Chinese oil and gas company PetroChina has completed drilling on a well that stretches down 9,396 meters in China's largest desert, making it the deepest horizontal well in Asia. The accomplishment marks a major milestone for the Tarim Oilfield, which has entered a new phase of ultra-deep oil and gas exploration below the 9,000-meter level. In recent years, PetroChina has made significant breakthroughs in ultra-deep exploration of high sulfur gas wells using domestically made tools, and the Tarim Basin has become one of the most important strategic areas for increasing production capabilities in China's oil industry.