DEEP-WELL PUMPING UNIT FOR TUBINGLESS OPERATION OF WELLS Russian patent published in 2011 - IPC F04B47/02 

FIELD: engines and pumps.

SUBSTANCE: deep-well pumping unit includes oil-well pump containing cylinder, receiving valve, plunger with controlled discharge valve, which is attached to rod string with centralisers, packer made in the form of self-sealing collars, hollow shank with stop, which is equipped below the packer and above the stop with side holes. Upper part of cylinder is connected to branch pipe equipped with side holes and centraliser, and in upper end - with constriction and having inner diametre which is bigger than inner diametre of cylinder and with length which is bigger than length of plunger. Plunger with controlled discharge valve is attached to rod string with centralisers through lower hollow stock the lower part of which (before discharge valve) has the length which is equal to the length of cylinder and tightly passed through receiving valve with possibility of mutual axial movement at restricted axial movement of receiving valve relative to cylinder. Upper end of lower hollow stock, which is equipped with cable inlet, is connected to rod string. Upper end of rod string is connected to lower end equipped with cable inlet of upper hollow stock passed through casing-head stuffing box. To rod string there attached is cable the lower and upper ends of which are tightly passed through cable inlets and cavities of the appropriate hollow stocks. Lower end of cable is connected to bottom-hole sensor, and upper end is connected to secondary instrument on the head. Side holes of hollow shank are made in the form of receiving filters.

EFFECT: higher operating efficiency of the well due to optimisation of operating mode.

2 dwg