The drilling incident took place last year at an exploration well in the Mangistau region of southwestern Kazakhstan was possibly the second biggest man-made methane leak ever.
The drilling incident at the exploration well caused a fire that raged between June and December 2023 and released 127,000 tonnes of methane into the atmosphere.
Methane is a potent greenhouse gas traps heat in the atmosphere and adds to global warming.
Leaks from fossil fuel operations are the biggest source of methane emissions.
About 40% of human-caused methane emissions come from such operations.