Sean

The Sean fields were initially developed as a ‘Peak Shaver’ facility, involving high deliverability demands for relatively short periods of time – typically during the winter months. Over the course of the 25–year Peak Shaver contract, Sean produced up to 20 days per year. In 2011 the field went into ‘normal’ blow–down production. 

The development consists of three platforms. The main facility, Sean Papa, consists of two bridge linked platforms over the Sean South field (PD and PP). Sean Papa features a gas treatment facility consisting of sand separation, dehydration, and compression, with gas exported to the Shell-operated Bacton Terminal. The unmanned Sean Romeo wellhead platform (RD) is located over Sean North, and comprises wells to the Sean East and Sean North fields. The Sean Romeo satellite is tied back to Sean Papa, 

ONE-Dyas has upgraded the field’s production facilities to reduce operational costs, maintain integrity, increase safety, and reduce environmental impact.

Installing a booster multiphase pump in the well stream has reduced the wellhead pressure and increased the reservoir’s ultimate recovery. Based on extensive subsurface modelling work, we also drilled an infill production well in the existing reservoir to increase the field life by several years. And a third compression stage on the export compressor is designed to lower suction pressures, extend the production, and increase recovery.

We encourage our people to embrace innovation, think out of the box, and propose new initiatives to improve operations.

One ground-breaking idea involved mooring the Emergency Standby Vessel to a mooring buoy as often possible, instead of holding position under power. The shift reduced fuel consumption, lowered emissions, and decreased vessel maintenance – all without jeopardising the vessel’s primary emergency stand-by function. The achievement was recognised with a prestigious EEEGR Innovation Award 2017.

An established Health, Safety and Environment Management System (HSEMS) defines, measures, and controls all operational processes and activities at both a corporate and a subsidiary level.

The HSEMS is certified to ISO 14001 for Environmental Management Systems and ISO 45001 for Health and Safety Management. Certification requires an ongoing commitment to compliance with all relevant legislation, while continually improving safety and environmental performance. The scope covers all aspects of operations, with the standards re-certified by the DNV on an annual basis.

All corporate policies and procedures are directly applicable for the UK operations.

A number of management, control, and mitigation measures are in place to avoid or minimise the impact of a potential spill – as described in the Oil Pollution Emergency Plan. 

Finally, the Sean platform operates in compliance with a number of OPRED environmental permits covering air and water emissions.