When two wellbore barriers are set in close proximity it is difficult to determine if the upper barrier plug is holding pressure. Measuring the liquid volume pumped to achieve the pressure test does not always provide adequate assurance.
The wireless Barrier Verification System (BVS) was developed to meet the demand for barrier plug integrity assurance. The system consists of a pressure sensor with a transmitter attached below the barrier plug. A Receiver is mounted on top of the installation tool to wirelessly record the pressure measurements below the plug. An additional pressure sensor forms part of the receiver to provide an accurate reference pressure measurement above the plug.
The transmitter sends pressure readings and can record for multiple days depending on battery selection, wellbore temperature and logging frequency. The Receiver also records and stores the reference pressure information collected above and wirelessly from below the barrier plug.
For Slickline conveyance, the system will be configured for readout of the memory after the Receiver is retrieved. Real-time readout to surface is an option when used on E-line.
The wireless BVS system was first used in the Norwegian Continental Shelf (NCS), mounted on a 5.5? Medium Expansion (ME) Retrievable Bridge Plug, and on an 3.5? Electronic Setting Tool (EST).
Following the setting of the barrier plug, it was pressure tested from above. The graph showed a differential pressure across the barrier plug which verified and provided assurance that the plug was holding pressure (Pressure above ~ 450 Bar and pressure below ~ 230 bar).
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