Vintage Energy has begun flow testing its Odin-1 exploration well in the Cooper Basin to assess its potential to deliver conventional gas from the Toolachee and Epsilon formations.
The primary objectives of flow testing is to assess gas flow rates from the Toolachee and Epsilon formations, provide gas and liquid samples and determine production rates from individual sands. Bottom hole pressure data will also be obtained to analyse the average reservoir properties.
The Odin-1 well was drilled in May and discovered extensive gas reservoirs in multiple formations, principally in the primary target Toolachee and Patchawarra formations and the basal Epsilon formation.
A wireline program confirmed these formations as gas pay zones have the potential for commercial gas production with high-quality gas samples recovered from all zones.
The data is intended to help determine the best reservoir to target for initial production – whether that be Toolachee, Epsilon, Patchawarra, or a combination of all three.
Vintage reported that positive test results will also assist the next steps in the field commercialisation process and enable the conversion of gas contingent resources to reserves.
According to Vintage, the Toolachee and Epsilon formations are interpreted to be more productive in terms of reservoir quality when compared with the deeper Patchawarra formation (which typically requires fracture stimulation) and a successful flow test will validate the company’s approach to perforate these formations first.
The company said it would likely fracture stimulate the Patchawarra formation “later in the well’s life” to access additional gas volumes, with the choice to defer this work expected to “substantially” reduce initial capex and increase value over the early life of the field by focusing on the potentially higher quality shallower sandstones.
The flow testing of the Epsilon and Toolachee formations in Odin-1 will assess gas deliverability from these key formations, provide reservoir fluid samples to assist with the design of well and production facilities, determine contribution and fluid type from the formations and determine the average reservoir properties using bottom hole pressure data.
The Odin-1 well lies close to the South Australian border to Queensland, about five kilometres northeast of the Beckler and Bow Permian gas fields and about six kilometres to the west of the Vali Field.
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