Conventional Type Oil Drilling Rigs
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- IHI To Build World's First Mobile Arctic Caisson Rig For Beaufort Sea Maritime Reporter, Oct 15, 1981 #55
Ishikawajima-Harima Heavy Industries Co., Ltd., jointly with Mitsui & Co., Ltd., both of Japan, recently received an order for a mobile Arctic caisson rig, the first of its kind in the world, from Gulf Canada Resources Inc., a group company of Gulf Oil of the USA. The contract was concluded recently between the parties concerned in Canada.
The steel caisson rig, to be used for oil development in the Arctic Ocean, will measure 111 by 111 meters (364 by 364 feet) in the lower section, 86.6 by 86.6 meters (284 by 284 feet) in the upper section, and 29 meters (95 feet) in height, and have a working water depth of 21 meters (69 feet). The total weight will be about 33,000 tons.
To be built at IHI's Aichi Works, the huge caisson rig will be delivered toward the end of March 1984 and then towed to the Arctic Ocean.
The drilling rig will be used for the oil development now being conducted in the Canadian Reaufort Sea by Gulf Canada Resources Inc. Conventional type oil drilling rigs cannot be used in the Arctic Ocean because of severe problems with solid and drift ice. As a result, the usual method has been to install rigs on artificial islands constructed of earth or sand. This method requires that a new artificial island be constructed in the harsh working environment every time the drilling point is changed.
The new mobile Arctic caisson rig can be seated on a simple foundation built in the sea. When drilling at any point is completed, the rig is floated and moved to the next drilling point, as in the case of conventional rigs.
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March 2024 - Marine Technology Reporter page: 39Photo courtesy Global Ocean Design Figure 7 A 35Ah AGM lead-acid battery is tested using the West Mountain Radio CBA to show the effect of simply ? lling the battery voids with mineral oil as a compensating ? uid. The CBA is programmed to cut-off at a voltage of 10.50v. The top line (red) shows the
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March 2024 - Marine Technology Reporter page: 38LANDER LAB #10 Photo courtesy West Mountain Radio Photo courtesy of Clarios/AutoBatteries.com Figure 6 The West Mountain Radio Computerized Battery Analyzer (CBA V) attaches to a Figure 5 laptop by a USB-B cable, and to a battery by Powerpole® Connectors. Exploded view of an AGM lead-acid battery.
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March 2024 - Marine Technology Reporter page: 37miscible barrier ? uid heavier than seawater (sg=1.026) and lighter than the battery electrolyte (sg=1.265). The original cell vent cap was screwed into the top of the riser pipe to vent the gases associated with charging. Wires were soldered to the lead (Pb) posts. The lead-acid battery was additionall
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March 2024 - Marine Technology Reporter page: 36LANDER LAB #10 Of special interest for marine applications, LiPo batteries are Shipping any kind of lithium battery can be a challenge, and offered in a “pouch” design, with a soft, ? at body. The pouch IATA regs vary with the batteries inside or outside an instru- is vacuum-sealed, with all voids ?
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March 2024 - Marine Technology Reporter page: 33regulated industry in the world.” How- ever, commercial success depends on many factors, not least a predictable OPEX. Over the past four years, SMD has worked with Oil States Industries to calculate cost per tonne ? gures for prospective customers. Patania II uses jet water pumps to Oil States’
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March 2024 - Marine Technology Reporter page: 23elatively inactive since 2014, the Hunga Tonga–Hunga Ha‘apai (HT-HH) submarine volcano began erupting on December 20, 2021, reaching peak intensity on January 15, 2022. This triggered tsunamis throughout the Pa- R ci? c, destroyed lives and infrastructure, and generated the largest explosion recorded
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March 2024 - Marine Technology Reporter page: 18are also weaknesses in terms of accuracy because of FiGS Operations and Bene? ts signal noise and the ability to detect small ? eld gradients. In Conventional approaches to evaluating cathodic protection this process there is a risk that possible issues like coating (CP) systems offer only a momentary
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