ANCHORAGE, Alaska — Royal Dutch Shell on Monday was moving its drill ship off a prospect in the Chukchi Sea, a day after drilling began 70 miles off the Alaska coast because sea ice was moving toward the vessel.
Shell Alaska spokesman Curtis Smith tells The Associated Press that drilling was stopped for safety reasons.
"As a precautionary measure and in accordance with our approved Chukchi Sea Ice Management Plan, Shell has made the decision to temporarily move off the Burger-A well to avoid potentially encroaching sea ice," he said by email. "Once the ice moves on, the Noble Discoverer will re-connect to anchors and continue drilling."
Shell officials on Sunday were monitoring ice measuring 30 miles long and 12 miles wide about 105 miles away from the drill ship, Smith said by phone.
"We're using satellite images, we're using radar images, we're also using onsite reconnaissance to watch this ice so there are no surprises," Smith said.
The ice varies in thickness, he said, but at its thickest is 25 meters, or about 82 feet. It was moving at 0.5 knots, or less than 1 mph.
The decision to halt drilling was made Sunday. At noon Monday, the drill ship was detaching from the last of eight massive anchors. Smith said he did not know how far away the ice was at that time.
The anchors will stay in place.
"Part of working in ice is having the ability to temporarily relocate," Smith said. "You never want to stop operations when your crews and your equipment are working smoothly but this is what it means to work safely in the Arctic."
Drilling may be delayed by two days or more, he said. The ice, he said, is dynamic. After it passes, changing winds could blow it back.
"We need as much margin once it moves by as we demand before we start drilling," he said.
Drilling had begun at 4:30 a.m. Sunday. Royal Dutch Shell PLC was given permission last month to begin preliminary work on an exploratory well. The company's oil spill response barge has not been certified but the company was authorized to drill pilot holes that do not descend into oil reservoirs.
Shell has spent upward of $4.5 billion for Arctic Ocean drilling but had been thwarted from drilling by environmental lawsuits, regulatory requirements and short open-water drilling seasons.
Shell Alaska vice president Pete Slaiby on Sunday called the beginning of drilling historic. He said it was the first time a drill bit had touched the sea floor in the U.S. Chukchi Sea in more than two decades.
Drilling is bitterly opposed by environmental groups that say oil companies have not demonstrated they can clean up a spill in ice-choked water. They say a spill of the magnitude of the Deepwater Horizon blowout in the Gulf of Mexico would be catastrophic in a region hammered by climate warming and home to endangered or threatened marine mammals such as bowhead whales, polar bear and walrus.
___
Online:
http://www.shell.us/alaska
Also on HuffPost:
Loading Slideshow
Niger Delta ExxonMobil Spill, Nigeria - May 2010
In Nigeria's Akwa Ibom State, an ExxonMobil pipeline ruptured on May 1 and spilled over a million gallons of oil, <a href="http://www.guardian.co.uk/world/2010/may/30/oil-spills-nigeria-niger-delta-shell" target="_hplink">reported the <em>Guardian</em></a>. The leak continued for seven days before it was stopped.
<a href="http://www.huffingtonpost.com/omoyele-sowore/the-oil-spill-no-ones-tal_b_649220.html" target="_hplink">HuffPost blogger Omoyele Sowore explained</a> in July 2010 that an oil spill from ExxonMobil operations was nothing new to the country. He wrote that an "environmental catastrophe [had] been going on since December 2009." He described the toll on Nigeria: "There's oil on the surface of the ocean, wildlife coated in crude, fishermen losing their businesses."
Trans-Alaska Pipeline Spill - May 2010
In May 2010, several thousand barrels of oil spilled from the Trans-Alaska pipeline "during a scheduled pipeline shutdown at a pump station near Fort Greely," <a href="http://www.huffingtonpost.com/2010/05/26/alaska-oil-spill-trans-al_n_589974.html" target="_hplink">explained AP</a>.
