ID: 261
OBJECTID: 261
wlbNpdidWellbore: 266
wlbName: 2/7-7
wlbHistory:

General

Well 2/7-7, was drilled to appraise the southern part of the Eldfisk structure in North Sea. The primary objective was to test the Danian Limestone, expected to be about 120 m thick.

Operations and results

Appraisal well 2/7-7 was spudded with the semi-submersible installation Ocean Viking on 2 January 1973 and drilled to TD at 3084 m in the Early Cretaceous Rødby Formation. The well was drilled with seawater and hi-vis sweeps down to 497 m and with gypsum/lignosulphonate mud from 497 m to TD. 4-6% diesel additive was used below 497 m.

The Danian Limestone was found to be highly fractured, only3 0 m thick, and yielded commercial quantities of oil and gas on one drill stem test. The Late Cretaceous, which was 195 m thick, was also found to contain hydrocarbons, and yielded commercial amounts of oil and gas on two out of three drill stem tests. The Danian Limestone and the upper part of the Late Cretaceous were thinner than expected due to a fault throwing Campanian on Turonian rocks.

No cores were cut and no fluid samples were taken.

The well was permanently abandoned on 29 March 1973 as an oil appraisal.

Testing

Four intervals in the chalk section were perforated and tested

DST's 1 and 2 tested the interval 2911 to 2925. The interval gave a weak flow with headed oil + gas. The oil gravity was measured to 36.2 °API.

DST 3 tested the interval 2838 to 2905 m. The interval produced after acidiz
wlbHistoryDateUpdated: 2016-07-06T00:00:00