That didn’t take long to find. Yes, explosives are used in firefighting:
https://en.wikipedia.org/wiki/Oil_well_fire
– “Oil well fires are more difficult to extinguish than regular fires due to the enormous fuel supply for the fire. In fighting a fire at a wellhead, typically high explosives, such as dynamite, are used to create a shockwave that pushes the burning fuel and local atmospheric oxygen away from a well. (This is a similar principle to blowing out a candle.)”