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Exploration wellbore: 34/8-8 R

General information

Wellbore history

General

Well 34/8-8 R is a re-entry of appraisal well 34/8-8 on the N-1 segment of the 34/8-1 Visund discovery on Tampen Spur in the Northern North Sea. The primary objective of well 34/8-8R was to determine the pressure regime and pressure gradient in the hydrocarbon bearing sands in Tarbert, Ness and Etive formations. The secondary objective was to determine the fluid system/composition and the possible presence of a gas oil contact in the Tarbert/Ness formations. The third objective was to investigate the mobility of oil and water down to the interpreted free water level (FWL)

Operations and results

Well 34/8-8 was re-entered on 16 February 1993 with the semi-submersible installation Polar Pioneer.

The well was drill stem tested. No significant problems occurred in the operations.

No cores were cut and no wire line fluid samples were taken.

The well was permanently abandoned on 9 March 1993 as an oil appraisal.

Testing

Two drill stem tests were performed. In both tests production logging (PLT) was performed during the main flow.

DST 1 tested the interval 2960.2 to 2973.2 m in the Ness/Etive formations. The test sequence consisted of an initial and a cleanup flow/build-up period with down hole shut-in. The main flow with PLT was interrupted by poor weather conditions and the well was immediately killed. Only a limited amount of the surface sampling program was therefore accomplished. No down hole samples were collected. The test produced 775 Sm3 oil, 10600 Sm3 gas and 161 m3 water/day through a 12.7 mm choke in the cleanup flow. GOR was 137 Sm3/Sm3. The oil density was 0.852 g/cm3 and the gas gravity was 0.665 (air = 1) with 1.6% CO2 and 0.25 ppm H2S. Flowing BHP was 423.3 bar and flowing BHT was 112.3 deg C. The PLT results showed an effective OWC at 2971.5.

DST 2 tested the interval 2921 to 2950 in the Tarbert/Ness formations. The test sequence consisted of an initial and a cleanup flow/build-up period with down hole shut-in. After the cleanup build-up bottom hole sampling was accomplished with the well flowing on a low rate. Three out of five samples were good. The well was production logged (PLT) during the dual rate main flow period. The test produced 956 - 772 Sm3 oil, 147100 Sm3 gas and 0 m3 water/day through a 19.05 mm choke in the main flow. GOR was 164 - 191 Sm3/Sm3. The oil rate was steadily decreasing while the gas rate was relatively constant. Consequently, the GOR steadily increased during this period. The oil density was 0.844 g/cm3 and the gas gravity was 0.660 (air = 1) with 1.4% CO2 and 1.5 ppm H2S. Flowing BHP was 234.6 bar and flowing BHT was 112.4 deg C. No gas/oil contact was reported from the test.

After the main build-up with surface shut-in, a minifracture test was performed.

Cuttings available at the NPD

No cuttings in this wellbore.

Cores available at the NPD

No cores in this wellbore.

Scanned core photos

No scanned core photos available

Palynological slides available at the NPD

No palynological slides in this wellbore.

Oil samples available at the NPD

Casing and leak-off tests

Mud

Drill stem test (intervals and pressures)

Drill Stem Test (recovery)

Available logs

Lithostratigraphy

Composite log

No composite log presently available.

Geochemical information available at the NPD

No geochemical data presently available. Regional geochemical studies which include data from this well may however be filed on a different well.

Documents reported by the licencees (period for duty of secrecy expired)

No documents presently available.