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Introduction Since 1990s,due to the development of petroleum exploration technology,petroleum machinery and equipment have been addressed by all nations.By means of heavier investment on technology innovation,adopting advanced technology to develop new equipments by big oil companies,the overall levels of adaptability,reliability,diversity, seriation,integrity,automatization,intelligence are highly improved.In recent years,the technology of exploration and development for oil and gas in China has expanded rapidly,while the technique of drilling and production is approaching world level.As the drilling engineering orients to the directional well,ultra-deep well and complex well,the research and development of downhole tools to match the technique has shown its importance.
Introduction Since 1990s, due to the development of petroleum exploration technology, petroleum machinery and equipment have been addressed by all nations. By means of heavier investment on technology innovation, adopting advanced technology to develop new equipments by big oil companies, the overall levels of adaptability , reliability, diversity, seriation, integrity, automatization, intelligence are highly improved.In recent years, the technology of exploration and development for oil and gas in China has expanded rapidly, while the technique of drilling and production is approaching world level. As the drilling engineering orients to the directional well, ultra-deep well and complex well, the research and development of downhole tools to match the technique has shown its importance.