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Snorre life extension studied
Posted 20.04.2012 11:44:41 av John Bradbury
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A new fixed platform, a floating facility or even more subsea wells are among the options being considered by Statoil to extend the life of its ageing Snorre field.

Statoil is due to make a decision this summer on its preferred concept with either a jacket-based platform and a floater – possibly a Tension Leg Platform – being weighed against one another, Glenn Stangeland writes. These two concepts will have to compete with a subsea solution, before a final concept choice which is due to be made this autumn.

“We have identified many small drilling targets, and we are therefore considering options to expand drilling capacity,”  explained Stein Rune Jakobsen, Statoil's manager for the Snorre 2040 project, speaking during a conference titled “Business Opportunities and challenges in mature fields,” taking place in Stavanger. “Snorre is a relatively slow producing field, requiring many wells,” Jakobsen has told conference delegates.

“It's obviously cheaper to drill wells from a platform than from a subsea system. But the investment is high, and everything boils down to economics,” he explained.

Any new platform would be installed in addition to the existing Snorre A and B facilities, and would not replace them, conference delegates have heard, as Jakobsen said a big investment has already been made to prepare the existing platforms for long lives.

Currently about 34% of the Snorre reservoir reserves have been produced and Statoil aims to lift the recovery rate to 46%, with a stretch target of 55%, which would represent up to300 million barrels of additional oil recovery.  Statoil believes that the solution lies in better understanding of reservoirs, EOR, gas and water injection and extended life of the field

A permanent seismic installation at Snorre is one idea on the table, Jakobsen says. We [are] considering, among other things, a solution with permanent seismic on the seabed. But then the location of the cables is a challenge because we do not really know what is going down there, for example, [with future subsea structures,” he points out.

Meanwhile construction group Ramboll has already been awarded a contract by Petoro to build a new Snorre wellhead platform. “This is Petoro's initiative, not the license´s,” Jakobsen says. “But it is an initiative we appreciate. More studies are for the good of the field,” he adds.



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