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A North Sea operator needed to set a whipstock in 7-in. casing on a well with a 14,993-ft (4,570-m) measured depth, a 8,776-ft (2,675-m) total vertical depth, and an inclination of 62.54°. There was no casing tally available, and the target depth for setting the whipstock was in between perforations.

The operator elected to run the xSight™ smart intervention casing collar locator (CCL) service to accurately locate and avoid casing collars while setting the whipstock and milling the window. Because of the xSight service’s ability to return real-time data, the operator decided to complete a cleanout drift run in the same trip, eliminating the need for a dedicated wireline run. In addition, having downhole feedback would enable the crew to manage losses where fluid would likely escape through the perforations above and below the target depth.

The bottomhole assembly (BHA) consisted of cleanout tools for the drift run, the xSight sensor unit for optimizing the cleanout operation and identifying downhole obstructions, the xSight density CCL, and xSight orientation capabilities that could be used to rotate through obstructions if needed. As the BHA was run in hole, realtime feedback from xSight services enabled the operator to closely monitor the well’s equivalent circulation density (ECD), helping the crew minimize fluid loss.

The BHA encountered a restriction at 14,944 ft (4,555 m). After looking at the data from xSight services, the decision was made to pull the BHA out of hole to prevent sticking in the wellbore. After careful inspection, marks on the scraper indicated it may have been preventing the BHA from getting past the restriction. The crew removed the scraper and sent the back down hole. It passed the restriction and continued the run with no further problems.

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Challenges & Results
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Challenges

  • Position and set a whipstock to avoid hitting casing collars while milling a casing-exit window
  • Combine CCL and drift runs to save time and improve efficiency
  • Monitor and stem fluid losses due to perforations above and below the target depth

Results

  • Accurately located casing collars in real time while running in hole
  • Eliminated the need for a separate wireline CCL run
  • Controlled losses by closely monitoring ECD