Schlumberger

Case Study: TrackMaster OH Whipstock System Sets New GOM Openhole Sidetrack Record at 31,513 ft

Sidetracking in mature, complex, deepwater field enables directional drilling assemblies to reach planned target

Challenge: Deploy an openhole whipstock system at more than 31,500-ft MD in Gulf of Mexico (GOM) to enable directional drilling assemblies to drill to the planned target.

Solution: Run the 9 5⁄8-in TrackMaster OH openhole whipstock sidetracking system to provide an endpoint for the existing wellbore and a stable platform to initiate wellbore

Result:

  • Drilled a clean 81/2-in sidetrack.
  • Enabled directional drilling assemblies to drill ahead to the planned target.
  • Set a new record of the deepest openhole whipstock in the Gulf of Mexico at 31,513 ft.

Perform openhole sidetrack in large, complex field in
34° pilot hole

An operator was drilling in the Keathley Canyon offshore Louisiana, US, in more than 6,000 ft of water. The field is a 20-year-old, deepwater oil, gas, and condensate field with multiple layers and complex faults. When kicking off from a cement plug was unsuccessful, a sidetracking alternative was needed to perform the 81/2-in openhole sidetrack in the 34° pilot hole at more than 31,500 ft. This alternative would enable directional drilling assemblies to drill ahead to the planned target where the whipstock was set.

Drill to TD with TrackMaster OH system

The TrackMaster OH openhole whipstock sidetracking system was chosen to provide an endpoint for the existing wellbore and a stable platform to initiate the wellbore departure. A 9 5⁄8-in TrackMaster OH system was deployed and set with a hydraulic anchor at 31,534-ft MD in one run. Using a Rhino XS hydraulically expandable reamer, the anchoring location had been enlarged while drilling, cemented, and redrilled as part of the earlier cement plug sidetracking attempt.

The WhipSim whipstock simulation software, i-DRILL integrated dynamic system analysis service, and automated BHA profile programs were used to predict the departure path. This would ensure that the drilling assembly could drill past the whipstock to build the required separation from the original borehole. An angle-building drilling assembly was used to drill across the whipstock and establish the rathole. Then RSSs were tripped past the whipstock and drilled to TD.

Set new record for deepest GOM openhole whipstock

The TrackMaster OH system provided a clean 81/2-in sidetrack, allowing subsequent directional drilling assemblies to regain the lost hole by drilling ahead to the planned target according to the revised directional drilling plan. This operation set a new world record for the deepest GOM openhole whipstock at 31,513 feet.


Download: TrackMaster OH Whipstock System Sets New GOM Openhole Sidetrack Record at 31,513 ft (0.95 MB PDF)

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TrackMaster OH
Openhole Whipstock Sidetracking System

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The TrackMaster OH openhole whipstock system provides application-specific, one-trip sidetrack reliability and cost optimization for sidetracking around obstacles downhole.
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