Statoil Spuds Well on Tyrihans South

Statoil spudded an appraisal well on the Tyrihans South find in the Norwegian Sea on September 21st. The Stena Don semisubmersible rig is carrying out the drilling, which is expected to take about one and a half months.

"We hope to prove additional oil and gas reserves on Tyrihans South," reports Knut Christian Grindstad, vice president in the Halten/Nordland exploration unit in Harstad. Gas and oil have already been proven in Tyrihans South and North respectively, in 1983 and 1984. The blocks in which these finds have been proven lie in production licenses 073 and 091, and are situated 40 kilometers south of the Asgard field. Water depth is about 285 meters. The well on Tyrihans South will be drilled to between 3,000 and 4,000 meters depth.

"We consider Tyrihans to be an Asgard satellite, and are contemplating direct subsea tie-back to existing infrastructure on Asgard," confirms Mr Grindstad.

Timing of the development will depend on available capacity in the infrastructure and the solution chosen for the sale of the gas.

Licensees in production license 091 are operator Statoil with 55 percent, Norsk Hydro with 33 percent and ExxonMobil with 12 percent. Licensees in production license 073 are operator Statoil with 54.67 percent, TotalFinaElf with 33.33 percent and Norsk Hydro with 12 percent.

Stena Don is one of the world's most modern drilling rigs. Its features include dynamic positioning, which maintains the correct position without the use of anchors. The rig arrived on Tyrihans from an operation on the Statoil operated Norne field. It will also drill the first exploration well on the Blameis structure east of the Norne field later this autumn.