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Testing underway at Romanian gas well for ADX

As ADX Energy edges closer to production at its Iecea Mica-1 gas well in Romania, flow testing operations are underway again with gas recorded at surface after recovering acid which was pumped downhole to clean up and stimulate the reservoir formation. After 12 hours of flow-back operations, the well has been shut in to monitor the pressure build-up from the gas-filled reservoir sands.

ADX is back in the field chasing gas production from the paydirt it tagged when the well was originally drilled after manufacturing the necessary downhole production equipment and waiting out a period of COVID-inspired border closures and travel restrictions.

The company said its crew and equipment arrived on site last week and after rigging up the new equipment, it has now pumped the acid and associated brine down the well using a coiled tubing unit. The well was circulated with nitrogen to enable the lifting and recovery of the brine, acid and “sludge”, a technical term for the reservoir fines and chemical precipitation materials formed by the acidisation process.

The company said gas flows were observed at surface after 12 hours of flow back of the acidisation fluids and the well has now been shut in to monitor the build-up of reservoir pressure ahead of the clean-up of the well. The sludge will also be analysed to determine its composition and assess the performance and outcome of the acidisation process.

ADX hit three gas-filled pay zones in the target horizon at Iecea Mica with good porosity for gas storage capacity and high permeability for potentially commercial flow rates. The current testing program targeted the PA IV zone as the best of the three zones for flow testing. This zone is a proven gas reservoir across the basin and has the greatest upside potential, according to ADX.

Despite downhole gauges returning pressures of 200 bar, indicating the potential for commercial production flows, flows from the well were restricted due to the expected minor damage of the PA IV reservoir sands immediately surrounding the Iecea Mica-1 well bore. The reservoir sandstone often has calcium carbonate cements within it which can hinder gas flows but are soluble when acid is applied to the rock.

Whilst the ADX ground is encircled with gas fields, increased demand and restricted supply have driven gas prices to almost double in recent months as more high-cost producers have been forced to shut down.

With ADX’s program now back on track and gaining momentum, rising gas prices could well underpin the company’s development program. It is also conceivable that ADX will look to add the other gas pay zones either side of the PA IV zone, once flow testing of the primary zone is complete.

More to come….

Is your ASX listed company doing something interesting? Contact: matt.birney@wanews.com.au

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