Shell begins preliminary exploratory drilling work in Chukchi Sea off northwest Alaska coast
ANCHORAGE, Alaska — More than four years after Royal Dutch Shell paid $2.8 billion to the federal government for petroleum leases in the Chukchi Sea, a company vessel on Sunday morning sent a drill bit into the ocean floor, beginning preliminary work on an exploratory well 70 miles (113 kilometres) off the northwest coast of Alaska.
Drilling started at 4:30 a.m., said Shell Alaska spokesman Curtis Smith. Shell Alaska vice-president Pete Slaiby called it historic.
Federal officials estimate Arctic waters in the Chukchi and Beaufort seas hold 26 billion barrels of recoverable oil and 130 trillion cubic feet (3.68 trillion cubic meters) of natural gas. Interior Secretary Ken Salazar announced Aug. 30 that Shell would be permitted to begin preparation work at the Chukchi site even though the company’s spill response barge has not been certified and is not positioned nearby.
The company is authorized to drill narrow pilot holes 1,400 feet (420 metres) below the ocean floor and roughly 4,000 feet (1,200 metres) above a petroleum reservoir.
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. Despite the requirement to stay out of oil-bearing rock, they were elated to finally begin work.
“In the days to come, drilling will continue in the Chukchi Sea, and we will prepare for drilling to commence in the Beaufort Sea,” Slaiby said.
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 bears and walruses.
Shell officials say there’s little chance of that happening. They are drilling in about 130 feet (390 metres) deep, versus 5,000 feet (1,500 metres) at the site of the Gulf spill, and wellhead pressure is expected to be far less. Shell also claims its support vessels could quickly choke off and respond to a spill.
Smith said workers Friday completed mooring of the drill ship, the Noble Discoverer, in heavy seas with eight anchors that each weigh 15 tons and are staged on the seafloor in a circular pattern. The diameter of the anchor pattern, he said by email, was more than 6,500 feet (1,950 metres).
A 20-by-40-by-40-foot (6-by-12-by-12-meter) mud-line cellar will allow a blowout preventer to be positioned below the seafloor, protecting it from ice scraping the bottom.
The oil spill response barge remains in Bellingham, Washington state, and is expected to undergo sea trials over the weekend, he said.
Shell’s other Arctic Ocean drill ship, the Kulluk, is in the Beaufort Sea waiting for the fall whale hunt to end before moving to the drill site.