H2O2 well cleanout leads to explosion

The probable cause of an accidental explosion during a tubing cleanout in an oil well in China was hydrogen peroxide (H2O2) decomposing into oxygen and heat. The explosion destroyed the wellhead and piping. A hydraulic simulation of the explosion validated this conclusion and showed that it was not caused by a mechanical failure. Click here to enlarge imageThe chemical explosion first took place inside the tubing and widely scattered equipment remnants contained deformed metallurgy and recrystalized structures.The accidentAt the time of the cleanout, the tubing string contained oil, water, and gas. The liquid level in the tubing-casing annulus was at 470 m.The job injected 2 bbl (about ...

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