SUPPRESSING METHOD OF EXPLOSION AND FIRE IN OIL WELL OR GAS WELL

PURPOSE:To suppress the explosion or fire in an oil or gas well by forming a level by excavation after excavating the ground for a shaft or an inclined shaft to make a working place around a pipe and successively cutting and removing an outside pipe casing to expose the innermost casing pipe to cut off the level and providing an injection port to inject muddy water or seawater. CONSTITUTION:A level 13 is formed by excavation so as to continue to a shaft or inclined shaft 12 to be allowed to reach the outermost casing pipe 14 of an oil or gas well and the periphery of the level is further widely excavated to form a working place 15 and outside casing pipes are successively cut and removed by a cutter to expose the innermost casing pipe 16. A cutting-off device 17 is attached to the casing pipe 16 to cut off the oil, gas and water flowing through the pipe and muddy water or seawater is introduced into the pipe from an injection pipe under pressure to suppress the explosion or fire in the oil or gas well. By this constitution, the explosion or fire in the oil well can be suppressed without confronting to danger directly approaching the explosion or fire of the well and newly excavating a well.