NOW READ OUR ARTICLES IN 40 DIFFERENT LANGUAGES.
HOME PAGE SUBSCRIPTIONS, Print Editions, Newsletter PRODUCTS READ THE PETROLEUM NEWS ARCHIVE! ADVERTISING INFORMATION EVENTS PETROLEUM NEWS BAKKEN MINING NEWS

SEARCH our ARCHIVE of over 14,000 articles
Vol. 18, No. 1 Week of January 06, 2013
Providing coverage of Alaska and northern Canada's oil and gas industry

Stuck but intact

Salvage team inspects Shell rig aground on shore of Sitkalidak Island

By Alan Bailey

Petroleum News

The Kulluk, Shell’s floating drilling platform, aground on the shore of Sitkalidak Island to the southeast of Kodiak Island, appears to be intact and stable, according to the team responding to the grounding incident. A five-member team of salvage experts visited the vessel for about three hours on Jan. 2. And a helicopter overflight of the grounding site on the same day spotted three of the Kulluk’s lifeboats near the stricken vessel, but no signs of any debris.

Shell has chartered Smit Salvage to head the salvage operation for the Kulluk. Shell presumably hopes to recover the vessel relatively intact, but at this stage the response team is unwilling to speculate on the means, timing and outcome of recovering the vessel.

However, an emergency towing system was placed on the Kulluk during the Jan. 2 inspection, U.S. Coast Guard Capt. Paul Mehler, the federal on-scene coordinator for the Kulluk response, explained during a press conference on the evening of Jan. 2.

“The plans for the Kulluk, once we’ve recovered it, will depend very much on the state of the vessel,” said Sean Churchfield, Shell’s incident commander.

On beach

Steve Russell, the state on-scene coordinator, said that the Kulluk had run aground in water off a cobble beach with mixed sand and gravel. The beach is at the base of a 200-foot bluff.

Apparently the Kulluk was carrying 143,000 gallons of ultra-low sulfur diesel and roughly 12,000 gallons of other petroleum products, with much of the fuel acting as ballast, to stabilize the vessel in the sea. The fuel tanks are in the interior of the vessel, isolated from the vessel’s hull.

“I am encouraged by what we saw today and we are awaiting the salvage team’s assessment, to finalize plans to remove the potential for any (fuel) release,” Mehler said.

During a Jan. 1 press conference Russell said that the prime landowner in the area of the grounding is the Old Harbor village Native corporation. DEC says that three species listed under the Endangered Species Act may be present in the area, while wildlife known to frequent the area includes harbor seals.

Meantime, the chronicle of events leading to the grounding has emerged from a sequence of press releases, press conferences and statements to the media.

Maintenance needed

Having demobilized the Kulluk from its 2012 drilling operations in the Beaufort Sea, Shell decided to move the drilling vessel from Dutch Harbor in the Aleutian Islands to the Seattle area of the U.S. West Coast for maintenance work, in preparation for a continuation of Arctic drilling in the summer of 2013. And, with the vessel not being self-propelled, Shell’s new anchor-handling vessel, the Aiviq, would tow the vessel for the three- to four-week voyage south. The Aiviq, launched early in 2012, has four engines, with a combined power of 21,776 horsepower. The Kulluk was equipped with one main towline, and a second emergency towline for use should the first line fail.

It was necessary to tow the Kulluk to the West Coast for maintenance, Shell spokesman Curtis Smith has told Petroleum News. Dutch Harbor is not a working shipyard and it would have been too logistically difficult to move the maintenance crew and materials to the Aleutian Islands port, Smith said.

Departed Dec. 21

The Aiviq and the Kulluk set out from Dutch Harbor on Dec. 21, following a weather-guided route that approximately paralleled the coastline. During a Jan. 1 press conference Churchfield said that the routing of the tow and the decision to depart Dutch Harbor relied on the weather forecasts at the time, with Shell setting a departure window but giving the Aiviq’s master discretion on when to leave. Once en route, the two vessels would travel at about four knots, Churchfield said.

Churchfield said that the U.S. Coast Guard had inspected the Kulluk in Dutch Harbor and that the tow company, warrantee surveyors and others had approved the tow plan.

