新型北极冰区半潜式钻井平台及其系泊定位能力分析

为降低北极海上油气勘探开发成本，迫切需要适合北极作业的海洋工程装备。针对这一问题提出一种可以用于北极海上钻井作业的新型半潜式钻井平台概念。该平台采用6立柱双浮筒形式，平台立柱上部设计为倾斜形式以降低作用在平台上的冰载荷。为保证破碎后的海冰不影响钻井作业，平台设计立管防护装置和锚链防冰装置。分别对平台设计条件、主尺度、系泊系统设计情况进行介绍，并采用商业分析软件对平台在夏季和有冰季节的系泊定位能力进行分析。分析结果表明：该半潜式钻井平台可在北极夏季开阔水域和冬季海面结冰情况下进行钻井作业；平台可在1.0 m厚的海冰作用下保持作业能力，在1.5 m厚的海冰作用下保持自存能力；平台系泊定位能力满足北极钻井作业的要求。

New-Type Semi-Submersible Drilling Platform in Arctic Region and its Mooring Positioning Capability Analysis

In order to reduce the cost of offshore oil and gas exploration and development in the Arctic, it is required to develop equipment capable of operating in the Arctic. A new concept of semi-submersible drilling platform which can be used for offshore drilling in the Arctic is proposed. The platform is composed of six columns and two pontoons, and the upper part of the platform column is designed as an inclined form to reduce the ice load acting on the platform. To ensure the broken sea ice does not affect the drilling operation, the platform is designed with riser protection fence and ice resistance cover for anchor chain. The design conditions, main dimensions and mooring system design of the platform are introduced. The mooring positioning capacity of the platform is analyzed in summer and ice season by commercial software. The analysis results show that: the semi-submersible drilling platform can finish the drilling operation in the open water season and ice covered season in winter; the platform can maintain operation capacity under the action of 1.0 m thick sea ice and survival under the action of 1.5 m thick sea ice; the mooring and positioning capacity of the platform meets the requirements of Arctic drilling operation.