Beneficial use of associated water in the Queensland coal seam gas industry*

Abstract

The Queensland Government has developed an associated water management policy that, among other things, strives to maximise the beneficial use of associated water derived from Queensland’s burgeoning coal seam gas industry.

The Department of Infrastructure and Planning reports that domestic gas production alone (i.e. without an export LNG market) will produce on average 25 GL per annum in the next 25 years. Most of this water has sufficiently high total dissolved solids and other water quality issues to require some form of treatment prior to use. Clearly, the relatively large volumes of water present both challenges and opportunities to the communities in which the CSG industry is developing.

In line with the philosophy of beneficial use of associated water, Santos has developed a portfolio of options within its associated water management strategy and plans for its Arcadia Valley, Fairview and Roma tenements.

The strategy seeks to:

1. provide enduring value for the community;

2. maximise benefits while minimising the environmental footprint;

3. provide a range of alternatives to avoid single-mode failure;

4. use scalable options in response to uncertainty;

5. deploy demonstrated technologies; and,

6. meet and exceed all regulatory requirements.

This paper will set some context around the broader CSG industry’s associated water challenges, and identify what parameters must be considered in arriving at beneficial uses for the water. The paper then explores some of Santos’ approaches to associated water management.