In a shortened open-water season, Shell managed to drill just the top portions of two wells off the Arctic coast of Alaska. It had originally planned as many as six exploration wells.

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Shell completed its drilling season off the Arctic coast of Alaska Wednesday, falling short of its original goal of drilling as many as six exploration wells.

The company said it drilled the top portions of two wells without attempting to penetrate deeper reservoirs that could hold oil. The company said that the work would “go a long way in positioning Shell for another successful drilling program in 2013.”

Each well was drilled to a depth of 1,400 feet.

For months in the run-up to drilling, the company’s exploration plans aroused opposition from environmental groups and many Native Americans in Alaska, but the Obama administration nonetheless issued the drilling permits the company needed to begin work.

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Alaska’s open-water season is limited to about four months. And though ice receded in the Arctic region overall, it lasted longer than anticipated in the area of the Chukchi Sea where Shell was planning to drill. Even after getting its final permit, Shell had to wait while a huge ice sheet passed by.

Shell’s season ended up being even shorter because of delays in retrofitting a spill containment barge so that it would pass Coast Guard inspection. Shell’s oil spill containment dome was later damaged during sea trials.

When time became too short to complete an oil exploration well before the end of the open water season, the Interior Department gave Shell permission to drill the tops of its planned wells and to set in place blowout preventers. Interior said that there was not enough time for Shell to try to drill down to reservoirs that the company hopes contain oil and natural gas.

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