Oil and gas well stimulation

Details Oil and gas well stimulation Oil and gas well stimulation

1976-06-28

1977-08-02

Novosad, Stephen J.

Wells

Processes

With explosion or breaking container to implode

166 63, 166177, 166250, 166308, E21B 4326

Patent

active

040390306

ABSTRACT:
A method and means for stimulating oil and gas wells to increase production comprises filling a well above the pay zone level with a fracturing fluid, then suspending a cylinder of high explosive centrally within the wellbore adjacent to the pay zone. Thereafter a propellant is suspended within tens of feet above the high explosive and the well above the propellant is enclosed. The application of high explosive is chosen to cause multiple radiating fractures but will not crush the rock in the well. Also, the rise time of the shock wave created by the explosive should be less than the time required for sound to traverse one-half of the periphery of the well opening in the rock at the pay zone. The propellant is detonated first, followed by the detonation of the high explosive. The purpose of using the propellant is to maintain pressure caused by the high explosive over a longer period, thereby extending the fractures caused by the high explosive.

REFERENCES:
patent: 3002454 (1961-10-01), Chestnut
patent: 3029732 (1962-04-01), Greene
patent: 3101117 (1963-08-01), Scott et al.
patent: 3630284 (1971-12-01), Fast et al.
patent: 3848674 (1974-11-01), McColl et al.

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