Schlumberger

Case Study: Openhole Whipstock with One-Trip Mill Isolates Fish in a Single Trip to Re-Enter and Drill Ahead

Setting the whipstock below the casing shoe saves 70° angle in Eagle Ford and an extra trip

Challenge: Set the whipstock below the casing shoe, perform an openhole sidetrack, and isolate a section where fish was left in hole to allow directional drilling assemblies to drill ahead.

Solution: Use TrackMaster OH openhole whipstock sidetracking system and a short FasTrack one-trip mill to save the previously drilled angles, avoid sidetracking from the 7-in casing, and eliminate extra trips.

Result:

  • Set the Whipstock at 12,380 ft in an uneven wellbore.
  • Removed 141 ft of cement slurry.
  • Drilled 11 ft of rathole, providing re-entry for the drilling assembly.
  • Saved rig time by avoiding an extra trip in hole.

Isolate section with fish in hole

After drilling 25 ft below the casing shoe and building the curve section on a well in the Eagle Ford shale, the BHA became lost in hole, and Penn Virginia Corporation (PVA) could not fish it out. To save the previously built angle and avoid sidetracking from the 7-in casing, PVA needed to set the whipstock inside the open hole and pump cement, which would isolate the section where the fish was left in hole. The well was projected to reach TD at 18,000 ft, and the top of the fish was at 12,408 ft with a 70° inclination.

Pump cement through nozzles in mill

The TrackMaster OH openhole whipstock sidetracking system with a FasTrack one-trip mill was chosen for the operation with the spacer sub removed to shorten the system. The whipstock system was oriented to the high side of the well at 44° azimuth and set at 12,380 ft, 4 ft below the casing shoe and inside the 25-ft openhole section. The remaining section and the fish were isolated by pumping cement through the nozzles in the mill.

Enabled well re-entry in one trip

The TrackMaster OH system was successfully oriented to the high side of the well at 44° azimuth and set 4 ft below the 7-in casing shoe and inside the 25-ft openhole sections. Pumping cement using FasTrack mill properly isolated the required section with the fish.

During the operation, 141 ft of cement slurry was removed, and 11 ft of rathole was drilled in a single trip, allowing the drilling assembly trouble-free re-entry to the well. The elimination of an extra trip in hole saved rig time for the operator.


Download: Openhole Whipstock with One-Trip Mill Isolates Fish in a Single Trip to Re-Enter and Drill Ahead (0.15 MB PDF)

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