PERFORATOR FOR CASING PIPES OF OIL AND GAS WELLS Russian patent published in 2003 - IPC

FIELD: oil and gas production, particularly, devices for completion of oil and gas wells. SUBSTANCE: perforator has combustion chamber, chemical fuel, eroding component, additional chemical reagent and nozzle unit. The latter is located on side surface of combustion chamber. Eroding component is made in form of solid blocks or powdery and located in its own vessel and separated in space from chemical fuel and additional chemical reagent. Nozzle unit is multichannel. It may move in direction perpendicular to perforator axis and side surface of casing pipe by former for possible variation of gap between end face of nozzle unit body and casing pipe. Region of action of gas flow on perforating object is connected with perforator combustion chamber, with region accommodating eroding component, and with region housing additional chemical reagent by channels of nozzle unit. EFFECT: higher efficiency of process of casing pipe perforation due to acceleration of perforation process and increased perforating ability of perforator. 5 cl, 4 dwg