First conveyance of perforation system offshore
Depth8,159 ft (2,487 m)
To achieve the isolation of the bottom interval, the client requested the setting of a bridge plug and the perforation of 58 meters of liner in the horizontal section.
In turn, this should increase oil recovery in the neighboring well and be the more economical option in comparison to a well kill and tubing conveyed perforating, which had also been considered.
With the perforation system being unique to the region, this job represented the first time that Welltec would convey a perforation gun with an inductor-based detonator on an offshore platform. Therefore, testing was essential in order to perform the operation.
A number of system integration tests (SIT) were carried out in order to establish the correct equipment and setup of the shooting panel, inductor-based detonator, wireline cable and 218 Well Tractor®. Following successful testing, equipment was mobilized.
Prior to perforation operations, cleaning was performed using the Well Cleaner® Reverse Circulating Bit (RCB (with brush)). Over six runs, the 218 Well Tractor successfully conveyed the 2” perforation guns to total depth (TD).
A fast response made this task feasible, and with the water producing interval isolated, the water cut was decreased and well production optimized.
The Well Tractor was regarded as a revolution in the industry when it was introduced in the 1990’s. It enables operators to extend the reach of traditional e-line deployment into highly deviated and horizontal wells.
The Well Cleaner Reverse Circulating Bit (RCB) integrates a rotary bit with a suction system to provide the combined benefits of both in one tool. This design breaks through hard packed debris and recovers the cuttings into the integrated bailers.