DOWNHOLE PUMPING UNIT Russian patent published in 2020 - IPC E21B43/00 F04B47/02 F15B1/00 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to production of oil and, in particular, to installations of borehole sucker-rod pumps. Downhole sucker-rod pump unit comprises wellhead accessories, a string of pump pipes and a rod, bottom-hole sucker-rod pump. Wellhead spherical pneumatic compensator is arranged on the wellhead reinforcement flowline and installed in sealed heat-insulated from the environment chamber. Inside the chamber pit is drilled with depth exceeding depth of ground freezing. Working chamber of the air compensator is hydraulically connected to the well flushing line by means of quick-detachable connections. Bearing case of pneumatic compensator is installed on flange of pipe by means of screw with possibility of adjusting height of bearing case. Pipe is cemented in pit, depth of which exceeds depth of soil freezing, and has perforated holes in upper part of pipe, above ground surface.

EFFECT: technical result is reduction of metal consumption, simplification of assembly and improvement of stability due to combination of support functions and adjustment in single unit, higher efficiency of pneumatic compensator due to reduction of heated volume.

1 cl, 2 dwg