The types of well that can benefit from downhole annulus safety systems (DBASS) are discussed. Platform gas lifted wells are treated in more detail because this technology is particularly appropriate to them.

The DHASS completion equipment that was available when Elf Enterprise Caledonia Ltd.(formerly Occidental Petroleum Caledonia Ltd.) first investigated its use is presented. The drawbacks of this equipment and the developments that have taken place since then due to cooperation between users and suppliers are discussed in relation to their desired features.

The types of equipment that have been selected by Elf Enterprise for its existing and new North Sea fields and some early operating history are discussed. Recommendations for additional work to further develop the systems are made.

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