DEVICE FOR TREATMENT OF BOTTOM-HOLE FORMATION ZONE Russian patent published in 1995 - IPC

FIELD: gas and oil producing industry. SUBSTANCE: device for treatment of bottom-hole formation zone has hollow body 1 with radial ports 2, communicated through ports 2 with body hollow are pipeline 4 having bottom plate 7, seat 8 with axial hollow 9, by-pass valve 10 with limiters 11 and separating member 12. Made in bottom plates 5 and 7 are axial holes 13 and 14. Installed between partitions 15 and 16 in body 1 is working member 3 for closing ports 2. Partitions 15 and 16 have throttling channels. Working fluid is supplied from wellhead to hollow of body 1 and to working member through channel 17. Under the head of fluid, working member executes oscillatory motion which is accompanied with periodic flowing out of fluid through pipeline 4 or 6 and hydraulic pulse treatment of bottom-hole formation zone with removal of colmatage products from zone. Device allows generation of hydraulic pulses at the bottom hole any bottom hole pressure including that equalling the formation pressure. EFFECT: higher efficiency of device operation due to hydraulic pulse treatment of bottom-hole formation zone with simultaneous removal of colmatage products from zone. 2 dwg