First appraisal well drilled successfully at Winterfell discovery

The Winterfell-2 well (Kosmos working interest ~16.4%), was drilled to evaluate the adjacent fault block to the northwest of the original Winterfell discovery and was designed to test two horizons that were oil bearing in the Winterfell-1 well, with an exploration tail into a deeper horizon.

The well discovered approximately 40 m (~120 ft) of net oil pay in the first and second horizons with better oil saturation and porosity than pre-drill expectations. The exploration tail has discovered an additional oil-bearing horizon in a deeper reservoir which is also prospective in the blocks immediately to the north. The results of this appraisal well further define the resource potential in the central Winterfell area, with the current estimate around 100 million barrels gross.

The Winterfell-2 well is located in approximately 1600 m (~5800 ft) of water and was drilled to a total depth of approximately 8700 m (~28 500 ft). An affiliate of Beacon Offshore Energy LLC is operator of the Winterfell-2 well. Additional interest owners include Red Willow Offshore LLC, Ridgewood Monarch North LLC, CSL Exploration, LP, CL&F Offshore LLC, Houston Energy, L.P., Beacon Offshore Energy Exploration LLC, and Beacon Asset Holdings LLC.

Andrew G. Inglis, Kosmos Energy’s chairman and CEO said: “The positive result from Winterfell-2 appraisal well demonstrates the greater potential in the Winterfell area. The well results are encouraging and provide the support needed to advance a low-cost, lower-carbon development scheme that could be brought online in around two years.”

Separately, Kosmos has farmed down an interest in the two blocks immediately to the north of the Winterfell discovery to the owners of the central Winterfell discovery in exchange for cash consideration and the retention of an overriding royalty interest. This aligns the partnership and provides the ability to further scale the development with low-risk follow-on drilling. Kosmos will retain a 35% working interest in the two blocks, which have been significantly de-risked following the results of the Winterfell-1 and Winterfell-2 wells. The Winterfell complex is located within tie back distance to several existing and planned host facilities and the partnership is working to define the development plan.

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