Valeura Energy Inc., Calgary, and partner Equinor announced positive results from a natural gas flow test involving a second simulated zone in the Inanli-1 appraisal well in the Thrace basin in northwest Turkey where the firms are appraising an unconventional gas accumulation play.
Based on positive first test results in August, Valeura added a test zone to the Inanli-1 work program. While Valeura has produced gas from shallow reservoirs in the Thrace basin, the region has experienced only limited exploration for unconventional gas (OGJ, Aug. 5, 2019, p. 32.)
Crews targeted an interval at 4,176-4,217 m, which was slightly shallower than the first zone, to determine gas flow potential and fluid characteristics from rock in the same general stratigraphic unit as the first test. The second test involved a zone interpreted to be of lower reservoir quality.
The reservoir stimulation involved 15 tonnes of proppant. Once gas flowed up the casing for several hours, production tubing and artificial lift were installed to assist in cleaning up the well.
The well flowed for 4 days at an average net gas rate of 185 Mcfd. The rate for the final 24 hr of flow was 130 Mcfd. The fluid characteristics from this interval were similar to the first zone with a condensate-gas ratio of less than 10 bbl/MMcf.
Water production was minimal with an average of 4 b/d for the final 24 hr.
Valeura considers these results encouraging given the ability to flow gas from what was interpreted to be a lower quality reservoir section. They also confirmed low-water rates associated with gas production at these depths.
Crews are preparing the well for stimulation and testing of a third zone. Testing in Inanli-1 is expected to extend into the fourth quarter with Equinor financing all tests.
Contact Paula Dittrick at [email protected].
