For exploiting chengdao Shoal oilfield in Bohai, EngineeringConstruction No.1 Company of Shengli Petroleum Administration Bureau developed a lighterage skid mounted ditching and laying unit.

• 针对渤海埕岛滩海油田开发的需要，胜利石油管理局工程建设一公司研制了驳载拖橇式滩海海底挖沟敷缆装置。