Hard seal butterfly valve refers to the "hard seal" with metal materials or other hard materials on both sides of the sealing pair. Hard seal of butterfly valve has poor sealing performance, but high temperature resistance, wear resistance and good mechanical performance. For example: steel+steel; Steel+copper; Steel+graphite; Steel+alloy steel; (The steel here may also be cast iron, cast steel, alloy steel, or surfacing and spraying alloy).

China's continental shale oil resource base is rich and has huge potential, and accelerating the exploration and development of shale oil is of great strategic significance to ensure national energy security and the long-term development of the oil industry. In recent years, China has made a series of important progress in shale oil basic research, engineering technology, development understanding and management innovation, and shale oil exploration and development in Ordos, Junggar, Songliao, Bohai Bay, Beibu Gulf and other basins have made major breakthroughs, and shale oil has become an important replacement field to promote domestic crude oil production and stable production. PetroChina gives full play to its role as a "pillar" of energy supply, continuously strengthens the exploration and development of shale oil, and in 2022, shale oil production will exceed 3 million tons, laying an important foundation for accelerating the development of shale oil in China.

After in-depth analysis of the new situation and new tasks facing the current oil and gas exploration, due to the complex geological conditions of continental shale oil in China, shale oil exploration and development is still in its infancy, and high-quality exploration and scale benefit development still face many challenges such as technology and management, and it is necessary to continue to strengthen the theoretical and technical research of shale oil and coordinate research.

At present, China's shale oil has developed to the stage of continental shale oil production, and it is urgent to create a continental shale oil production theory to promote the technological revolution of shale oil. At the technical level, experts combined with typical development cases such as Gulong shale oil, Changqing shale oil and Jimsar shale oil to conduct in-depth discussions on shale oil drilling technology, logging technology, fracturing technology and the application of geological and engineering integration. In order to build a theoretical system for shale oil volume development, develop efficient and low-cost engineering technologies, and innovate management concepts and models, accelerate the implementation of resources and benefit development.