No injuries were reported and officials said the spill was likely "limited to the gravel on top of the containment area's line."
Red Butte Creek Spill, Utah - June 2010
In June 2010, a Chevron pipeline ruptured and spilled oil into a creek near Salt Lake City, Utah.
It was first estimated that over 400 to 500 barrels spilled into the creek, which leads into the Great Salt Lake, <a href="http://www.huffingtonpost.com/2010/06/12/utah-oil-spill-500-gallon_n_610232.html#s99698" target="_hplink">reported AP</a>. Around 150 birds were "identified for rehabilitation." The <a href="http://www.huffingtonpost.com/2010/06/14/utah-oil-spill-officials-_n_611014.html" target="_hplink">oil did not reach the Great Salt Lake</a>, however.
<a href="http://www.huffingtonpost.com/2010/07/14/chevron-cited-for-oil-spi_n_646340.html" target="_hplink">Chevron was later cited for the spill</a>, which released an estimated 33,000 gallons in total.
In March 2012, <a href="http://www.huffingtonpost.com/huff-wires/20120324/us-oil-spill-utah/" target="_hplink">a group of 66 residents of a Salt Lake City neighborhood sued Chevron</a> for damage caused by the Red Butte Creek spill and a smaller spill in December 2011.
Kalamazoo River Spill, Michigan - July 2010
In late July 2010, an Enbridge pipeline in southwestern Michigan sprung a leak and <a href="http://www.huffingtonpost.com/2010/07/27/michigan-oil-spill-among_n_661196.html" target="_hplink">spilled over 800,000 gallons of oil into a creek</a> which flows into the Kalamazoo River.
By August, a regional EPA administrator said that significant progress had been made at the site, but "the agency cautioned that it will take months to complete the cleanup," <a href="http://www.huffingtonpost.com/2010/08/02/michigan-oil-spill-epa-of_n_667556.html" target="_hplink">reported AP</a>.
By the end of September, <a href="http://www.huffingtonpost.com/2010/09/27/michigan-oil-pipeline-res_n_741233.html" target="_hplink">the pipeline -- which travels from Ontario to Indiana -- was back in operation</a>.
The EPA later <a href="http://www.huffingtonpost.com/huff-wires/20111116/us-michigan-river-oil-spill/" target="_hplink">reported that about 1.1 million gallons of oil were recovered</a>, but pipeline operator Enbridge said that it would stick with previous estimates that only about 843,000 gallons were spilled.
Xingag Harbor Spill, Dailan, China - July 2010
In July 2010, China experienced what was reported as the "<a href="http://www.huffingtonpost.com/2010/07/21/china-oil-spill-grows-off_n_653852.html#s120708" target="_hplink">country's largest reported oil spill</a>" after a pipeline rupture near the northeastern port city of Dailan.
Several days after the spill, cleanup efforts were underway over a 165 square mile (430 square kilometer) area of the Yellow Sea.
The Chinese government reported that about 1,500 tons or 461,790 gallons of oil had spilled, but <a href="http://www.huffingtonpost.com/2010/07/30/china-oil-spill-far-bigge_n_665038.html#s120708" target="_hplink">experts contended that the spill could have been "dozens of times larger,"</a> reported AP.
Peace River Spill, Alberta, Canada - April 2011
In late April 2011, a pipeline in northwestern Alberta began leaking, and created the worst spill in the province in 36 years, <a href="http://www.calgaryherald.com/news/alberta/Rainbow+pipeline+leak+largest+years/4720888/story.html" target="_hplink">reported the <em>Calgary Herald</em></a>.
About 28,000 barrels of oil were reportedly spilled from the Rainbow pipeline, which is operated by Plains Midstream Canada.
