Ultra-deep hole geologic drilling is a drilling project that studies deep crust and upper mantle geology and mineral deposits, also known as scientific drilling. The depth definition of ultra-deep holes varies with the development of drilling engineering techniques. The use of rotary drilling rigs with a depth of 6,000 meters or more and the use of core drilling rigs for drilling more than 3,000 meters deep are collectively referred to as ultra-deep holes. According to the "Geological Core Drilling Regulations (DZ/T0227-2010)" stipulates that the hole with a depth of more than 3000 meters is defined as a special deep hole.
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