FIELD: gas industry.
SUBSTANCE: group of inventions relates to gas industry. Device for drying of a gas well is lowered into the well on a coil tubing inside a tubing and it contains an ejector assembly, a sealing assembly and a liner. At that, ejector assembly comprises housing with check valve installed in it, made with possibility to prevent penetration of working fluid and gas under sealing assembly and to well bottom, a check valve channel, a nozzle communicating with the coil tubing cavity by means of a connecting channel connected through a mixing chamber to a diffuser, and made with possibility to pass gas into small annular space aerating liquid and reducing its hydrostatic pressure. At the same time the channel of the check valve is made interconnected with the mixing chamber, in which the area of low pressure is created, into which the well fluid rushes for mixing with the working fluid. Sealing assembly is configured to fix the device inside the tubing and contains elastic seals. Liner is made with possibility of well fluid intake from the well bottom. Method for drainage of a gas well is lowering and fixation of the device in the well. Further, working fluid is supplied under pressure through coil tubing into the device, creating an ejection effect, and a mixture of well fluid and working fluid is removed through a small annular space. Further, gas is supplied under pressure through coil tubing to the device, supporting ejection and removing the remaining working fluid into a small annular space. After that depression is created in small annular space and the remaining mixture of working fluid and well fluid is removed from the well, thereby drying it.
EFFECT: complete drainage of the water-flooded gas well, increase in the natural gas flow rate of the gas well and resumption of natural gas flow production.
6 cl, 4 dwg
