Australia's Norwest Energy NL reported Friday that flow back operations are continuing at the Arrowsmith‐2 shale gas evaluation well located in EP413 in the onshore Perth Basin, Western Australia.
Since recommencing flow back operations Sept. 18 and following the initial maximum constrained gas flow rate of 3.5 million standard cubic feet per day (MMscf/d), the well has continued to flow gas and unload stimulation fluids to surface.
After the first 24 hours of initial flow, where the rate dropped from a maximum rate of 3.5 MMscf/d to ~0.8 MMscf/d, the average rate from 16:30 hrs Sept. 19 to 6:00 hrs Oct. 17 is ~ 315,000 scf/d. The fluid production rates have averaged 748 barrels/MMscf for this same time period with current fluid rates at ~ 665 barrels/MMscf. The total fluid produced throughout the flow back period to date is 7,320 barrels (includes the first 24 hours), with an estimated 9,055 barrels introduced stimulation fluids remaining in the well.
It is intended to continue flowing back the well in the short term to conduct additional gas and fluid tests and analysis. Once it is determined that the maximum additional information has been obtained the well will be shut in to rebuild pressure. During this time, based on the analysis of the data obtained, a forward plan will be proposed.
Four stages are being flowed back in the completion program; the High Cliff Sandstone, the Irwin River Coal Measures and the Carynginia Formation (two frac stages). All zones are being comingled during flow back to achieve a composite gas flow rate. The overall completion program is planned to be conducted over a period of up to three months.
Joint Venture partners in EP413:
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