The <em>Globe and Mail</em> revealed that the pipeline operators "<a href="http://www.theglobeandmail.com/report-on-business/oil-on-rainbow-line-halted-8-hours-after-problem-detected/article2013335/" target="_hplink">detected a potential problem nearly eight hours before halting the flow of crude</a>." A nearby school in a First Nation community was closed after residents reported "nausea, burning eyes and other symptoms," and several animals were found dead.
In late July, Plains Midstream <a href="http://www.huffingtonpost.ca/2011/07/28/alberta-pipeline-owner-as_n_912796.html" target="_hplink">requested to re-open the pipeline</a> and begin to ship oil to Edmonton again.
Bohai Bay Spill, China - June 2011
In June 2011, an oil <a href="http://www.huffingtonpost.com/2011/07/01/china-offshore-oil-spills-bohai-bay_n_888473.html" target="_hplink">spill occurred about 25 miles off the coast of China's Shandong province</a> in Bohai Bay. A second spill followed in July.
In late August, <a href="http://www.huffingtonpost.com/2011/08/26/new-seeps-in-china-spill_n_937809.html" target="_hplink">it was reported</a> that ConocoPhillips had discovered more oil seeps in Bohai Bay, although only "1 to 2 liters (a quarter to a half-gallon) of oil and drilling mud were being released each day."
The company reported that the 2011 spills released 700 barrels of oil and 2,500 barrels of drilling mud into the bay and that most of it was recovered. In September, <a href="http://www.huffingtonpost.com/2011/09/05/china-oil-spill-conocophillips_n_949745.html" target="_hplink">China's State Oceanic Administration claimed that oil was still seeping</a> underwater.
In early 2012, Texas-based ConocoPhillips <a href="http://www.huffingtonpost.com/huff-wires/20120124/as-china-oil-spill/" target="_hplink">reached a settlement deal with the Chinese government</a> for $160 million.
Yellowstone River Spill, Montana - July 2011
In July 2011, a pipeline beneath Montana's Yellowstone River ruptured and sent an oil plume 25 miles downstream, <a href="http://www.huffingtonpost.com/2011/07/02/yellowstone-oil-spill-pro_n_889363.html" target="_hplink">reported AP</a>.
Despite reassurances from ExxonMobil that the pipeline was safe, <a href="http://www.huffingtonpost.com/2011/07/06/yellowstone-river-oil-spill-exxon-mobil_n_891246.html" target="_hplink">the July spill released what was originally estimated to be 42,000 gallons of oil</a>. With other 1,000 workers assisting the cleanup, ExxonMobil <a href="http://www.huffingtonpost.com/2011/11/04/yellowstone-river-cleanup-costs_n_1077106.html" target="_hplink">estimated that it would cost $135 million to clean the river</a>.
In January 2012, <a href="http://www.huffingtonpost.com/2012/01/19/exxon-yellowstone-oil-spill_n_1216830.html" target="_hplink">it was reported</a> that ExxonMobil had increased its estimate of the spill size by 500 barrels. AP later <a href="http://www.huffingtonpost.com/2012/04/06/yellowstone-river-spill-response-plan_n_1408328.html" target="_hplink">reported the estimated spill size as 63,000 gallons</a>.
<em><strong>CORRECTION:</strong> A previous version of this slide stated the estimated spill size as 63,000 barrels instead of gallons.</em>
North Sea Spill, United Kingdom - Aug. 2011
In August 2011, <a href="http://www.huffingtonpost.com/2011/08/15/north-sea-spill-uk-oil-spill_n_927078.html" target="_hplink">an oil rig off the eastern coast of Scotland began leaking</a> oil into the North Sea. Royal Dutch Shell, which operates the Gannet Alpha oil rig, initially reported that 54,600 gallons of oil were spilled.
A second leak soon occurred, turning the spill into the worst in the North Sea in a decade, <a href="http://www.huffingtonpost.com/2011/08/16/north-sea-oil-spill-shell_n_927941.html" target="_hplink">reported AP</a>.
