Apache Corporation Mr. Dennis Bickford Pierce Estates #B-148 Magnet Whithers Field Wharton County, TX Product Application CASE HISTORY Problem Depth: 7,954’ MD Hole Size: 12-1/4” Mud Vendor: Ambar Lonestar Mud Wt: 13.0 ppg DrillChem Engineer: Mel Melder/ Barry Broussard Mud Type: Water Base Problem: While drilling the 12-1/4” hole section heaving shale was observed to be coming over

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