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- W165890348 abstract "To equip an older jackup, the Offshore Mercury, with a completely workable and reliable top drive at minimum cost and without sacrificing performance, Sonat Offshore Drilling installed a power-swivel drilling system that did not require heightening or strengthening the derrick. An electronic crown protection system was installed to allow the driller use of all available reduced crown clearance, thereby increasing drilling safety by reducing the probability of accidentally running the traveling block into the crown. In addition, they modified the DC-DC drilling power equipment to create a completely functional and low-cost alternative to installing additional AC power-generating capacity and an SCR system. When planning a cost-effective top-drive installation on the Offshore Mercury, they recognized that the rig did not fit the average jackup profile: It has a DC-DC electric power drilling system and only a 140-ft (43-m) derrick, rather than the more common SCR system and 147-ft (45-m) derrick. From costs studies made up to the middle of 1991, they believed they could save a significant amount if it were possible to install and use a top drive in a 147-ft (45-m) or even a 140-ft (43-m) derrick without having to extend and strengthen the derrick. This paper reviews themore » design of this system and the effectiveness of its performance.« less" @default.
- W165890348 created "2016-06-24" @default.
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- W165890348 date "1993-09-01" @default.
- W165890348 modified "2023-09-27" @default.
- W165890348 title "Reducing the cost of top-drive installation" @default.
- W165890348 hasPublicationYear "1993" @default.
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