Wireline Logging While Fishing (LWF)
Description
The Wireline Logging While Fishing (LWF) system is an advanced contingency solution designed to maintain logging operations when a wireline cable or toolstring becomes stuck in the wellbore. Instead of stopping operations and running a separate pipe-conveyed logging job, the LWF system converts the fishing operation itself into a fully functional logging deployment. Using key components such as the Side Entry Sub (SES), Cable Cutter Sub (CCS), high-strength torpedo adapter, and dedicated sheave wheels, the system allows the toolstring to remain powered and operational during strip-over fishing. This enables real-time monitoring of the fish latching process and the acquisition of logging data both above and below the stuck depth. The system significantly reduces non-productive time by eliminating additional logging runs. It also enhances operational safety by providing controlled cable management and well control features, including cable cutting and sealing capabilities. The LWF system is compatible with standard wireline tools and drillpipe operations. Overall, it delivers substantial cost savings, improved efficiency, and increased operational flexibility in complex well intervention scenarios
Features
key features of the Wireline Logging While Fishing (LWF) system:
Side Entry Sub (SES) enabling drillpipe deployment over a live wireline while maintaining pressure control and cable access.
Cable Cutter Sub (CCS) designed to safely cut the wireline regardless of cable strength or condition when cable removal is required.
High-strength torpedo connection ensuring reliable mechanical connection and electrical continuity between cable sections.
Continuous tool power and data transmission during fishing operations, allowing real-time logging above and below the stuck depth.
Built-in well control capability, including SES ball valve sealing after cable removal to support safe operations in stuck-pipe or well-control scenarios
Benefits
* Eliminates the need for an additional logging run, reducing non-productive time and operational costs by combining fishing and logging in a single operation.
* Enables real-time logging above and below the stuck depth, allowing full data acquisition even during a stuck tool or cable scenario.
* Improves operational safety, with controlled cable handling, integrated cable cutting, and sealing features to manage well control risks.
* Maintains tool power and functionality during fishing, ensuring continuous monitoring of the fish latching and recovery process.
* Increases operational efficiency and flexibility, by converting a strip-over fishing operation into a pipe-conveyed logging equivalent without re-rigging.
