深水深层井钻井关键技术发展与展望

随着海洋油气勘探开发的不断深入，深水深层井(简称双深井)已成为全球勘探开发热点。双深井比常规深水井面临更加复杂的井下地质环境、海洋环境，作业的风险更大。近年来，随着深水钻井作业的不断进步，当前已初步形成了一套双深井钻井关键技术，包括井身结构、控压钻井、钻井液体系、固井工艺、井控、水下井口、井筒完整性等7个方面。双深井钻井关键技术为加速海洋油气勘探开发提供了技术基础，成果已应用到南海X区块，取得了良好的效果。实践证明，当前双深井钻井关键技术已初步适应深水深层井的钻井作业需要，未来还需推进自动化、规模化、信息化、智能化钻井设备和工艺的研发，以保障双深井安全高效的作业。

Development and prospect of the key technologies for the drilling of deep wells in deep water

As the offshore oil and gas exploration and development advances continuously, deep wells in deep water (referred as the dual-deep well) have become the hot spot of exploration and development all over the world. Compared with conventional deepwater wells, dual-deep wells will face more complicated downhole geological setting and marine environment and greater operation risks. In recent years, with the continuous progresses of deepwater drilling operation, a set of key technologies for the drilling of dual-deep wells have been developed preliminarily from 7 aspects, including casing program, managed pressure drilling, drilling fluid system, cementing technology, well control, subsea wellhead and well integrity. These key drilling technologies provide the technological base for speeding up offshore oil and gas exploration and development. The research achievements have been applied in X Block of the South China Sea and the application results are remarkable. It is practically proved that the key technologies for the drilling of dual-deep wells have preliminarily adapted to the drilling operation requirements of deep wells in deep water, and in the future, it is necessary to promote the research and development of the drilling equipment and technologies of automation, scale, information and intelligence, so as to ensure the safe and efficient operation of dual-deep wells.