The Y-tool is a solution to enable production-logging and well intervention below a working ESP at any point in time during production without pulling the completion string. The Y-tool is installed on the production tubing, providing two separate conduits. One conduit concentric with the production tubing and enables access to the reservoir below the ESP. The second conduit is offset and used to support the ESP system. Flow rates in different perforation intervals and other valuable geophysical information could be collected for production optimization and enhanced recovery plans.
With an ESP Y-tool in place, Operators are able to carry out wireline or coiled tubing logging, memory gauge deployment, tubing-conveyed perforation, well treatment and stimulation operations, effectively managing production operations and reservoir performance without pulling the ESP, dual ESP installation and bridge plug setting for water shutoff, etc.
Wireline or coiled tubing plugs can be used to seat in a nipple profile in the Y-tool to enable intervention or logging operation without retrieval of the completion. If required, the ESP can be run with these plugs in place to perform production logging or other well interventions.
Installation of the production string with the Y-tool to bypass the ESP with downhole
logging tools during production.
The previous figure was from an article titled ” Downhole monitoring during hydraulic experiments at the In-situ Geothermal Lab Groß Schönebeck ” illustating how Y-tool was succesfully used to perform downhole measurements, carried out during production, in order to observe the performance of the stimulated zones and the naturally occurring permeable intervals.
Y-tool installation (Courtesy Novomet)