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An operator in the Gulf of Mexico was attempting to decomplete a well due to a failed gravel-pack completion. The production tubing had sanded up, requiring the well to be shut in for a workover operation.

The xSight™ smart intervention optimization service was used in three separate runs to clean out the production sand, monitor torque while engaging and retrieving seals, and maximize jar efficiency.

The first xSight service application on this job was to monitor weight on bit (WOB), reactive torque, and differential pressure while running a 21 /8-in. mud motor to clean out fill inside the gravel pack. Because of the extreme depth and deviation of this well and the sensitivity of the mud motor, this operation would not have been successful without the ability to precisely monitor downhole parameters. Maximum WOB for the mud motor was limited to 3,375 lbf (15,012 N). Surface readings were inaccurate for less than 50,000 lbf (222,400 N).

The xSight service was also used to successfully retrieve the seal assembly inside the gravel-pack packer. By using the real-time WOB and torque data provided, the fishing supervisor was able to successfully screw a small Acme thread on the retrieving tool into the seal assembly at 20,971 ft (6,391 m) measured depth. After screwing into the seals, data collected by the xSight service assisted the process of jarring the seals free by monitoring overpull to reduce the risk of exceeding jar limitations. After jarring the seals free, the xSight service verified the light, 488-lb (221-kg) fish weight before pulling out of hole.

Real-time data was also used to successfully retrieve the gravel-pack packer assembly. This operation took advantage of the service’s WOB measurements while latching into the packer to observe shearing inside the retrieving tool that would be difficult to see with surface readings alone.

Download the PDF to read the full case study.

 

Challenges & Results
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Challenges

  • Recover packer and seals from a sanded-in, failed gravel-pack completion
  • Screw the retrieval assembly into a small, Acme thread at 20,971 ft in an offshore well with a 45° deviation

Results

  • Reduced risks and optimized cleanout operation with 21 /8-in. workover motor
  • Increased efficiency with real-time downhole visibility
  • Maximized jarring potential on deep, highly deviated well
  • Eliminated time and cost needed to string up more rig lines