Study of a New Method for Calculating Critical Liquid Carrying Flow Rate of Gas Wells

Abstract

The minimum critical liquid carrying flow rate of gas wells is an important parameter in the process of making gas reservoir development plans. At present, Turner equation and Li Min equation in the field are mainly used to calculate the critical liquid carrying flow rate of gas wells. However, the two equations have some limitations, which do not consider the effect of interfacial tension on the critical liquid carrying flow rate. In calculation, the gas-water interfacial tension is simplified as a constant, but interfacial tension is a function of temperature and pressure. In order to calculate the minimum liquid carrying flow rate more accurately, the existing calculation equation is modified while considering the influence of temperature and pressure on interfacial tension. The equation of minimum production is obtained by deducing the minimum flow rate of liquid carrying in gas wells. The actual gas well data is used for example calculation, and the minimum production under different well depth, bottom hole temperature and pressure is analyzed. The results show that considering the interfacial tension when calculating the fluid carrying flow rate of gas wells, the calculated fluid carrying flow rate of gas wells is more realistic.