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20 Oct 2009 07:00
Petroceltic International plc
Substantially increased flow rates from AT-1 well test post fracture stimulation
Gas column in excess of 100 meters encountered in AT-2
AT-3 well brought forward
Petroceltic International plc ("Petroceltic" or "the Company"), the upstream oil and gas exploration and production company focused on North Africa and the Mediterranean, in association with its partner Sonatrach, the Algerian National Oil & Gas Company is pleased to announce that:
Continued testing on well AT-1, on the Isarene permit (Blocks 228 & 229a), Algeria, following fracture stimulation ("fracturing") has resulted in flow rates increasing substantially from those previously reported, to a maximum of 33.78 mmscf/d*.
Drilling on the AT-2 well has logged a gas column in excess of 100 metres. The Company plans to test the AT-2 well following completion of testing on the INE-2 well drilled earlier this year.
Scheduling for the drilling for the AT-3 well to delineate further the significant commercial potential of the Isarene permit has been brought forward.
Analysis of the pressure build up data from the original AT-1 well test suggested that well performance had been hampered by seepage of drilling materials into the objective reservoir during the drilling process. Mechanical fracturing of the Ordovician (Unit IV) reservoir was therefore used to bypass the zone impacted by drilling materials to obtain a more accurate analysis of the well's potential.
The pre and post fracture gas flow rates from the well are summarised below at the following Flowing Well Head Pressures ("FWHP").
Choke Pre-Fracture Stimulation Post Fracture Stimulation
setting Gas rate FWHP Gas rate FWHP
64ths" MMscf/d* PSIG** MMscf/d* PSIG**
128 11.40 205 NA NA
80 NA NA 33.78 1,464
48 9.94 897 21.96 2,025
32 7.75 1,458 12.14 2,295
*MMscf/d: Million Standard Cubic Feet per Day of gas
**PSIG: Pounds per Square Inch Gauge
At a flow rate of 33.78 mmscf/d, the wellhead pressure was 1,464 PSIG on a 80/64" choke setting, and at a rate of 12.14 mmscf/d, well head pressure was 2,295 PSIG on a 32/64" choke setting.
The maximum flow rate from the well was constrained by the pressure and volume rating of the well testing equipment available in the field, due to flow rates being in excess of expectations. Engineering estimates suggest that this well would be capable of flowing at rates in excess of 40 mmscf/d gas on a 2" (or 128/64") choke setting if adequate surface testing facilities had been available.
Testing and sampling operations at the AT-1 well have now been completed and the well testing crew is now moving to flow test well INE-2. Well AT-1 has been completed for possible future use as a production well.
The AT-1 well is the second well in the current drilling programme on the Isarene permit in the Illizi basin, Algeria. This successful post fracturing test demonstrates the potential of this process to enhance productivity in Ordovician reservoirs and further underscores the high gas potential of the Ain Tsila ridge discovery at this location. The well was drilled by Petroceltic (75% interest, Operator) in association with the Algerian Oil & Gas Company Sonatrach (25% Interest).
The AT-2 well, the second on the Ain Tsila field, has now completed drilling, and a liner has been set over the objective Ordovician formation. A gas column of in excess of 100 metres was logged and formation pressure measurements indicated that the gas observed at this location was in the same pressure regime as the gas in well AT-1.
The drilling rig will now move to the AT-3 location, which is approximately 9 km south of the AT-2 location, to continue the exploration of the Ain Tsila Ridge structure.
Brian O'Cathain, Chief Executive of Petroceltic, commented:
"The updated AT-1 result is exciting, with substantially higher flow rates that confirm the significant commercial potential of the Isarene permit to Petroceltic and our partner Sonatrach. The additional testing has given us a more accurate picture of the flow potential of this area of the Ain Tsila Ridge structure. We are also greatly encouraged by the logging of a 100 metre gas column in the AT-2 well and look forward to testing this in the near future. We have rescheduled our drilling programme, bringing the AT-3 well forward, to delineate further the extent of this potentially large discovery."
Ends
For further information, please contact:
Petroceltic
Brian O'Cathain Chief Executive Tel: +353 (1) 421 8300
Alan McGettigan Finance Director
Pelham PR
Philip Dennis Tel: +44 20 7337 1516
Klara Kaczmarek Tel: +44 20 7337 1524
Murray Consultants
Joe Murray Tel: +353 (1) 4980300
Davy
Hugh McCutcheon Tel: +353 1 6796363
John Frain
Fabrice Toussaint, Head of Petroleum Engineering, Petroceltic International plc, is the qualified person who has reviewed and approved the technical information contained in this announcement. Mr. Toussaint holds a Diploma in Engineering from the Ecole Nationale Supérieure de l'Aéronautique et de l'Espace, Toulouse, and has over 17 years experience in oil & gas exploration and production. He is a member of the Society of Petroleum Engineers.
Notes to Editors:
Petroceltic International plc is a leading Upstream Oil and Gas Exploration and Production Company, focused on the Mediterranean and North African area, and listed on the London Stock Exchange's AIM Market and the Irish Sock Exchange's IEX Market. The Company has exploration and appraisal assets in Algeria, Tunisia and Italy.
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