PERFORATOR Russian patent published in 1994 - IPC

FIELD: oil and gas production. SUBSTANCE: perforator has main module in form of hollow body with bottom and guide side nozzles, solid fuel charge located in lower part of the body. Perforator has one or several additional modules successively connected with one another and with main module by means of channels accommodating valves with rod. Channel inlet is overlapped by charge, and its outlet, by igniter. Rod is made with point and longitudinal bores and installed for interaction with igniter. Besides, perforator is furnished with centralizer made in form of three and more movable load-bearing members uniformly spaced over circumference in plane square to module axis. Load bearing members are made in form of piston and rod located in module body walls. Behind-piston space is communicated through channel with module space. EFFECT: higher efficiency with simultaneous reduction of power consumption and amount of equipment due to increased efficiency of action of high-velocity jets on material of well walls. 2 cl, 6 dwg