Well Control Technology in Deepwater Well
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摘要: 海洋深水钻井中的井控,面临着海底低温、气体水合物、地层孔隙压力和破裂压力之间的安全窗口比较窄、井控余量比较小、压井/阻流管线较长导致循环压耗较大、深水地层比较脆弱等诸多挑战。针对深水井控中面临的难点,调研了深水钻井中井控设备的要求与配置,详细介绍了深水钻井中早期监测溢流的方法、深水井控的关井方式及压井方法、深水压井后防喷器"圈闭气"与隔水管气的处理,以及在深水钻井中预防水合物形成的措施,以保证深水钻井的施工安全。Abstract: Well control in deepwater faces many challenges,such as low temperature at seabed,hydrate,a small margin between formation pore pressure and fracture pressure,small kick tolerance,the higher friction loss in choke line due to long pipe length,unconsolidated formation,etc.Considering these issues,this paper analyses the requirements and arrangement for well control equipment in deepwater drilling,and presents early kick detection method,well shut-in and killing method,procedure for trapped gas in BOP and riser,and prevention of hydrate from being formed.It can provide a good reference for deepwater drilling.
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Keywords:
- offshore drilling /
- deep water /
- well overflow /
- well control /
- killing well
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