Norwest Energy NL reported Friday that the flow back from the Arrowsmith‐2 well located in permit EP413, northern Perth Basin, Western Australia commenced Sept. 18.
Co‐mingled flow back was from the lower three fracture stimulated formations via the recently installed 2.375 inch tubing string completion (set at 8,677.8 feet or 2,645 meters measured depth below rotary table, or MDRT). Upon opening, the well immediately commenced unloading significant amounts of stimulation fluid with strong gas flow.
Gas and fluid rates of up to 3.523 million standard cubic feet per day (MMscf/d) and 1,100 barrels per day (bpd) respectively were measured while flowing through a 29/64 inch choke setting. These rates are the maximum that can be comfortably measured with the equipment package currently on location.
After flowing back the well for 18 hours, a second flow rate test was conducted at 10:30 hrs Sept. 19 and the well was flowing at 0.91 MMscf/d of gas and 840 bpd of fluid while flowing through a 32/64 inch choke setting.
It will take several days or more for the greater volume of stimulation fluids to flow back, and during this period gas flow rates are expected to be variable. It is anticipated that the choke will be further opened as the ratio of gas to fluid stream increases.
Peter Munachen, Norwest CEO said “We are excited by this initial gas rate particularly given the volume of stimulation fluids that remain to be flowed back. We fully expect that Arrowsmith‐2 will provide the relevant information in coming months to assist in assessing the potential development of the Arrowsmith unconventional field.”
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 co‐mingled during flow back to achieve a composite gas flow rate. To ensure the evaluation program captures as much information as possible on zonal contribution, production logging tools will be run down‐hole at various times during the flow back process.
This co‐mingled flow approach has been successfully demonstrated by a number of other operators on unconventional (vertical) well evaluation programs.
It is expected that the gas flow rate and testing program will continue for a further two to three months.
Joint Venture partners in EP413:
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