In-situ dragging and putting-down method for deepwater discarded jacket

The invention discloses an in-situ dragging and putting-down method for a deep-water discarded jacket. The operations of inner sludge discharge, inner cutting, outer sludge discharge, transverse dragging and the like are carried out on the discarded jacket; and the jacket discarded in a deep well can be put down in situ. Moreover, an automatic unhooking mode of a steel wire rope and the jacket isprovided, before the jacket topples over, the steel wire rope is dragged to be separated from the jacket, the situation that reverse tension is applied to the steel wire rope and a tug due to inertiawhen the jacket topples over is avoided, the construction risk is reduced, and the safety of equipment and personnel is improved. 本发明公开了一种深水弃置导管架原位拖拉放倒的方法，通过对弃置导管架进行内排泥、内切割、外排泥及横向拖拽等操作，能够将深井弃置的导管架原位放倒，并且本发明中提供了一种钢丝绳和导管架自动脱钩的方式，在导管架倾倒前时，拖拉钢丝绳脱离导管架，避免了导管架在倾倒时由于惯性，对钢丝绳和拖轮施加反向拉力，降低了施工风险，提高了设备和人员的安全性。