如东长江超长距离定向钻穿越设计

Rudong Yangtze River Extra-long Directional Drilling Design

如东长江定向钻穿越长度3 300m,为管径711mm管道穿越长度的世界之最,穿越地层主要为粉砂、粉质黏土层。由于本工程穿越长度为世界之最,没有相关的设计和施工经验,面临钻杆易断裂、导向孔对接难度大、防腐层易破坏等问题,而且其两岸经济发达,道路和民房、工厂等结构物遍布施工场区周边,回拖场地十分受限,设计新的计算方法和设计思路解决了以上诸多问题,并在施工中成功实施,确保了长达3 300m长江天然气管道穿越工程的顺利完成,可为今后同类型江河定向钻穿越工程的设计和施工提供借鉴与参考。

Rudong Yangtze River directional drilling 3300 min length,is the longest of the D711 pipeline crossing,mainly through the formation of silt and silty clay.As this pipeline is the longest in the world,no relevant design and construction experience can be learned and the project faced problems of easy to break drealing,difficulty in docking pilot hole and possible damage of the coating.The pullback site is very limited when the engineering acrossing the river with cross-strait economic development,roads,houses,factories and other structures around the periphery of the construction site area.To solve all these problems,new technology was used for the design of this drilling and new ways were successfully applied to the construction.They ensured the successful completion of the 3 300 m Yangtze River natural gas pipeline crossing project.This success can provide a reference for the design and construction of the next river of the same type of directional drilling project.