Case History: HydroPull™
Eliminate Use of Friction-Reducing Beads in the Marcellus Shale
These jobs required milling bridge plugs in 5000 to 6000 ft (1524 to 1829 m) horizontal 5.5-in. (140-mm) casing to 11,700 to 12,000 ft (3566 to 3658 m) MD. Prior to this work, the operator had been specifying friction-reducing beads and chemicals. The wells are inclined up to 95° with some heavy sand accumulations. Thirty-one composite bridge plugs were milled using the HydroPull™ tool, and 37 were milled without the HydroPull™ tool using beads and chemicals. The 2.88-in. (73-mm) HydroPull™ tool was operated on 2-in. (51-mm) tapered coil with a motor and mill using water at 2.5 bpm (397 lpm). In the toe of the well, the average plug milling time was reduced from 147 to 36 minutes, a factor of 4. In the heel, the plug milling time was cut in half.