Method and device for detonating and fracturing scattered objects

The invention belongs to the field of petroleum exploration and development, and relates to a method and a device for detonating and fracturing scattered objects. By the invention, detonated and fractured debris can be completely lifted out of a shaft, and the shaft is prevented from being polluted by falling objects. The detonating and fracturing device comprises a cable protection pipe component, an ignition component and a fracturing bomb component which are connected in turn, wherein the fracturing bomb component comprises a central pipe made of carbon steel or alloy steel and a fracturing powder column arranged at the periphery of the central pipe; a detonating cord is arranged in the central pipe; and the wall of the central pipe is provided with a plurality of through holes for ignition. During operation, the detonating and fracturing device is fed into an oil gas well by a cable and is positioned, a detonator in the ignition component of the detonating and fracturing device is detonated by the cable, the detonating cord in the central pipe of the fracturing bomb component is detonated by the detonator, and the fracturing powder column which is encircled outside the central pipe is directly ignited by detonating gas produced after the detonating cord is detonated through the through holes on the wall of the central pipe, so that the fracturing powder column is quickly combusted; and high pressure is established in the shaft, and a formation is fractured to do work.