An operator offshore UK was faced with a major challenge when the lower coupon of a surface lubricator valve was not captured as planned by a third-party milling company and fell downhole into the well. The operator also suspected debris accumulation downhole. When the tubing becomes packed off with particles produced from the formation, it not only has a detrimental effect on production rates but can be a symptom of a larger issue. Removing this debris becomes imperative to a healthy well operation; leaving it too long will require a much more intrusive workover to restore production. To remedy the situation, the operator asked Schlumberger Fishing Services to help retrieve the dropped valve coupon and remove any other debris from the well.
The second part of the solution involved the ReSOLVE instrumented wireline intervention service, which includes an active debris removal tool that maximizes the success and versatility of any cleanup operation. The active debris removal tool does not require additional pumping of fluid because localized well fluid circulation generated downhole collects debris into a bailer for capture.
Deploying the tool on instrumented wireline provides pinpoint depth control combined with surface readout of the tool status and positive indication when the bailers are full. Fine-tuning the active debris removal tool enables recovering a large range of particle sizes simultaneously, while real-time feedback ensures maximum debris collection for each run.
The data output to surface lets the operator know when the active debris removal tool is near capacity or is having plugging issues. A special control module enables the built-in progressive cavity pump (PCP) to reverse direction and jet the plugged debris from the collection nozzle to loosen particles for easier collection.