Tuesday, November 26, 2013

ON THE DISPOSAL OF PRODUCED WATER FROM COAL SEAM GAS PRODUCTION – A CASE STUDY, GLOUCESTER NSW

by Philip J Pells FTSE, DSc

IMG 9831 Gloucester area
AGL Property at Tiedimans Road Forbesdale

1.             INTRODUCTION


This note deals with the proposal for disposal of produced water in the approved Stage 1 Coal Seam Gas (CSG) project at Gloucester, NSW. Details of the project are available on the Australian Gas Light Company (AGL) website and are not repeated here. The location of the 110 well Stage 1 project is shown in Figure 1.


Figure 1: AGL Exploration lease in yellow and Stage 1 in red outline.



The extent of groundwater investigations within the Stage 1 area, as provided by AGL is shown in Figure 2.


Figure 2: AGL groundwater investigations (AGL Industry Briefing 14 Nov 2011 as cited on AGL website May 2013)




2.               PROPOSED DISPOSAL OF PRODUCED WATER


At a presentation to a public meeting at Gloucester on 16 May 2013, a manager of AGL, Mr Mike Moraza, stated that salt from produced water would not be removed from site to the Taree waste disposal facility, as had previously been documented by AGL.  Also Mr John Ross of AGL stated that produced water would not be disposed into the Avon River.

Mr Ross stated that it was intended that the produced water would be diluted and used for irrigation in accordance with a trial that is detailed on the AGL website, reproduced below:

“AGL has initiated a produced water irrigation trial on its Tiedmans property that will involve the reuse of up to 70 ML of produced water over separate areas within the Stage 1A/1B areas. Most water is to be blended and irrigated over an intensively monitored 12ha area”


IMG 9842
On the road winding into GLOUCESTER, the place is beautiful!
 
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