南海陵水17-2深水气田开发钻完井工程方案研究与实践

Research and practice on drilling and completion engineering scheme of LS17-2 deep water gas field development in South China Sea

陵水17-2气田是中国海油在中国南海自主勘探发现的第一个自营深水大型天然气田。针对该气田开发面临的气藏位置分散、水深跨度大、压力窗口窄、储层疏松易出砂等钻完井技术挑战,研究提出了分散式深水气藏开发钻完井总体布局定量评估、复杂地质环境开发井安全钻井、弱胶结边底水气藏高效完井等关键技术,建立了大跨度深水气田钻井井间移位及规模化深水表层批钻方式,优选形成了适合于该气田开发的钻完井工程技术方案。工程实践表明,该套钻完井工程方案有效支撑了陵水17-2气田安全高效钻完井作业,方案研究思路与关键技术对于未来南海深水油气田开发具有一定的指导意义。

The LS17-2 gas field is the first self-operated deep-water large-scale natural gas field discovered by CNOOC in the South China Sea.In view of the drilling and completion technical challenges faced by the development of this gas field,such as dispersed gas reservoir locations,large water depth spans,narrow pressure windows,loose reservoirs and easy sand production,etc.,the key technologies such as quantitative assessment of the overall layout of drilling and completion for the development of decentralized deep-water gas reservoirs,safe drilling of development wells in complex geological environments,and high-efficiency completion of gas reservoirs with weak cemented edge and bottom water,were put forward;the large-span deep-water gas field drilling inter-well dislocation and large-scale deep-water surface batch drilling methods were established;and a drilling and completion engineering scheme suitable for the gas field development was optimally formed.Engineering practices show that the drilling and completion engineering scheme effectively supports the safe and efficient drilling and completion operations of the LS17-2 gas field,and the research ideas and key technologies of this scheme have certain guiding significance for the future development of deep-water oil and gas fields in South China Sea.