Between 26 June 1956 and 28 October 1958, 11 appraisal wells were drilled vertical to appraisal the extension of the reservoir to different sections of the field.
An appraisal well Oloibiri-17 was spudded on 9 June 1967 after 9 years of production and drilled deviated to a measured depth of 12520 feet (3816 mD) but the result was not encouraging.