摘要：The development and utilization of natural gas is beneficial to reduce the consumption of coal and oil in the word, and reduce air pollution. The main reason for the low production level is liquid accumulation in some low-efficiency wells in tight sandstone gas reservoirs in (he Linfen gas field. In order to define the characteristic of liquid loading in in tight sandstone gas reservoirs in Linfen gas field, the principles and characteristics of four type critical flow rate models of liquid unloading were firstly analyzed, and the applicable of critical flow rate model in the Linfen gas field and (he value range of the critical flow rate were calculated. Results indicate that, for the gas wells producing water in tight sandstone gas reservoirs in the Linfen gas field, the calculation results of Turner model and Coleman model of critical flow rate of liquid unloading are in good agreement with the measured results of liquid level; The calculating Turner critical flow rate model is 2.10 x 104m3/d, and that of the Coleman model is 1.75 x 104rrvVd, which means the gas well may produce liquid loading when the gas production of well is less than 2.10 〜1.75 x l〇4mV& in this block; The accu-ratc calculation of critical flow rate of liquid unloading should combine with the pressure and temperature distribution in the wellbore of the real gas wells producing water. The findings of this study are important for understanding the mlc of liquid loading in gas well in tight sandstone gas reservoirs and the efficient application of the corresponding drainage and gas recovery technology.
关键词：Tight sandstone gas reservoir;critical flowrate;liquid unloading;liquid loading;Turner model
