气体驱动中途测试封隔器研制

doi:10.3969/J. ISSN.1006-768X.2022.03.21

摘要/Abstract

摘要：

气体钻井具有极易发现油气层的效果，一旦钻遇有潜力的新油气层则可能要进行中途测试。气体钻井—中途测试技术关键在于能够在井筒纯气体的钻井环境下直接进行中途测试，有助于及时准确地了解储层性能及所含油气水产量等情况，对于后期完井和开发生产具有重要的指导意义。然而，目前国内外封隔器均设计为在井筒液体条件下工作，无法在井筒纯气环境下工作。文章创新研发了大推力双液缸坐封关键结构，为纯气环境下封隔器坐封及工作提供持续稳定的推力，研制了气体驱动坐封的封隔器。通过钻杆带压送入气体驱动坐封封隔器，实现了气体钻井条件下的中途测试，完成测试后可直接进行完井生产或起出封隔器立即恢复气体钻井继续钻井，提高了钻井—测试—完井效率，助力推进油气井勘探开发步伐。

关键词: 气体驱动, 中途测试, 封隔器, 坐封, 封隔器实验, 气体钻井

Abstract: During gas drilling, it is easy to find oil and gas zones, and once a potential new oil and gas zone is drilled, it may be necessary to conduct drill stem tests. The key to drill stem tests in gas drilling technology is to be able to directly perform drill stem tests in the drilling environment of pure gas in the wellbore, which helps to understand the performance of the reservoir and the production of oil, gas and water in a timely and accurate manner, and has extremely important guiding significance for the later well completion and reservoir development. However, at present, packers at home and abroad are all designed for wellbore liquid medium conditions, and cannot work in a wellbore with pure gas environment. In this paper, a gas-driven DST packer was innovatively developed, and the key structure of high-thrust double-liquid cylinder setting was adopted to provide continuous and stable thrust for the setting and working of the packer in a pure gas environment. The gas-driven setting packer is run into well through drill pipe under pressure to realize the DST under gas drilling conditions. After testing, the well can be directly completed or the packer can be pulled out to resume gas drilling and continue drilling operation immediately. It improves the operation efficiency and reduces the complex downhole risks such as water-sensitive formation collapse, and lays a foundation for the realization of gas drilling-testing-completion integration technology.
Key words: gas drive; drill stem testing; packer; seating sealing; packer experiments; gas drilling

Key words: gas drive, drill stem testing, packer, seating sealing, packer experiments, gas drilling

陈勇, 李陈, 卢齐, 刘眉伶, 温馨. 气体驱动中途测试封隔器研制[J]. 钻采工艺, 2022, 45(3): 114-118.

CHEN Yong, LI Chen, LU Qi, LIU Meiling, WEN Xin. Development of a Gas-driven DST Packer[J]. Drilling & Production Technology, 2022, 45(3): 114-118.

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