Offshore U.K. Appraisal Well Hits 9.4-m Reservoir Interval At Colter Prospect

Drilling Activity Details


United Kingdom

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Drilling Activity Summary


An offshore U.K. Colter Prospect appraisal well, #98/11a-6, was drilled by Corillian Energy Ltd., and it encountered a 9.4-m reservoir interval in Sherwood Sandstone. The well is an appraisal of #98/11-3, which was originally completed in 1986 within the Colter Prospect. The #98/11a-6 well was drilled to 1,870 m on the southern side of the Colter Prospect bounding fault, and it encountered oil and gas at the top of the reservoir. A petrophysical evaluation of logging-while-drilling data has calculated a net pay of 3 m and similar indications of oil and gas were encountered in #98/11-1 well within the Colter South fault terrace. Analysis of the new data indicates that the two wells may share a common oil-water contact in the down-dip margin of the Colter South Prospect. Corallian’s most recent assessment of the Colter South Prospect prior to drilling appraisal had estimated a mean recoverable volume of 15 MMbbl. A sidetrack to #98/11a-6 is planned and will be drilled directionally to a Sherwood Sandstone target within the Colter Prospect on the northern side of the bounding fault. Gloucestershire, U.K.-based Corillian is the operator of P1918 and the Colter wells with 57% interest, in partnership with Corfe Energy (25%), UOG Colter (10%) and Baron Oil (8%).