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, working member located in body 1 on partitions 16 and 17 for closing ports 2, pipelines 4 and 5 communicated through ports 2 with hollow body 1. Pipeline 4 and 5 have bottom plates 6 and 7, seals 8 and 9 with axial holes 10 and 11 and separating members 12 and 13. Axial holes 14 and 15 are made in bottom plates 6 and 7. Partitions 16 and 17 has throttling channels 18. Working fluid from wellhead is fed to hollow of body 1. Under pressure of fluid, working member 3 undergoes oscillatory motions and periodically cuts off fluid flow to pipeline 4 or pipeline 5. Bottom-hole formation zone is acted on by positive and negative pressure pulses. Application of the device allows generation of hydraulic pulses at hole bottom at any hole bottom pressure including that equalling the formation pressure. EFFECT: higher efficiency of device operation due to hydraulic pulse treatment of bottom-hole formation zone. 1 dwg