Apparatus for well stimulation by gas-air burners

Claim 1

APPARATUS FOR BURNING A MIXTURE OF A FUEL GAS AND AN OXYGEN-CONTAINING GAS TO STIMULATE THE PRODUCTION OF OIL FROM A SUBTERRANEAN FORMATION PENETRATED BY A WELL BORE COMPRISING A LENGTH OF TUBING EXTENDING IN SAID WELL BORE FROM THE EARTH''S SURFACE TO SAID FORMATION FOR CARRYING SAID MIXTURE, A COMBUSTION CHAMBER SECURED TO THE LOWER END OF SAID TUBING, A DELIVERY NOZZLE ASSEMBLY CONTAINING A PLURALITY OF RESTRICTING PASSAGES OF REDUCED CROSSSECTIONAL AREA POSITIONED IN SAID TUBING BETWEEN THE LOWER END OF SAID TUBING AND SAID COMBUSTION CHAMBER, SAID RESTRICTING PASSAGES FORMING THE ONLY COMMUNICATION BETWEEN SAID TUBING AND SAID COMBUSTION CHAMBER TO PREVENT FLASHBACK OF THE COMBUSTION FLAME FROM SAID COMBUSTION CHAMBER TO SAID TUBING, MEANS EXTENDING THROUGH SAID TUBING AND CONNECTED TO SAID DELIVERY NOZZLE FOR INSERTING AND REMOVING SAID DELIVERY NOZZLE ASSEMBLY FROM SAID TUBING INDEPENDENTLY OF SAID TUBING AND SAID COMBUSTION CHAMBER, AND IGNITION MEANS FOR IGNITING SAID MIXTURE IN SAID COMBUSTION CHAMBER.