bp has increased gas reinjection capacity on the Central Azeri platform and completed its first riserless light well intervention (RLWI) campaign in the Caspian Sea.

Central Azeri gas reinjection capacity increased

bp has completed the Central Azeri Gas Expansion (CAGE) project in the Azerbaijani sector of the Caspian Sea.

The program involved increasing gas reinjection capacity on the Central Azeri platform by 20%, helping to maximize recovery from existing wells.

Offshore execution started in January and concluded ahead of schedule last month. Upgrades to the platform's four gas injection compressors included replacement of compressor cartridges and auxiliary equipment.

All work took place during live platform operations, bp said, with no requirement for a plant outage or extra flaring.

In addition, the team performed modifications to compressor suction manifold piping to support the gas injection capacity increase and improve operational flexibility, all during the platform’s planned maintenance program turnaround in August.

The CAGE project is part of bp’s ongoing campaign to maximize recovery and sustain long-term production from the Azeri-Chirag-Gunashli (ACG) Field.

First Caspian riserless intervention campaign completed

In the Deepwater Gunashli area of the field, a seven-well subsea intervention program has also finished ahead of schedule, having started in fourth-quarter 2025.

For bp, it was the first deployment of RLWI technology for its Caspian region operations, in this case Oceaneering International’s subsea mechanical wireline Blue Ocean Riserless Intervention System (BORIS).

The technology provided access to the subsea wells without the need for conventional drilling risers, also providing well control, pressure containment and subsea intervention capabilities.

All activities were conducted from the subsea construction vessel Khankendi. This served as a light well intervention vessel with the RLWI system integrated onto it, representing another first for the Caspian, bp claimed.

One critical feature was the installation and first-time use of a moonpool system aboard the Khankendi, positioned near the vessel's centreline. This provided a sheltered vertical opening through the hull for safe deployment of subsea equipment, ROVs and well intervention tools to the seafloor

The intervention jobs were completed on subsea wells previously deemed hard to access using conventional intervention techniques. The campaign enabled efficient well surveillance, bp added, also helping the company to identify opportunities for reservoir pressure management and production rate enhancement on the ACG Field.