On this day, 34 years ago, on December 17, 1991 (November 12, 1991, the Bohai Oilfield was dug into the deepest horizontal well in my country. In mid-December 1991, Bohai Petroleum Company dug the deepest and difficult horizontal well in my country at present in Bozhong 28-1 Oilfield. This horizontal well code-named N6-H has a tilt depth of 3,890 meters, a vertical depth of 3,201 meters, and a total horizontal displacement of 1,123 meters. It is also the world's deep footage, large displacement, and difficult one. Comment: In recent years, China's offshore oil production and oil exploration capabilities have continued to improve!