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Norwest restarts Western Australia shale gas well

Norwest Energy

Norwest Energy has restarted operations on the unconventional shale gas well, Arrowsmith-2, located in EP413, northern Perth Basin, Western Australia.

As reported in Dec. 2012, the well was shut in at the conclusion of Kockatea swabbing operations to monitor pressure build-up characteristics of the fracture stimulated zone.

As a further step in the evaluation program for Arrowsmith-2, a pressure- temperature gradient survey is currently being performed to confirm fluid interfaces in the wellbore, and to assess current reservoir pressure at the perforations.

Analysis of surface pressure and sonic fluid level data indicate the reservoir is approaching its original pressure, with positive signs the reservoir is able to recharge.

Following the discovery of both oil and gas flowing from the Kockatea Shale interval, post the hydraulic fracture stimulation in September 2012, flowback operations and a detailed monitoring and evaluation program have been ongoing. During flow back approximately 78 percent of injected fracture fluids were recovered after swabbing the well to a maximum planned depth of 8,530 feet (2,600 meters).

Data acquired from this program, and other regional oil production information will assist in providing the necessary dataset for evaluators to work towards producing a resource booking on the Kockatea Shale.

Once evaluation of the Kockatea is complete, the interval will be isolated and the plug milled out between the Kockatea Shale and the Carynginia Formation. This will enable flow back and clean up to recommence on the Carynginia interval. This work will commence as soon as the necessary equipment becomes available, currently estimated to be towards the end of this month. It is anticipated that the testing of all remaining zones will take approximately three to four months.

 

The joint venture partners in EP413 are Norwest Energy (27.945%), AWE (44.252%) and Bharat PetroResources (27.803%).

 

 

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