Zigong Shen sea wells located in Da Ruan Xiangjiaba mountain, covers an area of 3 acres, wells 341.4 meters above sea level. The well drilling in the Qing Dynasty fifteen years (1835 AD), which lasted 13 years, only to cut. The depth of the well is 1001.42 meters, which produces both halogen and gas. Shen sea well dug in the Qing Dynasty three years (1823), the light of fifteen years (1835) Zaocheng, which lasted 13 years, depth of 1001.42 meters, is the world's first ultra km oi. Well dressed, every million black bear from brine, Nissan more than 8500 cubic meters of natural gas, burning salt pot of more than 80 by 1940, every day is also flowing black brine more than 10000 Dan, 4800 to 8000 cubic meters of natural gas. Shen sea well built from today's production of the 1.5 century, long time because of the lack of maintenance, underground facilities damage is very serious, after sun repair, sea wells still Nissan about 1500 cubic meters of natural gas. According to the relevant data, after 11 years of drilling in deep wells, Semionov of Russia drilled a shallow well in 1846 and produced a small amount of well oil. 13 years later, only in August 1859, Dirac, the United States, drilled a 21.69 meter deep well and picked up more than 1.8 tons of well oil from the well. In view of this, the Chinese nation is not only a brave and hardworking people, but also has substantial ability and cleverness in the world.