Contributor Since 2009
A hydraulic fracture stimulation of Arrowsmith-2 and cleanup has now been completed, with the Irwin River Coal Measures (OTC:IRCM) zone now plugged back.
Operations currently are underway to perform hydraulic fracture stimulation on Stages 3 & 4 of the program, the Carynginia Formation.
Clearly, Norwest has achieved a proof of concept achieving gas flows from Arrowsmith-2.
The company said during seven days of flow back however, it became apparent that this zone would require further clean up time in order to fully establish gas performance.
In reviewing the first two stages of this program, it seems that gas break through occurs very quickly post stimulation, however an increase in gas rate does not occur until high water recoveries are achieved.
On Stage One, 40% water recovery was achieved within the first 12 hours, with the flare igniting 12 hours after opening the well, and a stabilised gas rate of 777Mscf/d recorded after 10 days.
On Stage Two, just 13% of water recovery was achieved within the first 24 hours, with the flare igniting six hours after opening the well, however only low water production rates were measured over subsequent days of flow back, with no significant increase in gas production.
Norwest said that all indications are that a much longer period of flow back will be required to establish increased fluid recovery and gas rates from the IRCM formation.
Norwest is now preparing for Stages 3 & 4 of the hydraulic fracture stimulation program - the Carynginia Formation. Two intervals will be fracced within the Carynginia, the Lower Carynginia (2890 - 2940m) and the Middle Carynginia (2824 - 2875m).
Each of these two intervals will be fracced separately, and then flowed back together, with diagnostics used to identify the source of flow back at surface.
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