STRIKE Energy’s fracking operations in the Cooper basin have proved successful, with coals demonstrating exceptional permeability with very high flow potential.
Strike reported that the Le Chiffre-1 well encountered about 15 metres of net coal in the lower Patchawarra Vu seam, while 35m was delineated in the upper Patchawarra.
At the Klebb-1 well, Strike revealed that 16 metres of coal had been intersected in the lower Patchawarra seam, with 34m intersected in the upper Patchawarra.
The second stage of the fracking program at Klebb in the Patchawarra Vu upper seam redesigned to be less than 10 per cent of the size of the stage pumped in Le Chiffre as a result of the unexpectedly permeability and productivity, Strike said.
At Le Chiffre, the well began flowing back unassisted and 2,700 bbls of fluid was recovered at high flow rates (up to 5,000 bbls per day) before starting coil tubing operations.
Overall, about 5,200bbls of fluids have been produced from Le Chiffre over three days of combined flowing time. The well is currently shut in and pressure build up is being observed.
Strike said the high formation permeability and the size of the fracs pumped in Le Chiffre had resulted in very high fluid productivity from the well.
In turn, the substantial fluid inflows mean that, at this early stage, the company had yet to reduce the formation pressure sufficiently to initiate sustained gas production to surface.
Strike revealed that the coals at Le Chiffre had high permeability of up to 25 mD which, combined with between 50 metres and 60 metres of net coal thickness in each well, result in very high productivity as demonstrated by the flow rates observed.
“We had expected to encounter a low permeability reservoir system with correspondingly low productivity. These permeabilities have fundamentally altered our understanding of the reservoir system which has demonstrated exceptional deliverability capacity,” Strike said in an announcement.
While the coal’s surprisingly high permeability is viewed as very encouraging, further testing will be required to realise gas flows to surface.
The company is currently planning the next stage of testing to obtain a full understanding of the potential of the high productivity coals.