On the 6th, the JHW91-13 well in the Xinjiang Jimusaer National Continental Shale Oil Demonstration Zone was successfully completed, with a drilling cycle of 7.75 days, a total depth of 5,501 meters, and a vertical depth of 4,031 meters, setting a new record for the shortest drilling cycle for shale oil wells of the same depth in China, achieving a drilling efficiency comparable to advanced levels of similar wells in North American shale oil fields.

Xinjiang Jimusaer shale oil is a typical hard-to-extract continental shale oil in China, characterized by strong reservoir heterogeneity and interbedded mudstone formations. Drilling is prone to complex conditions such as wellbore instability and downhole sticking, posing a world-class development challenge and demanding high precision in drilling technology, on-site management, and collaborative problem-solving capabilities.

In recent years, Xinjiang Oilfield has continuously enhanced the collaborative efforts for optimized and fast drilling in the Xinjiang Jimusaer National Continental Shale Oil Demonstration Zone. By continuously refining the integrated geological-engineering management model and strengthening the joint tackling mechanism between the client and contractor, it has broken down professional barriers between geological research and engineering construction. Meanwhile, integrating cutting-edge technologies such as high-precision seismic imaging and intelligent fault prediction, it has rapidly translated technological iteration results into on-site construction outcomes, comprehensively addressing drilling bottlenecks in complex formations. This has enabled precise and efficient drilling in complex strata, with a continuously improving rate of encountering high-quality oil layers.

While accelerating drilling speed, the construction team strictly adhered to safety bottom lines, implementing a differentiated control model of "one strategy per section" to classify and prevent geological risks: the first section used strong-inhibition drilling fluid to effectively address shallow mudstone shrinkage; the second section applied high-performance oil-based drilling fluid, dynamically optimizing construction processes to effectively manage collapse and leakage risks in fractured formations, reinforcing downhole safety barriers and achieving simultaneous improvements in drilling quality, efficiency, and safety.

The efficient completion of the JHW91-13 well marks a major breakthrough in the integrated geological-engineering collaboration and joint client-contractor tackling efforts in the first national continental shale oil demonstration zone—the Xinjiang Jimusaer Shale Oil Demonstration Zone. It provides a replicable and scalable practical model for optimized and fast drilling of deep shale oil in China.