DTH technique was used in well drilling exclusively to dig, accurate, vertical bores, and rotary drilling was used to turn the hole. The Directional DTH system, patented by Atlas Copco, was first used successf. [pdf]
Bazhong became a prefecture-level city in 1993. Its history goes back further; during the and dynasties, it was purportedly a vassal territory of . In the , it was called Bazi. .
Bazhong is located at the southern end of the , and borders province to the north, to the east, to the south, and to the west. Its area is 12,301 square kilometres (. .
The city's GDP accounts for approximately 1.9% of Sichuan's total GDP and ranks nineteenth in the province. In 2017, Bazhong's GDP reached RMB 60.1 billion, representing a rise of 8.1%. The city is. [pdf]
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