What is ultra-deep drilling?

Internationally, wells with a depth of more than 4,500m are generally defined as deep wells, wells with a depth of more than 6,000m are defined as ultra-deep wells, and wells with a depth of more than 9,000m are also known as ultra-deep wells.

The development of the world's deep well drilling technology began at the end of the 30s of the 20th century, when the world's first 4573m deep well was drilled in 1938 and 6255m ultra-deep well in 1949. At present, 4,500m can be drilled globally

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