中国海底油气管道总里程已超过6 500 km,受管道腐蚀、外力、自然灾害等因素引起的管道损伤突发事件时有发生,如何根据损伤事件类型选择快速有效的修复方案,是提升修复效率、降低作业风险以及减少经济损失的关键。结合东海某油气田外输天然气管道裂纹损伤的修复工程,针对损伤管道所处恶劣海况、裂纹密集等特点,创新设计了卡具维修方案。该卡具修复方案突破卡具尺寸限制,对修复卡具合理选型,使1个卡具成功封堵2个泄漏点;制作和使用卡具模拟框架,有效降低了管道防腐层清理工作量,保障了卡具安装的精度;创新了卡具安装方法,避免了恶劣海况带来的施工风险。在最终的实践中,证明了创新卡具修复方案的可靠性,为今后类似海底管道修复工程提供了新思路。

The total mileage of China’s submarine oil and gas pipelines has exceeded 6, 500 kilometers. Sudden pipeline damage incidents caused by pipeline corrosion, external forces and natural disasters often occur, How to select a quick and effective repairing plan according to the type of damage incidents is the key to improve repairing efficiency, reduce operational risk and reduce economic losses. Combining with the repairing project of crack damage of the gas pipeline in an oil and gas field in the East China Sea, and aiming at the severe sea condition and crack-intensive characteristics of the damaged pipeline, the repairing scheme with clamp is innovatively designed. The scheme breaks through the size limitation of clamp and makes reasonable selection of clamp for repair, so that one clamp can successfully plug two leakage points. Making and using simulation framework of clamp effectively reduces the cleaning workload of pipeline anticorrosive coating and ensure the clamp installation accuracy. The clamp installation method of fixture is innovated to avoid the construction risk brought by severe sea conditions. In the final practice, the reliability of this repairing scheme is proved, which provides a new idea for similar submarine pipeline repairing projects in the future.