Several days later, Shell announced that it had "closed a valve from which oil was spilling into the North Sea," <a href="http://www.huffingtonpost.com/2011/08/19/shell-says-it-has-closed-_n_931379.html" target="_hplink">according to AP</a>. The spill released about 1,300 barrels of oil, which spread out over a 2.5 square mile (6.7 square kilometer) area.
Campos Basin Spill, Rio de Janeiro, Brazil - Nov. 2011
In mid-November 2011, Brazilian authorities began investigating an offshore spill near Rio de Janeiro, <a href="http://www.huffingtonpost.com/2011/11/17/chevron-oil-spill-brazil_n_1100062.html" target="_hplink">reported AP</a>.
Chevron initially reported that between 400 and 650 barrels of oil had spilled into the Atlantic, while a nonprofit environmental group using satellite imagery estimated that the spill rate was at least 3,738 barrels per day.
Chevron soon claimed full responsibility for the spill. The brazilian division's COO said, Chevron "<a href="http://www.huffingtonpost.com/2011/11/20/brazil-oil-spill-chevron-_n_1104070.html" target="_hplink">takes full responsibility for this incident</a>," and that "any oil on the surface of the ocean is unacceptable to Chevron," reported AP.
In December, Brazilian prosecutors announced that they were <a href="http://www.huffingtonpost.com/2011/12/14/brazil-oil-spill-chevron-payment_n_1149554.html"target="_hplink">seeking $10.6 billion in damages</a> from Chevron for the spill that leaked nearly 3,000 barrels of oil.
In March 2012, a Brazilian federal judge <a href="http://www.huffingtonpost.com/2012/03/18/brazil-oil-spill-chevron_n_1355923.html" target="_hplink">allowed prosecutors to file criminal charges against Chevron and Transocean</a> and 17 executives from both companies were barred from leaving Brazil.
Rena Spill, New Zealand - Oct. 2011
In October 2011, a Liberian-flagged cargo ship ran aground on a reef in Northern New Zealand and began leaking oil.
With oil washing up on shore, a government minister deemed it <a href="http://www.huffingtonpost.com/2011/10/11/new-zealand-oil-spill_n_1004643.html" target="_hplink">the country's largest maritime environmental disaster</a> a week later.
Although over 2,000 sea birds were killed by the spill that spilled about 400 tons of fuel oil, <a href="http://www.huffingtonpost.com/2011/11/22/new-zealand-oil-spill-penguins_n_1107289.html" target="_hplink">343 little blue penguins were rescued and cleaned of oil</a>. <em>[<a href="http://www.huffingtonpost.com/2011/12/22/new-zealand-oil-spill-penguins-released_n_1151788.html" target="_hplink">Watch video of the penguins' release into the wild here.</a>]</em>
In January, <a href="http://www.huffingtonpost.com/2012/01/10/new-zealand-oil-spill-ship_n_1196568.html" target="_hplink">half of the stricken Rena began sinking</a> into the sea after breaking apart and spilling over 100 cargo containers.
Nigeria Oil Spill - Dec. 2011
The spill, which took place near the coast of Nigeria, was reported as "likely the worst to hit those waters in a decade," <a href="http://www.huffingtonpost.com/2011/12/22/shell-oil-spill-nigeria_n_1164891.html" target="_hplink">according to AP</a>.
After two days, the spill had affected 115 miles (185 kilometers) of Nigerian coastline.
Several days after the December 20 spill, <a href="http://www.huffingtonpost.com/2011/12/26/shell-nigeria-oil-spill_n_1170198.html" target="_hplink">Shell reported that the leak -- which occurred about 75 miles offshore -- had been contained before it reached the Nigerian coast</a>.
The spill, which covered 350 square miles of ocean at its peak, was reported as having released less than "40,000 barrels -- or 1.68 million gallons" of oil.
Also On The Huffington Post...
Loading comments… 
DAN JOLING 09/10/12 07:48 PM ET Associated Press