Ascent Resources plc | Operations
Operations for Ascent Resources plc. We are the operator of the Petišovci Project in Slovenia, located on the borders with Hungary and Croatia.
Ascent, ascent resources, ascent resources plc, gas, oil, exploration, production, AIM, Petišovci Project, Slovenia
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Petišovci Project, Slovenia

Ascent is the Operator of the Petišovci Project which lies in the north-eastern corner of Slovenia on the borders with Hungary and Croatia.

Ascent holds a 75% interest in the Petišovci Project and its Joint Venture (“JV”) partner Geoenergo holds the remaining 25%. The current concession was awarded to Geoenergo in 2002 and is due for renewal in 2022.

Ascent has been involved in the project since 2007 and has spent almost €50 million to the end of 2017. Ascent is liable for 100% of the costs and will receive 90% of the revenues until all costs are recovered.

Following a 3D seismic survey of the area in 2009, two wells, Pg-10 and Pg-11, were drilled in 2010/2011. Pg-11 was side-tracked for technical reasons, becoming Pg-11A.

These wells demonstrated that gas could be flowed in commercial volumes from previously unproduced (Pg-10) and previously undiscovered (Pg-11A) reservoirs. RPS energy performed an independent volumetric assessment of the field and verified P50 contingent gas resources of 456 Bcf.

Development of the field and bringing gas to market is taking place in two phases.

Tuesday 15th January – Ascent Resources, the AIM listed Oil and Gas exploration and production company focused on Slovenia and Central Europe, is pleased to provide the following update on strategic direction, current operations in Slovenia, and changes to the Board and management of the Company.

YearTypeFile NameViewDownload
2017Company Fact Sheet
2011Petišovci Commerciality Report

Phase One: Export untreated gas to Croatia

  • Recomplete wells Pg-10 and Pg-11A for production
  • Construct flow lines
  • Refurbish existing processing equipment
  • Install metering & pigging station
  • Recertify existing export pipeline
  • Sell untreated gas from Pg-10 and Pg-11A

Production to a local industrial customer began in April 2017 and export production to INA, Croatia’s leading oil and gas company, began in November 2017. Phase 1 is now complete.

Phase Two: Developing the field and selling gas into the Slovenian national grid

  • Increase production from Pg-10 and Pg-11A
  • Re-enter and deepen 9 existing wells – permitting programme under way
  • Drill infill wells
  • Build a processing plant to treat the gas for injection into the Slovenian national gas network achieving the highest possible price – IPPC permit due soon from Slovenian Environment Agency

Further information can be found in the Reports and Presentations on this page. Please see our RNS News & Alerts page for operational updates.


interest in project


depth drilled



8.8 MMscf

test result

3D Seismic Survey

In 2009 we initiated the acquisition of an extensive 3D seismic survey across the Petišovci area. This was the first ever 3D seismic acquired in Slovenia and the permitting for this required the agreement of over 10,000 landowners.

Interpretation of the seismic data provided a greater insight into the field structure and indicated zones of potentially better reservoir quality. The structure has two sets of reservoirs, the shallower Upper Miocene and the deeper Middle and Lower Miocene. The deeper Miocene reservoirs are Ascent’s main development objective.  The shallower reservoirs were developed during the 1960s and in the future we propose to experiment with modern, enhanced, oil recovery techniques to attempt to recover the remaining reserves.

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