The AT-13 appraisal well penetrated 73 m of gas, condensate-bearing Ordovician formation in Algeria’s Ain Tsila development (OGJ Online, Sep. 25, 2014). Petroceltic International PLC reported on May 23 that its latest appraisal well is the second in a campaign of as many as 24 development wells. The AT-13 is north of the field, 1.8 km from the AT-8 well, and 6.1 km from the original discovery well AT-1 (OGJ Online, Aug. 4, 2009).
The field is part of the Isarene production-sharing contract in the Illizi basin in eastarn Algeria. The initial agreement, signed in August 2012, called for 18 vertical wells to produce a combined 355 MMscfd of wet gas during a 14-year plateau to the new gas processing plant (OGJ Online, Aug. 14, 2012). A further 106 development wells were estimated to be needed to maintain the plateau.
The well was spudded on Apr. 20 and reached TD of 2,220 m on May 14. Wireline logging results indicate good reservoir quality similar to that encountered in AT-8, the company said.
Test results will be confirmed later in 2016 in a planned batch completion. The Sinopec rig will move to the AT-11 development well, which is 4.2 km north of AT-8 and 1.8 km from the AT-1. The AT-11 will target the Ordovician at a planned MD of 2,050 m.
Petroceltic holds a 38.25% interest, Sonatrach a 43.375% interest, and Enel an 18.375% interest in the Isarene PSC. Petroceltic sold 18.375% interest to Sonatrach in July 2014.
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