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| Sillaro
The field was originally explored by ENI between 1955 and 1982 with seven wells drilled in and around the structure. The field contains gas bearing zones in the Pliocene level at a depth of 2,100 metres. The deeper Miocene level, at a depth of 2,500 metres, was previously drilled by ENI and found to have a gas bearing reservoir.
In June 2009 the Company was granted approval to install surface plant to develop the Sillaro gas field. In July 2009, the Company drilled a second well -- Sillaro2dir -- into the Pliocene gas reservoirs, designed to produce from multiple levels and to increase overall flow rates and optimise total field recovery.
In May 2010, despite severe winter weather conditions, the field commenced production on Sillaro-2dir from levels A and E while the Sillaro-1dir well was connected in June 2010 to produce from levels C1+C2. Flow rates and pressures behaviour are in line with the start-up plan and the plant is working efficiently.
Total production for the 2010 year was 18.5 million cubic metres at an average of 83,000 cubic metres/day.
In May 2011, a 3 day shut-down permitted to record the bottom hole pressure, a critical measurement to better understand and update the reservoir behaviour. The results are encouraging and confirm the previously certified 1P (Proven) reserves of 7.5 billion cubic feet and 2P (Proven+Probable) reserves of 8.2 billion cubic feet.
In August 2011, in line with the field development plan, the Company closed the gas producing level E, which produced in excess of initial reserve estimates, and opened the level C0. Subsequent to the change in producing levels, the field re-started production at the planned rate of around 80,000scm/day. Sillaro is running smoothly, with stable plant and pressure performance.
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