关键词: 积液时间, 临界携液流量, 压力模型, 不稳定产量分析, 临兴区块, 致密砂岩气井

Abstract: Linxing tight gas field is a typical ″ low porosity，low permeability，and low production″ gas field. After the gas well is put into operation，the phenomenon of water producing，the pressure dropping rapidly，and the gas well liquid loading is generally joint. To improve the anhydrous production period of Linxing tight gas well and improve the gas field recovery， we modified the wellbore pressure model of ″ average temperature and average deviation coefficient method″ ，selected the critical liquid carrying model in line with Linxing block，and used the modern production instability analysis method Blasingame and Log-Log characteristic curve to fit the production data before the liquid accumulation of Well LX-X1，to obtain main parameters such as reservoir permeability，fracture halflength， fracture conductivity and well control area. On this basis of historical matching，the production of the well was predicted at constant pressure. Then，the predicted production was compared with the critical liquid carrying the flow of the well to predict the fluid accumulation time of Well LX-X1. The result showed that the liquid loading time of Well LX-X1 was 13 days earlier than the actual liquid loading time. This method has a specific guiding role in predicting the liquid loading time of gas wells and grasping the appropriate time to carry out drainage and gas production measures.

Key words: liquid loading time, critical liquid carrying flow, pressure model, unstable production analysis, Linxing block, tight gas well