正确性,得出如下认识:在预测气井临界携液流量时,对于低压气井,应先求出沿井深的压力和温度分布,再求解出沿井深的所有临界流量,最终以最大值为准。不考虑临界流量沿井深的变化会造成积液预测误差大。井口压力的降低或井口温度的增加均会降低气井临界携液流量,有利于气井携液;同时,高压气井临界携液流量易出现在井口,而低压气井临界携液流量易出现在井底。 At present, many low-permeability gas fields in China have entered the stage of low-pressure and low-yielding production, and many gas wells endanger their normal production due to effusion. Correctly determining the bottom-hole fluid accumulation in gas wells is a prerequisite for the effective development of such gas fields. According to the characteristics of low pressure and low yield, based on the Li-Min model, the effect of wellhead pressure and temperature on the critical carrying liquid flow in wellhead is analyzed. At the same time, considering the pressure of well, the temperature changes along the well depth, Corresponding critical flow rate, the correctness of the method is verified by example wells finally, and the following conclusions are reached: When predicting the critical liquid carrying capacity of a gas well, the pressure and temperature distribution along the well depth should be obtained first and then solved All critical flows along the depth of the well, whichever is the maximum. Regardless of the critical flow rate along the well depth changes will cause fluid prediction error. The decrease of the wellhead pressure or the increase of the well head temperature will reduce the critical carrying liquid flow of the gas well, which is favorable for the gas well to carry liquid. Meanwhile, the critical liquid carrying capacity of the high pressure gas well is easy to appear in the well head.