In 1980s, the World Drilling Technology Conference was held in Vancouver, Canada. Russian experts said that drilling technology was invented by Russians and has a history of more than 200 years. American experts say that their country's drilling technology has a history of 300 years, and it should be invented by Americans. At this time, an expert from China stood up and said that in our country, drilling technology has a history of 1000 years.

Clever use of fan-shaped mud pipes to salvage gravel and soil to further promote drilling technology.

At that time, the villagers used the earliest drill bit in human history, which was recorded as the cutting edge in history books. They used blades to drill into the ground, breaking rocks and driving salt wells deep into the ground. The earliest drill blade in human history is more than two meters long and weighs more than 80 kilograms. The wellhead it opens is only the size of a bowl, which is very in line with the requirements of villagers to hide salt wells. But the wellhead is too small for people to get down, so how to salvage the gravel and soil mined?

The villagers skillfully used the mud fan to knock off all the joints in the middle of a bamboo, leaving a small hole at the bottom and fixing a cooked cowhide on the hole. When placed at the bottom of the well, the liquid will generate upward pressure, push the rubber line away, and mud and groundwater will enter the barrel. When the bamboo tube is lifted, the natural gravity of the liquid produces a downward pressure, which closes the cowhide. So the water in the cylinder is watertight. In fact, the earliest one-way valve appeared in the history of the world. After pulling it to the ground, push the cowhide away with an iron hook, and the water in the bucket will be released.