北部湾盆地勘探井小尺寸隔水导管技术

海上隔水导管设计直接影响到作业安全、工期及费用，在满足作业安全的前提下，如何设计合适的隔水导管来提高钻井速度、降低钻井成本是区域勘探井钻井的关键问题之一。基于边界约束条件，考虑作业海域水文气象季节性影响，建立了小尺寸隔水导管强度设计方法及稳定性分析，并进行了实际应用。结果证实，在北部湾海域非台风季节下作业，小尺寸隔水导管技术可以弥补常规?508 mm隔水导管设计工期长、费用高的问题，同时也能解决?508 mm×?339.73 mm变径组合隔水导管“盲替”固井方式的缺陷。该技术的成功应用，突破了传统常用的?508 mm隔水导管井口稳定需求的限制，为今后北部湾勘探井隔水导管设计提供了新的参考方向，也为后续勘探井可持续发展的安全高效作业奠定基础。

Small-size rise technology and its application in exploration wells in the Beibuwan Basin

The design of offshore riser has the direct effect on drilling safety, cycle and cost, so one of the key issues for the drilling of offshore exploration wells is how to design a proper riser to increase the drilling speed and reduce the drilling cost while ensuring the drilling safety. The strength and stability of small-size riser was analyzed based on boundary constraint conditions, combined with seasonal effect of hydrometeorology in the sea area of the operation. Then it was applied on site. It is proved that as for the operation in the Beibuwan sea area in non-Typhoon seasons, the small-size riser technology can solve the long design time and high cost of the conventional ?508 mm riser and cover the shortage of "blind replacement" cementing of ?508 mm× ?339.73 mm riser assembly. Its successful application breaks the limitation of conventional ?508 mm riser on wellhead stability requirement, provides the new reference for the future design of risers in exploration wells in the Beibuwan Basin, and establishes the foundation for sustainable safe and efficient operation of exploration wells in the Beibuwan Basin in the future.