13 August 2014 02:26 GMT
The explosion took place late Monday night at the sixth drilling plant of the PetroChina-owned Changqing field during well cementing operations, reported China Business News.
Changqing is one of PetroChina’s largest oil and gas fields with production last year reaching about 1.04 million barrels of oil equivalent per day.
PetroChina’s worst gas exploration took place in 2003 at Kaixian of Chongqing city killing 243 people.
PetroChina could not be reached for comment on Monday's blast.
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