GEAR FOR HYDRAULIC PERFORATION OF CASING STRINGS BY DRILLING FLUID

摘要

oil production. SUBSTANCE: invention specifically refers to equipment for secondary development of productive pools cut off by casing strings by high-speed jets of drilling fluid. Gear includes hydraulic unit made in the form of hollow housing. Nozzles and fixing unit having hollow case are installed in its radial conduits. Spring-loaded rods having working surfaces intercoupled by threaded connection with circular seals are located in its radial conduits. Internal spaces are separated by elastic cup-separator with filter. Nozzles have rectangular form of section of conduits and are mounted flush with housing of hydraulic unit. Conduits to nozzles are through and are arranged perpendicular to longitudinal axis of housing. Fixing unit has at least three radial conduits with rods put into them. Center rod is turned through 180 deg with reference to two extreme rods. Its cross-section area is equal to summary cross-section areas of two extreme rods. Working surface of rods is reinforced with hard-alloy strips. Elastic cup-separator has volume at least twice as large as volume of three cylindrical spaces when three rods are maximally withdrawn. Filter has shape of cup-separator with slit holes. EFFECT: simplified design and increased operational reliability of gear. 3 dwg