DEVICE FOR PULSE TREATMENT OF WELL WALLS Russian patent published in 2016 - IPC E21B37/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and is intended for recovery of permeability of well walls by washing, in particular, can be used in processing walls of open hole in horizontal well. Device includes housing with bottom rigidly connected from above with cylinder, adapter with pass channel inside concentrically installed in cylinder and hydraulic chamber outside, cylindrical bore in housing, sleeve with nozzle and cover in cylindrical bore with formation of longitudinal channels. In housing inside sleeve with nozzle drain tube is installed axisymmetrically and with ledge and radial holes, made with possibility of providing hydraulic connection of longitudinal channels with hydraulic chamber. Drain tube is rigidly fixed to bottom housing with bolt, barrel forms annular chamber with drain tube, in which there is spring rested on projection. Adapter is equipped with lower and upper rows of radial holes and check valve in adapter pass channel between lower and upper rows of holes. In hydraulic chamber on inner surface of cylinder there are tangential blades allowing cylinder rotate together with housing relative to adapter under action of fluid pressure. Cylinder is equipped with teeth having partial overlapping outside flow passage of upper row of radial holes of adapter with extension of sleeve with nozzle and its return to initial position.

EFFECT: higher reliability, efficiency of processing, avoiding need to adjust pressure.

1 cl, 5 dwg