Statoil mulls Norwegian Sea development

Norway's Den norske stats oljeselskap AS (Statoil) has disclosed test results of a well drilled in Tyrihans North discovery in the Norwegian Sea and outlined development options. Tyrihans North and Tyrihans South discoveries lie mainly on Block 6407/1 and were discovered by Statoil in 1983 and 1982, respectively. Water depth in the area is about 325 m. The 6407/1-4 appraisal well was drilled to 3,805 m TD by Byford Dolphin semisubmersible rig. The well was intended to show the extent of

Sept. 16, 1996

2 min read

Norway's Den norske stats oljeselskap AS (Statoil) has disclosed test results of a well drilled in Tyrihans North discovery in the Norwegian Sea and outlined development options.

Tyrihans North and Tyrihans South discoveries lie mainly on Block 6407/1 and were discovered by Statoil in 1983 and 1982, respectively. Water depth in the area is about 325 m.

The 6407/1-4 appraisal well was drilled to 3,805 m TD by Byford Dolphin semisubmersible rig. The well was intended to show the extent of Tyrihans North and to confirm reserves estimates.

The well found oil and gas, with a test carried out on the oil pay. The well flowed 1,572 b/d of oil through a 1/2 in. choke.

Statoil estimates combined reserves of the two finds at 95-125 million bbl of oil and 920 bcf of gas, split roughly equally.

Statoil has set up a team to study feasibility of developing Tyrihans and aims to submit a plan for development and operation in spring 1997.

A Statoil official said no more appraisal drilling is planned, but the team will update reservoir models in the light of new data from the latest well. Reserves estimates are not expected to change significantly in the light of the new data.

Two development plans are under consideration: a stand-alone floater and a subsea development tied back to the Aasgard gas production semisubmersible, which is to be installed northwest of Tyrihans.

Tyrihans license partners are operator Statoil 50%, Total Norge AS 33.33%, and Norsk Hydro AS 16.67%.