DEVICE FOR REMOVAL OF FLUID FROM BOTTOM HOLE OF GAS WELLS Russian patent published in 2002 - IPC

FIELD: devices for removal of fluids accumulating at bottom holes of gas wells during period of declining production. SUBSTANCE: device has barrel tightly secured in connecting lock of tubing string. Said barrel forms dead cavity together with tubing internal wall. Located above upper end of barrel is circulating branch pipe forming circular cavity together with tubing. Dead cavity is separated by hollow sleeve into eternal and internal cavities communicated from below with each other. External cavity is limited by tubing inner diameter, and internal one is limited by barrel eternal surface. Sleeve has holes located below holes made in barrel through value of 2d, where d is diameter of holes. Devices are spaced uniformly from one another in tubing string and allow dispersion of fluid accompanying the gas flow due to fluid splitting in device cavity of boundary of difference of velocities of displacement of main flow with circulating flow formed by ejection round circulating branch pipe in whose cavity flows are combined. At low velocities of gas flow in device cavity, when dispersion process becomes ineffective, lifted fluid starts flowing in wall layer to dead cavity of device, where it is diluted with surfactant solution and flows to flowing cavity where its is entrained by ascending gas flow in foamy state and rises to next device, in which it is again accelerated in device flowing cavity to acquire additional pulse to reach stage by stage the wellhead. EFFECT: extended range of varying well production rate, increased preventive work period, improved well operation stability. 1 dwg