Oil and gas well underground accident handling device and method

The invention discloses an oil and gas well underground accident handling device and method. The oil and gas well underground accident handling device comprises a body, a driving piston, a reset spring, a supporting ring plate, a torsional spring, a pawl, a pin shaft, a slip claw and a guide head. The method comprises the steps that when fishing operation is carried out, the device is tripped into a well along with a drill column, drilling fluid is circulated to enable the driving piston to move downwards and compress the spring, and the drilling fluid enters the body through the flow dredging holes in the body and is discharged through the drilling fluid flow channel of the guide head; in the process, the piston is driven to drive the slip claw to move downwards, the claw block slides on the reducing section of the guide head, the outer diameter is increased so as to bite the fish tightly, and the fish can be taken out by lifting out the tubular column. The pawl acts with the limiting ...