Only Two (2) New Permits; Slawson, BR, and Whiting Each With a Nice Well

Maybe a reader will know the answer to this question: 

Burlington Resources has a permit for another "Midnight Run" well in the Union Center oil field. There is a "new" abbreviation in the name: "ULW" ---

• #24537, loc, BR, Midnight Horse 11-1MBH-ULW

I'm curious if anyone knows what the designation "ULW" means. 

Thank you.

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New permits -- 

• Operators: BR, Slawson
• Fields: Union Center (McKenzie)
• Comments: Slawson has a permit for a wildcat in McKenzie County

Wells coming off the confidential list were reported earlier; see sidebar at the right

Producing wells completed:

• 22410, 212, Slawson, Ann Nelson (Federal) 3-31-30H, Ross, t10/12; cum 4K 9/12;
• 21398, 1,063, Slawson, Wolverine Federal 4-31-30TFH, Elm Tree, t9/12; cum 40K /12;
• 20823, 2,880, BR, Arches 44-35TFH, Keene, t6/12; cum 76K 9/12;
• 23580, 1,295, Whiting,  Iverson 41-14H, Sanish, t10/12; cum --