Schlumberger

Case Study: Successful Sidetrack on First Attempt with Additional 500 ft of Original Borehole Saved

TrackMaster OH system provides positive control of kickoff depth and direction without cement plug

Challenge: Minimize loss of the original openhole section when sidetracking.

Solution: TrackMaster OH openhole whipstock and sidetracking system eliminates the need to kick off with a cement plug.

Result: Saved about 500 ft of original borehole that would have been lost to cement, together with significant amounts of time and money.

Sidetrack required with minimum loss of open hole

While drilling Cretaceous/Jurassic formations southwest of Villahermosa, Mexico, an operator experienced unexpected borehole problems. A sidetrack was required but the amount of open hole lost, as well as operational costs, needed to be minimized.

Cement plug eliminated by TrackMaster OH system

TrackMaster OH openhole whipstock and sidetracking system was selected for the task. By providing a positive means of controlling the kickoff depth and orientation with a hydraulically set expandable anchor and the 3° steel ramp of the whipstock, the system eliminates the traditional need to kick off with a cement plug. For this well, the TrackMaster OH system deployed the anchor at a record depth of 5,919 m [19,411 ft] and set the whipstock without incident.

Loss of original borehole minimized

Eliminating the cement plug—usually about 500 ft long—brought the kickoff point correspondingly closer to the unusable zone, preserving the section of open hole that would otherwise have been lost to cement. Sidetracking was successful on the first attempt, saving the operator expensive repeat attempts which are often required when trying to kick off with a cement plug, as well as the rig time that would have been spent waiting for the cement to dry and time-drilling through the cement.


Download: Successful Sidetrack on First Attempt with Additional 500 ft of Original Borehole Saved (0.67 MB PDF)

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