Smith told Petroleum News that at the time of departure the weather forecast indicated a “favorable two-week window.”

“Our towing plan and the choice of the Aiviq had been positively reviewed by the Coast Guard,” Smith said.

But predicting the weather more than a few days ahead is notoriously difficult. By Christmas Day a winter storm was in the forecast for the seas to the south of Kodiak, in the area that by then the Aiviq and Kulluk were beginning to traverse.

Hawser parted

Trouble started on Thursday, Dec. 27, when the towing hawser between the two vessels parted. Shell has not at this stage provided any insights into why the line broke — the company says that a diagnosis of the reason for the breakage will form part of a subsequent investigation into the Kulluk incident.

“The Aiviq has (previously) towed the Kulluk on a single towline for more than 4,000 miles, including in conditions similar to what we are seeing now in the Gulf of Alaska,” Smith told Petroleum News Jan.2.

Engine failure

The initial problems with the towline escalated in the early hours of Dec. 28, at which time all four engines on the Aiviq failed when the Aiviq and the Kulluk were about 50 miles south of Kodiak. The engine failure appears to have resulted from fuel contamination, although that has yet to be confirmed. At about 8 a.m. the crew of the Aiviq succeeded in restoring power to one of the vessel’s engines, thus enabling the use of thrusters to maintain position.

Meantime, with the wind blowing at 40 mph, and with 35-foot seas and worsening sea conditions, the U.S. Coast Guard had dispatched the cutter Alex Haley to the scene to provide assistance. The Alex Haley succeeded in establishing a tandem tow with the Aiviq and the Kulluk. But at about 6:30 a.m. the towline parted and became tangled in the cutter’s port propeller, the Coast Guard said. The cutter subsequently returned to Kodiak for repairs.

The Coast Guard dispatched the cutter Hickory from Homer and the cutter Spar from Kodiak.

Vessels deployed

Following the engine failure in the Aiviq, Shell started deploying vessels from its drilling fleet — the Guardsman, a support vessel, set out from Seward, while Shell’s oil spill response vessel, the Nanuq, also headed out.

The Guardsman arrived on scene south of Kodiak in the afternoon of Dec. 28 and succeeded in securing a towline to the Aiviq. In the evening, concerned about the safety of the 18 crew members on the Kulluk, Shell asked the Coast Guard to evacuate the crew. Early the following morning, the unified command authorized the Kulluk’s crew to drop its anchors off the coast of Kodiak, in an attempt to slow the drift of the vessel.

At 5:30 a.m. on Saturday, Dec. 29, the crew of the Guardsman reported that the towline from the Guardsman to the Aiviq had failed. But at 6:30 a.m. the Nanuq arrived and successfully connected a second towline.

Also on the Saturday morning, Coast Guard Jayhawk helicopters from Kodiak delivered engine parts to the Aiviq, to enable the Aiviq’s engines to be repaired. At 9:30 a.m. the Aiviq’s crew managed to restart a second engine.

Crew evacuated

Later in the day, the Coast Guard announced that it had succeeded in evacuating all of the Kulluk’s crew by helicopter and that all four of the Aiviq’s engines were running again.

The Alaska Department of Environmental Conservation and a representative from the Kodiak Borough joined the unified command for the response to the incident.

During the morning of Sunday Dec. 30, with the severe weather continuing, the Kulluk remained under tow by the Aiviq and the Nanuq, by then about 20 miles south of Kodiak Island. Shell had also commissioned the tug Alert to join the response effort. The Alert, based in Valdez as part of Alyeska Pipeline Service Co.’s support fleet for the marine terminal at the southern end of the trans-Alaska oil pipeline, arrived on scene on the Sunday afternoon.

Adrift again

But by 4:30 p.m. on that same day the towlines between the Kulluk and the Aiviq and the Nanuq had separated, leaving the Kulluk adrift again. At about 12:45 a.m. on Monday, Dec. 31, the Alert was able to attach to the 400-foot line that had become detached from the Aiviq. The Aiviq subsequently reconnected to the drilling rig. And, with the weather improving somewhat, there appeared to be an opportunity to better secure the rig before the next storm moved in.

