DEPTH UNIT FOR VERTICAL MOVEMENT OF HYDRAULIC PERFORATOR Russian patent published in 2000 - IPC

FIELD: oil and gas production industry, specifically, equipment to open productive formations. SUBSTANCE: depth unit includes cylindrical body. Hollow rod is mounted uniaxially to body for movement relative to it and is rigidly coupled in lower part with hydraulic perforator. It forms ring chamber together with body. Piston is positioned in sealed part of chamber filled with viscous liquid. It is made fast to rod and has capillary conduit and non-return valve and support located in ring chamber, under hydraulic part, is made fast to rod and is mounted for movement relative to body. Support from beneath is pressed against body with spring. EFFECT: increased efficiency and operational reliability of depth unit. 6 cl, 4 dwg