Method and system for mitigating cable wear in a hoisting system
US11639639B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2019 |
| Grant date | May 2, 2023 |
| Priority date | — |
| Expiry date | Dec 19, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C13/02
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A method for mitigating the effects of cable wear in an active heave compensated hoisting system of an offshore vessel in a locked to bottom mode of operation is disclosed. The method comprises supporting an upper end of a string which is connected to a subsea well from a travelling block of the hoisting system, wherein the travelling block is suspended from a crown block via a cable. The method further comprises operating an active heave compensation system to control a drawworks of the hoisting system to pay in and out the cable to compensate for motion of the offshore vessel and maintain a target overpull in the string. The method further comprises adjusting a ballast system of the offshore vessel to vary the draft of the vessel, and controlling the drawworks in accordance with the variation in the draft of the vessel to cause a length of cable to slip through the hoisting system and maintain the target overpull in the string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.