“The sea state is actually significantly diminished but we anticipate that it’s going to build up again pretty quickly into a severe state,” Smith told Petroleum News at 9:30 a.m. on Dec. 31. “Right now unified command is considering options to further secure the vessel. That includes potentially new towlines, just for redundancy, and/or safe harbor further to the north.”

The Coast Guard briefly deployed technicians to the Kulluk to check the condition of the towlines on the vessel. But winds in excess of 60 mph were forecast for the evening.

Grounded

At 4:30 p.m. the Aiviq lost its tow to the Kulluk. In the interests of safety, the towline from the Alert was released at 8:10 p.m. and before long the Kulluk drifted aground on the shore between the north end of Ocean Bay and Partition Cove on Sitkalidak Island.

As responsible party, Shell has said that it will pay for the cost of the response to the Kulluk incident, including costs incurred by the Coast Guard and the State of Alaska. Three people have been injured during the incident, but these injuries were minor in nature, Mehler said on Jan. 1.



Did you find this article interesting?
Tweet it
TwitThis
Digg it
Digg
Print this story | Email it to an associate.

Click here to subscribe to Petroleum News for as low as $69 per year.


Petroleum News - Phone: 1-907 522-9469 - Fax: 1-907 522-9583
circulation@PetroleumNews.com --- http://www.petroleumnews.com ---
S U B S C R I B E

Copyright Petroleum Newspapers of Alaska, LLC (Petroleum News)(PNA)©2013 All rights reserved. The content of this article and web site may not be copied, replaced, distributed, published, displayed or transferred in any form or by any means except with the prior written permission of Petroleum Newspapers of Alaska, LLC (Petroleum News)(PNA). Copyright infringement is a violation of federal law subject to criminal and civil penalties.




Drillship to be towed to U.S. West Coast after propulsion problem

Because of a problem with its propulsion systems, the Noble Discoverer, the drillship that Shell is using for exploratory drilling in the Chukchi Sea, will be towed to the U.S. West Coast for maintenance and repairs, U.S. Coast Guard spokesman Kip Wadlow told Petroleum news Dec. 28.

Shell spokesman Curtis Smith has confirmed the plan to tow the Noble Discoverer south but told Petroleum News on Jan. 3 that the vessel was still in the Alaska port of Seward, waiting for the necessary support vessels for the tow.

The drillship transited to Seward on the Kenai Peninsula after the end of this year’s Arctic drilling season, but the vessel’s crew experienced a problem with the propulsion system while preparing to moor in the port, Wadlow said. And, not having been able to have the system fixed, the vessel will be towed to a port in the Pacific Northwest.

Other issues

Coast Guard inspectors, called to investigate the propulsion problem also spotted some other problems with the vessel, Wadlow said.

“While our inspectors were on board the ship they did notice some serious issues regarding some of the systems for crew safety and also for pollution prevention equipment,” Wadlow said.

Capt. Paul Mehler, the officer in charge of marine inspections in western Alaska, issued an order requiring the vessel to remain in port until the deficiencies were corrected. On Dec. 19, after the completion of necessary repairs to the vessel, the Coast Guard removed the detention order. But those repairs did not include repairs to the propulsion system, so that the ship was not able to embark for the south, Wadlow said.

Noble Corp., owner and operator of the Noble Discoverer, issued a Dec. 27 press release, confirming that the Coast Guard had found some deficiencies in the ship but commenting that the company had also reported some other potential regulatory non-compliance issues that it had discovered, including the possible unauthorized discharge of collected water outside the period of drilling operations.

Being resolved

“Noble has already resolved a number of the issues with the Noble Discover identified by the Coast guard and plans to complete the remaining items during the previously scheduled shipyard stay in Washington,” Noble said. “Noble continues to cooperate with the Coast Guard’s ongoing review, as well as conducting its own investigation and a review of its marine management processes and procedures.”

Noble said that it and Shell, in coordination with the Coast Guard, are reviewing the drillship’s operations in Alaska in 2012, to further strengthen the readiness of the drillship and other assets for the 2013 drilling season.

—ALAN BAILEY