Bottom hole liquid loading and unloading technique of low flow pressure and low-liquid gas well

According to the bottom hole liquid loading problems of deep gas well and middle-shallow gas well and characteristics of well condition, two liquid unloading techniques of low flow pressure and low liquid loading gas wells are introduced in this paper. For deep well, the compressed nitrogen is injected regularly through the annular space of ordinary tubing and coiled tubing, thus lifting the liquid from coiled tubing. For middle-shallow gas well, the liquid is pumped to the ground through hydraulic jet pump to reduce the costs. Compared with other lifting techniques, this technique can more effectively reduce the pressure of liquid column on the producing formation. Even when the pressure of producing formation is low, the gas in the producing formation can flow into the well bore smoothly. Thus, the problems of stop production in other liquid unloading techniques when the pressure of bottom hole flow pressure is low are solved properly to increase the effective production period of reservoir bed.