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Australia: Vintage Energy reports strong gas flow during flow-back at the Vali-1 ST1 well

06 Aug 2020

  • Strong gas flow during flow-back of stimulation fluids
  • Flow test operations expected to commence in the next few days
  • Independently certified gross 2C Contingent Resource of 37.7 Bcf (18.8 Bcf Net)
Photo - see caption

The ATP 2021 joint venture (Vintage Energy 50% and operator, Metgasco 25% and Bridgeport (Cooper Basin) 25%) has advised that a strong gas flare has been observed over the flow-back of stimulation fluid ahead of the flow testing of  the well. The gas stream was diverted through a separator with the rate steadily increasing over the flow-back period. Recovery of the injected stimulation fluids has reached approx. 40%, with the gas rate reaching 3.7 MMscfd through a 38/64 inch choke at a wellhead pressure of 800psi. These early indications bode well for gas rates as the JV will be increasing the choke size during the upcoming flow testing program.

Photo - see caption
Vintage Energy reports strong gas flow during flow-back at the Vali-1 ST1 well

Vintage Managing Director, Neil Gibbins, said:

'To see these good early gas rates and high well head pressure while flowing stimulation fluid back is highly encouraging, vindicating our optimism about the potential of this gas field. With the flare observed to date, and the successful clean-up of the well, we are looking forward to what will hopefully be very promising results from the Vali-1 ST1 flow test.'

Photo - see caption
Location of Vali-1 well (Source: Vintage Energy)

As previously advised to the ASX (refer to ASX release of 27July2020) the six-stage fracture stimulation program for the Vali-1 ST1 well was safely completed, with one stage in the deeper Tirrawarra Sandstone and five stages in the Patchawarra Formation. Once completed, the plugs separating the various target zones were milled out to allow the well to flow. We anticipate flow testing operations will commence around 10 August once sufficient flow back of stimulation fluids has been achieved.

During testing activities, a Production Logging Tool will be run into the hole to determine the gas contribution of each of the stimulated zones. The well will then be cycled through equal periods of shut-in and flow at various flow rates. This will be followed by an extended flow test of around two days, during which time gas samples will be taken at stable gas flow conditions. The gas samples will then be sent to a laboratory foraccurate analysis of the composition of the gas. Once samples have been taken, the well will be shut-in to observe the pressure response of the reservoir. This sequence of testing events will allow us to estimate the potential flow rate for the Vali-1ST1 well and volume of gas within the Vali Field.

All of this information will be assessed and incorporated into a commercialisation plan for the asset, which will include an estimate of the number of development wells required to maximise returns from the Vali Field.

Original article link

Source: Vintage Energy

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