JET-TYPE APPARATUS FOR WASHING WELLS Russian patent published in 1999 - IPC

FIELD: oil production equipment. SUBSTANCE: jet-type apparatus has body with jet-type pump installed inside body. Made in body are passages for delivery of active medium and passive medium. Installed on body is sealing packer which contains barrel, cylinder, piston, and collar. Located in body and rigidly connected to it is pipe union with its internal space creating passage for delivery of passive medium. Circular space created by external surface of pipe union and internal space of barrel is provided with stopper for isolation from suction space, and it creates passage for delivery of active medium to lower end of piston. In operation of device, active medium exerts its action on piston which leads to isolation of suction zone from delivery zone. Combined operation of jet-type pump and sealing packer makes isolation of annular space more reliable. Design of sealing packer is simplified. EFFECT: higher efficiency. 2 dwg