WELL JET DEVICE FOR REMOVING SAND PLUGS FROM BOTTOM HOLES IN THE CONDITIONS OF ABNORMALLY LOW FORMATION PRESSURES

摘要

The invention relates to pumping engineering, mainly to well jet devices for well development. The well jet device for removing sand plugs from bottom holes comprises an ejector pump that is mounted on the flexible tubing string and includes a housing, in which a nozzle and a mixing chamber with a diffuser are arranged coaxially to the tubing string. The housing also comprises made therein an axial channel and a crosswise channel that is used for feeding a working fluid, placed bellow the nozzle and is connected to said axial channel; furthermore, a channel for supplying a medium pumped out from the well is made in parallel to the axial channel, the axial channel is connected to the nozzle by the upper end and to injection nozzles by the lower end, which injection nozzles are arranged under the housing so that they can rotate about the axis of the axial channel under the action of the effluent working medium, while a seal made of an elastic material, for example of rubber, and consisting of not less than two sealing collars separated by metal gaskets is arranged bellow the transversal channel on the outer side surface of the housing. The invention makes it possible to increase in the efficiency of works for breaking sand plugs and to improve the operational reliability of a jet pump.