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Repsol Q2 Pad Gas and Mud Release

Unified Command

Whenever there is an incident involving more than one agency with jurisdiction, a joint command arrangement, called the Unified Command, is implemented. The Unified Command for the Repsol Q2 Pad Gas and Mud Release consists of the U.S. Environmental Protection Agency, the Alaska Department of Environmental Conservation, Repsol E&P USA, and the North Slope Borough.

Incident Description

Repsol contractor Nabors Drilling was drilling an exploratory well when the drill penetrated a shallow gas pocket at a depth of 2,523 feet, resulting in a gas kick. The gas kick drove drilling mud out of the well and through the gas diverter onto the ice pad and adjacent snow-covered tundra. The gas diverter is a pipe that extends approximately 75 feet from the drilling rig toward the south edge of the pad. Additional mud was pumped into the well in an attempt to control it, but that mud was also forced out by the gas.

  • Spill No. 12399904601

Incident Update

April 10, 2012 (final update)

  • Spill responders from Alaska Clean Seas (ACS), Penco and CCI used heavy equipment, such as loaders, excavators, trimmers, skid-steers, hydraulic hammers and snow machines with trailers, to remove the spill material from the heaviest contaminated zones. Hand tools were used to recover drilling mud from the areas of lightest contamination. Cleanup crews removed approximately 6,286 cubic yards of spilled material from the snow-covered tundra. In addition, 2,402 cubic yards of down-hole material and 116,928 gallons of water-based mud and freshwater from the steam units were recovered from the drilling pad during the initial response.
  • Repsol hired a surveying contractor to assist in calculating the off-pad impacted area and the volume of the material released to the tundra. The contractor estimated that 21,114 bbls of down-hole material were released to the tundra during the initial blow-out. In addition, they calculated the total impacted area as 23.75 acres. An area of 16.76 acres of lightly-misted material was determined to be unrecoverable, and no cleanup occurred in this zone.
  • On April 1, 2012, a group from the Kuukpikmiut Subsistence Oversight Panel, Inc. (KSOP) and from the village of Nuiqsut visited the site to see how the cleanup had progressed. The group was satisfied with the work that had been done and said that they did not believe that any further cleanup needed to be performed.
  • On April 5, 2012, the final site inspection team, composed of representatives from the North Slope Borough, KSOP, ADEC, ADNR and Repsol, made the final site inspection. The team agreed that no further cleanup actions were required. ADEC's field monitors were demobilized from the site on April 6, 2012.
  • Full Chronology
  • Final Situation Report

Response Plans, Maps and Related Information


Environmental Sensitivity Index (ESI) Maps


  • Click thumbnail for larger view

Technical Information

Oil Cleanup on the Tundra


NWS Public Weather Forecasts

  • North Slope (Central Beaufort Sea Coast including Nuiqsut, Prudhoe Bay, Alpine, Deadhorse, Kuparuk)


Images may be downloaded for free and used in publications provided credit is given to the source.

February 17, 2012

February 22, 2012

February 23-26, 2012

February 24-27, 2012

March 1, 2012

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