Division of Spill Prevention and Response

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Eni Rock Flour #2 Drilling Mud Spill



Incident Description
Location Rock Flour Well #2. The Rock Flour Prospect is located approximately 4 miles south of the Milne Point Road and Spine Road intersection, west of Prudhoe Bay, Alaska.
Product/Quantity

Eni estimates 3,150 gallons (75 barrels) of water-based drilling mud. These fluids are from the upper portion of the well that was above any oil-bearing formation. As a result, no oil is present in the fluids.

Cause The spilled fluids were placed in an ice-bermed storage area where the drilling mud would freeze and later be hauled to the grind and inject facility at Prudhoe Bay for disposal. Although the ambient air temperature was about -40°F, the fluids were sufficiently warm to melt through the ice sidewall and spill onto the snow covered tundra adjacent to the ice pad.
Time/Date of Incident Eni Petroleum discovered the spill at 11:30 AM, January 4, 2007, and reported the spill to ADEC at 12:00 PM, January 4, 2007.
Situation Reports
01/05/2007 (PDF 610K)

01/08/2007 (PDF26K)

04/13/2007 (PDF 37K) -- FINALupdated
Photos
View of spill shortly after it occurred on 1/4/07.
Drilling mud being removed from tundra surface.
View of spill shortly after it occurred on 1/4/07.
Drilling mud removed from tundra surface. (01/07/2007)    

Excavator working from on top of the containment cell.
Drilling mud removed from tundra surface.
Drilling mud removed from tundra surface.
Excavator working from on top of the containment cell. (01/07/2007)
Drilling mud removed from tundra surface. (01/07/2007)
Drilling mud removed from tundra surface. (01/07/2007)

Removing drilling mud from tundra with a shovel. 1/8/2007
Removing drilling mud from tundra with a shovel. 1/8/2007
Removing Drilling Mud from the Tundra with a Shovel. 1/8/2007
Removing drilling mud with the excavator. 1/9/2007
For more information

Amanda Stark 451-2175